README.md

@@ -1,2 +0,0 @@
-# Java
-

main/java/net/micode/notes/data/Contact.java

@@ -60,7 +60,7 @@ public class Contact {
                 sContactCache.put(phoneNumber, name);
                 return name;
             } catch (IndexOutOfBoundsException e) {
-                Log.e(TAG, " Cursor get string error " + e.toString());
+                Log.e(TAG, " Cursor get string error " + e);
                 return null;
             } finally {
                 cursor.close();

main/java/net/micode/notes/data/Notes.java

@@ -66,105 +66,105 @@ public class Notes {
          * The unique ID for a row
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String ID = "_id";
+        String ID = "_id";
 
         /**
          * The parent's id for note or folder
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String PARENT_ID = "parent_id";
+        String PARENT_ID = "parent_id";
 
         /**
          * Created data for note or folder
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String CREATED_DATE = "created_date";
+        String CREATED_DATE = "created_date";
 
         /**
          * Latest modified date
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String MODIFIED_DATE = "modified_date";
+        String MODIFIED_DATE = "modified_date";
 
 
         /**
          * Alert date
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String ALERTED_DATE = "alert_date";
+        String ALERTED_DATE = "alert_date";
 
         /**
          * Folder's name or text content of note
          * <P> Type: TEXT </P>
          */
-        public static final String SNIPPET = "snippet";
+        String SNIPPET = "snippet";
 
         /**
          * Note's widget id
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String WIDGET_ID = "widget_id";
+        String WIDGET_ID = "widget_id";
 
         /**
          * Note's widget type
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String WIDGET_TYPE = "widget_type";
+        String WIDGET_TYPE = "widget_type";
 
         /**
          * Note's background color's id
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String BG_COLOR_ID = "bg_color_id";
+        String BG_COLOR_ID = "bg_color_id";
 
         /**
          * For text note, it doesn't has attachment, for multi-media
          * note, it has at least one attachment
          * <P> Type: INTEGER </P>
          */
-        public static final String HAS_ATTACHMENT = "has_attachment";
+        String HAS_ATTACHMENT = "has_attachment";
 
         /**
          * Folder's count of notes
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String NOTES_COUNT = "notes_count";
+        String NOTES_COUNT = "notes_count";
 
         /**
          * The file type: folder or note
          * <P> Type: INTEGER </P>
          */
-        public static final String TYPE = "type";
+        String TYPE = "type";
 
         /**
          * The last sync id
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String SYNC_ID = "sync_id";
+        String SYNC_ID = "sync_id";
 
         /**
          * Sign to indicate local modified or not
          * <P> Type: INTEGER </P>
          */
-        public static final String LOCAL_MODIFIED = "local_modified";
+        String LOCAL_MODIFIED = "local_modified";
 
         /**
          * Original parent id before moving into temporary folder
          * <P> Type : INTEGER </P>
          */
-        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+        String ORIGIN_PARENT_ID = "origin_parent_id";
 
         /**
          * The gtask id
          * <P> Type : TEXT </P>
          */
-        public static final String GTASK_ID = "gtask_id";
+        String GTASK_ID = "gtask_id";
 
         /**
          * The version code
          * <P> Type : INTEGER (long) </P>
          */
-        public static final String VERSION = "version";
+        String VERSION = "version";
     }
 
     public interface DataColumns {
@@ -172,73 +172,73 @@ public class Notes {
          * The unique ID for a row
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String ID = "_id";
+        String ID = "_id";
 
         /**
          * The MIME type of the item represented by this row.
          * <P> Type: Text </P>
          */
-        public static final String MIME_TYPE = "mime_type";
+        String MIME_TYPE = "mime_type";
 
         /**
          * The reference id to note that this data belongs to
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String NOTE_ID = "note_id";
+        String NOTE_ID = "note_id";
 
         /**
          * Created data for note or folder
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String CREATED_DATE = "created_date";
+        String CREATED_DATE = "created_date";
 
         /**
          * Latest modified date
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String MODIFIED_DATE = "modified_date";
+        String MODIFIED_DATE = "modified_date";
 
         /**
          * Data's content
          * <P> Type: TEXT </P>
          */
-        public static final String CONTENT = "content";
+        String CONTENT = "content";
 
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * Generic data column, the meaning is  specific, used for
          * integer data type
          * <P> Type: INTEGER </P>
          */
-        public static final String DATA1 = "data1";
+        String DATA1 = "data1";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * Generic data column, the meaning is  specific, used for
          * integer data type
          * <P> Type: INTEGER </P>
          */
-        public static final String DATA2 = "data2";
+        String DATA2 = "data2";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * Generic data column, the meaning is  specific, used for
          * TEXT data type
          * <P> Type: TEXT </P>
          */
-        public static final String DATA3 = "data3";
+        String DATA3 = "data3";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * Generic data column, the meaning is  specific, used for
          * TEXT data type
          * <P> Type: TEXT </P>
          */
-        public static final String DATA4 = "data4";
+        String DATA4 = "data4";
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * Generic data column, the meaning is  specific, used for
          * TEXT data type
          * <P> Type: TEXT </P>
          */
-        public static final String DATA5 = "data5";
+        String DATA5 = "data5";
     }
 
     public static final class TextNote implements DataColumns {

main/java/net/micode/notes/data/NotesDatabaseHelper.java

@@ -33,9 +33,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
     private static final int DB_VERSION = 4;
 
     public interface TABLE {
-        public static final String NOTE = "note";
+        String NOTE = "note";
 
-        public static final String DATA = "data";
+        String DATA = "data";
     }
 
     private static final String TAG = "NotesDatabaseHelper";

main/java/net/micode/notes/data/NotesProvider.java

@@ -73,7 +73,7 @@ public class NotesProvider extends ContentProvider {
         + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
         + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
 
-    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+    private static final String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
         + " FROM " + TABLE.NOTE
         + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
         + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
@@ -135,7 +135,7 @@ public class NotesProvider extends ContentProvider {
                     c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
                             new String[] { searchString });
                 } catch (IllegalStateException ex) {
-                    Log.e(TAG, "got exception: " + ex.toString());
+                    Log.e(TAG, "got exception: " + ex);
                 }
                 break;
             default:
@@ -159,7 +159,7 @@ public class NotesProvider extends ContentProvider {
                 if (values.containsKey(DataColumns.NOTE_ID)) {
                     noteId = values.getAsLong(DataColumns.NOTE_ID);
                 } else {
-                    Log.d(TAG, "Wrong data format without note id:" + values.toString());
+                    Log.d(TAG, "Wrong data format without note id:" + values);
                 }
                 insertedId = dataId = db.insert(TABLE.DATA, null, values);
                 break;
@@ -198,7 +198,7 @@ public class NotesProvider extends ContentProvider {
                  * ID that smaller than 0 is system folder which is not allowed to
                  * trash
                  */
-                long noteId = Long.valueOf(id);
+                long noteId = Long.parseLong(id);
                 if (noteId <= 0) {
                     break;
                 }
@@ -240,7 +240,7 @@ public class NotesProvider extends ContentProvider {
                 break;
             case URI_NOTE_ITEM:
                 id = uri.getPathSegments().get(1);
-                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
+                increaseNoteVersion(Long.parseLong(id), selection, selectionArgs);
                 count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
                         + parseSelection(selection), selectionArgs);
                 break;
@@ -283,7 +283,7 @@ public class NotesProvider extends ContentProvider {
             sql.append(" WHERE ");
         }
         if (id > 0) {
-            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+            sql.append(NoteColumns.ID + "=" + id);
         }
         if (!TextUtils.isEmpty(selection)) {
             String selectString = id > 0 ? parseSelection(selection) : selection;

main/java/net/micode/notes/gtask/data/SqlData.java

@@ -55,7 +55,7 @@ public class SqlData {
 
     public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
 
-    private ContentResolver mContentResolver;
+    private final ContentResolver mContentResolver;
 
     private boolean mIsCreate;
 
@@ -69,7 +69,7 @@ public class SqlData {
 
     private String mDataContentData3;
 
-    private ContentValues mDiffDataValues;
+    private final ContentValues mDiffDataValues;
 
     public SqlData(Context context) {
         mContentResolver = context.getContentResolver();
@@ -154,9 +154,9 @@ public class SqlData {
             mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
             Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
             try {
-                mDataId = Long.valueOf(uri.getPathSegments().get(1));
+                mDataId = Long.parseLong(uri.getPathSegments().get(1));
             } catch (NumberFormatException e) {
-                Log.e(TAG, "Get note id error :" + e.toString());
+                Log.e(TAG, "Get note id error :" + e);
                 throw new ActionFailureException("create note failed");
             }
         } else {

main/java/net/micode/notes/gtask/data/SqlNote.java

@@ -86,9 +86,9 @@ public class SqlNote {
 
     public static final int VERSION_COLUMN = 16;
 
-    private Context mContext;
+    private final Context mContext;
 
-    private ContentResolver mContentResolver;
+    private final ContentResolver mContentResolver;
 
     private boolean mIsCreate;
 
@@ -118,9 +118,9 @@ public class SqlNote {
 
     private long mVersion;
 
-    private ContentValues mDiffNoteValues;
+    private final ContentValues mDiffNoteValues;
 
-    private ArrayList<SqlData> mDataList;
+    private final ArrayList<SqlData> mDataList;
 
     public SqlNote(Context context) {
         mContext = context;
@@ -226,7 +226,7 @@ public class SqlNote {
         }
     }
 
-    public boolean setContent(JSONObject js) {
+    public void setContent(JSONObject js) {
         try {
             JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
             if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
@@ -354,9 +354,7 @@ public class SqlNote {
         } catch (JSONException e) {
             Log.e(TAG, e.toString());
             e.printStackTrace();
-            return false;
         }
-        return true;
     }
 
     public JSONObject getContent() {
@@ -448,9 +446,9 @@ public class SqlNote {
 
             Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
             try {
-                mId = Long.valueOf(uri.getPathSegments().get(1));
+                mId = Long.parseLong(uri.getPathSegments().get(1));
             } catch (NumberFormatException e) {
-                Log.e(TAG, "Get note id error :" + e.toString());
+                Log.e(TAG, "Get note id error :" + e);
                 throw new ActionFailureException("create note failed");
             }
             if (mId == 0) {

main/java/net/micode/notes/gtask/data/TaskList.java

@@ -35,7 +35,7 @@ public class TaskList extends Node {
 
     private int mIndex;
 
-    private ArrayList<Task> mChildren;
+    private final ArrayList<Task> mChildren;
 
     public TaskList() {
         super();
@@ -220,7 +220,7 @@ public class TaskList extends Node {
         return mChildren.size();
     }
 
-    public boolean addChildTask(Task task) {
+    public void addChildTask(Task task) {
         boolean ret = false;
         if (task != null && !mChildren.contains(task)) {
             ret = mChildren.add(task);
@@ -231,7 +231,6 @@ public class TaskList extends Node {
                 task.setParent(this);
             }
         }
-        return ret;
     }
 
     public boolean addChildTask(Task task, int index) {

main/java/net/micode/notes/gtask/remote/GTaskASyncTask.java

@@ -31,19 +31,19 @@ import net.micode.notes.ui.NotesPreferenceActivity;
 
 public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
 
-    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+    private static final int GTASK_SYNC_NOTIFICATION_ID = 5234235;
 
     public interface OnCompleteListener {
         void onComplete();
     }
 
-    private Context mContext;
+    private final Context mContext;
 
-    private NotificationManager mNotifiManager;
+    private final NotificationManager mNotifiManager;
 
-    private GTaskManager mTaskManager;
+    private final GTaskManager mTaskManager;
 
-    private OnCompleteListener mOnCompleteListener;
+    private final OnCompleteListener mOnCompleteListener;
 
     public GTaskASyncTask(Context context, OnCompleteListener listener) {
         mContext = context;
@@ -119,12 +119,7 @@ public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
                     .getString(R.string.error_sync_cancelled));
         }
         if (mOnCompleteListener != null) {
-            new Thread(new Runnable() {
-
-                public void run() {
-                    mOnCompleteListener.onComplete();
-                }
-            }).start();
+            new Thread(() -> mOnCompleteListener.onComplete()).start();
         }
     }
 }

main/java/net/micode/notes/gtask/remote/GTaskClient.java

@@ -143,8 +143,8 @@ public class GTaskClient {
             int index = mAccount.name.indexOf('@') + 1;
             String suffix = mAccount.name.substring(index);
             url.append(suffix + "/");
-            mGetUrl = url.toString() + "ig";
-            mPostUrl = url.toString() + "r/ig";
+            mGetUrl = url + "ig";
+            mPostUrl = url + "r/ig";
 
             if (tryToLoginGtask(activity, authToken)) {
                 mLoggedin = true;
@@ -208,7 +208,7 @@ public class GTaskClient {
     }
 
     private boolean tryToLoginGtask(Activity activity, String authToken) {
-        if (!loginGtask(authToken)) {
+        if (loginGtask(authToken)) {
             // maybe the auth token is out of date, now let's invalidate the
             // token and try again
             authToken = loginGoogleAccount(activity, true);
@@ -217,7 +217,7 @@ public class GTaskClient {
                 return false;
             }
 
-            if (!loginGtask(authToken)) {
+            if (loginGtask(authToken)) {
                 Log.e(TAG, "login gtask failed");
                 return false;
             }
@@ -270,14 +270,14 @@ public class GTaskClient {
         } catch (JSONException e) {
             Log.e(TAG, e.toString());
             e.printStackTrace();
-            return false;
+            return true;
         } catch (Exception e) {
             // simply catch all exceptions
             Log.e(TAG, "httpget gtask_url failed");
-            return false;
+            return true;
         }
 
-        return true;
+        return false;
     }
 
     private int getActionId() {

main/java/net/micode/notes/gtask/remote/GTaskManager.java

@@ -46,6 +46,7 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.Objects;
 
 
 public class GTaskManager {
@@ -73,19 +74,19 @@ public class GTaskManager {
 
     private boolean mCancelled;
 
-    private HashMap<String, TaskList> mGTaskListHashMap;
+    private final HashMap<String, TaskList> mGTaskListHashMap;
 
-    private HashMap<String, Node> mGTaskHashMap;
+    private final HashMap<String, Node> mGTaskHashMap;
 
-    private HashMap<String, MetaData> mMetaHashMap;
+    private final HashMap<String, MetaData> mMetaHashMap;
 
     private TaskList mMetaList;
 
-    private HashSet<Long> mLocalDeleteIdMap;
+    private final HashSet<Long> mLocalDeleteIdMap;
 
-    private HashMap<String, Long> mGidToNid;
+    private final HashMap<String, Long> mGidToNid;
 
-    private HashMap<Long, String> mNidToGid;
+    private final HashMap<Long, String> mNidToGid;
 
     private GTaskManager() {
         mSyncing = false;
@@ -327,9 +328,7 @@ public class GTaskManager {
         }
 
         // go through remaining items
-        Iterator<Map.Entry<String, Node>> iter = mGTaskHashMap.entrySet().iterator();
-        while (iter.hasNext()) {
-            Map.Entry<String, Node> entry = iter.next();
+        for (Map.Entry<String, Node> entry : mGTaskHashMap.entrySet()) {
             node = entry.getValue();
             doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
         }
@@ -378,7 +377,7 @@ public class GTaskManager {
                             GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT))
                         doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
                 } else {
-                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, null, c);
                 }
             } else {
                 Log.w(TAG, "failed to query root folder");
@@ -411,7 +410,7 @@ public class GTaskManager {
                                         + GTaskStringUtils.FOLDER_CALL_NOTE))
                             doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
                     } else {
-                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, null, c);
                     }
                 }
             } else {
@@ -461,9 +460,7 @@ public class GTaskManager {
         }
 
         // for remote add folders
-        Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
-        while (iter.hasNext()) {
-            Map.Entry<String, TaskList> entry = iter.next();
+        for (Map.Entry<String, TaskList> entry : mGTaskListHashMap.entrySet()) {
             gid = entry.getKey();
             node = entry.getValue();
             if (mGTaskHashMap.containsKey(gid)) {
@@ -507,8 +504,6 @@ public class GTaskManager {
                 updateLocalNode(node, c);
                 break;
             case Node.SYNC_ACTION_UPDATE_REMOTE:
-                updateRemoteNode(node, c);
-                break;
             case Node.SYNC_ACTION_UPDATE_CONFLICT:
                 // merging both modifications maybe a good idea
                 // right now just use local update simply
@@ -581,7 +576,7 @@ public class GTaskManager {
                 Log.e(TAG, "cannot find task's parent id locally");
                 throw new ActionFailureException("cannot add local node");
             }
-            sqlNote.setParentId(parentId.longValue());
+            sqlNote.setParentId(parentId);
         }
 
         // create the local node
@@ -612,7 +607,7 @@ public class GTaskManager {
             Log.e(TAG, "cannot find task's parent id locally");
             throw new ActionFailureException("cannot update local node");
         }
-        sqlNote.setParentId(parentId.longValue());
+        sqlNote.setParentId(parentId);
         sqlNote.commit(true);
 
         // update meta info
@@ -637,7 +632,7 @@ public class GTaskManager {
                 Log.e(TAG, "cannot find task's parent tasklist");
                 throw new ActionFailureException("cannot add remote task");
             }
-            mGTaskListHashMap.get(parentGid).addChildTask(task);
+            Objects.requireNonNull(mGTaskListHashMap.get(parentGid)).addChildTask(task);
 
             GTaskClient.getInstance().createTask(task);
             n = (Node) task;
@@ -656,9 +651,7 @@ public class GTaskManager {
             else
                 folderName += sqlNote.getSnippet();
 
-            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
-            while (iter.hasNext()) {
-                Map.Entry<String, TaskList> entry = iter.next();
+            for (Map.Entry<String, TaskList> entry : mGTaskListHashMap.entrySet()) {
                 String gid = entry.getKey();
                 TaskList list = entry.getValue();
 
@@ -720,7 +713,9 @@ public class GTaskManager {
 
             if (preParentList != curParentList) {
                 preParentList.removeChildTask(task);
-                curParentList.addChildTask(task);
+                if (curParentList != null) {
+                    curParentList.addChildTask(task);
+                }
                 GTaskClient.getInstance().moveTask(task, preParentList, curParentList);
             }
         }

main/java/net/micode/notes/gtask/remote/GTaskSyncService.java

@@ -44,12 +44,10 @@ public class GTaskSyncService extends Service {
 
     private void startSync() {
         if (mSyncTask == null) {
-            mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
-                public void onComplete() {
-                    mSyncTask = null;
-                    sendBroadcast("");
-                    stopSelf();
-                }
+            mSyncTask = new GTaskASyncTask(this, () -> {
+                mSyncTask = null;
+                sendBroadcast("");
+                stopSelf();
             });
             sendBroadcast("");
             mSyncTask.execute();

main/java/net/micode/notes/model/Note.java

@@ -15,15 +15,15 @@
  */
 
 package net.micode.notes.model;
-import android.content.ContentProviderOperation;
-import android.content.ContentProviderResult;
-import android.content.ContentUris;
-import android.content.ContentValues;
-import android.content.Context;
-import android.content.OperationApplicationException;
-import android.net.Uri;
-import android.os.RemoteException;
-import android.util.Log;
+import android.content.ContentProviderOperation;   //批量的更新、插入、删除
+import android.content.ContentProviderResult;      //操作的结果
+import android.content.ContentUris;                //用于添加和获取uri后面的ID
+import android.content.ContentValues;              //一种用于存储基本数据类型数据的存储机制
+import android.content.Context;                    //需要用该类来弄清楚调用者的实例
+import android.content.OperationApplicationException;//操作应用程序容错
+import android.net.Uri;                            //表示待操作的数据
+import android.os.RemoteException;                 //远程容错
+import android.util.Log;                           //输出日志，比如出错警告等
 
 import net.micode.notes.data.Notes;
 import net.micode.notes.data.Notes.CallNote;
@@ -35,8 +35,8 @@ import java.util.ArrayList;
 
 
 public class Note {
-    private ContentValues mNoteDiffValues;
-    private NoteData mNoteData;
+    private final ContentValues mNoteDiffValues;
+    private final NoteData mNoteData;
     private static final String TAG = "Note";
     /**
      * Create a new note id for adding a new note to databases
@@ -49,16 +49,17 @@ public class Note {
         values.put(NoteColumns.MODIFIED_DATE, createdTime);
         values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
         values.put(NoteColumns.LOCAL_MODIFIED, 1);
-        values.put(NoteColumns.PARENT_ID, folderId);
+        values.put(NoteColumns.PARENT_ID, folderId);      //将数据写入数据库表格
         Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
-
+             //ContentResolver（）主要是实现外部应用对ContentProvider中的数据
         long noteId = 0;
+        //进行添加、删除、修改和查询操作
         try {
-            noteId = Long.valueOf(uri.getPathSegments().get(1));
+            noteId = Long.parseLong(uri.getPathSegments().get(1));
         } catch (NumberFormatException e) {
-            Log.e(TAG, "Get note id error :" + e.toString());
+            Log.e(TAG, "Get note id error :" + e);
             noteId = 0;
-        }
+        }   //try-catch异常处理
         if (noteId == -1) {
             throw new IllegalStateException("Wrong note id:" + noteId);
         }
@@ -68,45 +69,45 @@ public class Note {
     public Note() {
         mNoteDiffValues = new ContentValues();
         mNoteData = new NoteData();
-    }
+    }//定义两个变量用来存储便签的数据，一个是存储便签属性，一个存储便签内容
 
     public void setNoteValue(String key, String value) {
         mNoteDiffValues.put(key, value);
         mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
         mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
-    }
+    } ///设置数据库表格的标签属性数据
 
     public void setTextData(String key, String value) {
         mNoteData.setTextData(key, value);
-    }
+    }  //设置数据库表格的标签文本内容的数据
 
     public void setTextDataId(long id) {
         mNoteData.setTextDataId(id);
-    }
+    }//设置文本数据的ID
 
     public long getTextDataId() {
         return mNoteData.mTextDataId;
-    }
+    }//得到文本数据的ID
 
     public void setCallDataId(long id) {
         mNoteData.setCallDataId(id);
-    }
+    }//设置电话号码数据的ID
 
     public void setCallData(String key, String value) {
         mNoteData.setCallData(key, value);
-    }
+    } //得到电话号码数据的ID
 
     public boolean isLocalModified() {
-        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
-    }
+        return mNoteDiffValues.size() <= 0 && !mNoteData.isLocalModified();
+    }//判断是否本地修改
 
-    public boolean syncNote(Context context, long noteId) {
+    public void syncNote(Context context, long noteId) {
         if (noteId <= 0) {
             throw new IllegalArgumentException("Wrong note id:" + noteId);
         }
 
-        if (!isLocalModified()) {
-            return true;
+        if (isLocalModified()) {
+            return;
         }
 
         /**
@@ -124,20 +125,18 @@ public class Note {
 
         if (mNoteData.isLocalModified()
                 && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
-            return false;
         }
 
-        return true;
-    }
+    }//判断数据是否同步
 
-    private class NoteData {
+    private class NoteData {//定义一个基本的便签内容的数据类，主要包含文本数据和电话号码数据
         private long mTextDataId;
 
-        private ContentValues mTextDataValues;
+        private final ContentValues mTextDataValues;//文本数据
 
         private long mCallDataId;
 
-        private ContentValues mCallDataValues;
+        private final ContentValues mCallDataValues;//电话号码数据
 
         private static final String TAG = "NoteData";
 
@@ -147,7 +146,7 @@ public class Note {
             mTextDataId = 0;
             mCallDataId = 0;
         }
-
+          //下面是上述几个函数的具体实现
         boolean isLocalModified() {
             return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
         }
@@ -177,17 +176,17 @@ public class Note {
             mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
             mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
         }
-
-        Uri pushIntoContentResolver(Context context, long noteId) {
+        //
+        Uri pushIntoContentResolver(Context context, long noteId) {//将新的数据通过uri的操作存储到数据库
             /**
              * Check for safety
              */
             if (noteId <= 0) {
                 throw new IllegalArgumentException("Wrong note id:" + noteId);
-            }
+            }//判断数据是否合法
 
             ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
-            ContentProviderOperation.Builder builder = null;
+            ContentProviderOperation.Builder builder = null;//数据库的操作列表
 
             if(mTextDataValues.size() > 0) {
                 mTextDataValues.put(DataColumns.NOTE_ID, noteId);
@@ -196,7 +195,7 @@ public class Note {
                     Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
                             mTextDataValues);
                     try {
-                        setTextDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                        setTextDataId(Long.parseLong(uri.getPathSegments().get(1)));
                     } catch (NumberFormatException e) {
                         Log.e(TAG, "Insert new text data fail with noteId" + noteId);
                         mTextDataValues.clear();
@@ -209,7 +208,7 @@ public class Note {
                     operationList.add(builder.build());
                 }
                 mTextDataValues.clear();
-            }
+            }//把文本数据存入DataColumns
 
             if(mCallDataValues.size() > 0) {
                 mCallDataValues.put(DataColumns.NOTE_ID, noteId);
@@ -218,7 +217,7 @@ public class Note {
                     Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
                             mCallDataValues);
                     try {
-                        setCallDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                        setCallDataId(Long.parseLong(uri.getPathSegments().get(1)));
                     } catch (NumberFormatException e) {
                         Log.e(TAG, "Insert new call data fail with noteId" + noteId);
                         mCallDataValues.clear();
@@ -231,7 +230,7 @@ public class Note {
                     operationList.add(builder.build());
                 }
                 mCallDataValues.clear();
-            }
+            }//把电话号码数据存入DataColumns
 
             if (operationList.size() > 0) {
                 try {
@@ -240,12 +239,12 @@ public class Note {
                     return (results == null || results.length == 0 || results[0] == null) ? null
                             : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);
                 } catch (RemoteException e) {
-                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    Log.e(TAG, String.format("%s: %s", e, e.getMessage()));
                     return null;
                 } catch (OperationApplicationException e) {
-                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    Log.e(TAG, String.format("%s: %s", e, e.getMessage()));
                     return null;
-                }
+                }//存储过程中的异常处理
             }
             return null;
         }

main/java/net/micode/notes/model/WorkingNote.java

@@ -34,7 +34,7 @@ import net.micode.notes.tool.ResourceParser.NoteBgResources;
 
 public class WorkingNote {
     // Note for the working note
-    private Note mNote;
+    private final Note mNote;
     // Note Id
     private long mNoteId;
     // Note content
@@ -54,7 +54,7 @@ public class WorkingNote {
 
     private long mFolderId;
 
-    private Context mContext;
+    private final Context mContext;
 
     private static final String TAG = "WorkingNote";
 
@@ -62,7 +62,7 @@ public class WorkingNote {
 
     private NoteSettingChangedListener mNoteSettingStatusListener;
 
-    public static final String[] DATA_PROJECTION = new String[] {
+    public static final String[] DATA_PROJECTION = new String[] {//声明DATA＿PROJECTION字符串数组
             DataColumns.ID,
             DataColumns.CONTENT,
             DataColumns.MIME_TYPE,
@@ -72,7 +72,7 @@ public class WorkingNote {
             DataColumns.DATA4,
     };
 
-    public static final String[] NOTE_PROJECTION = new String[] {
+    public static final String[] NOTE_PROJECTION = new String[] {//声明NOTE_PROJECTION字符串数组
             NoteColumns.PARENT_ID,
             NoteColumns.ALERTED_DATE,
             NoteColumns.BG_COLOR_ID,
@@ -115,6 +115,7 @@ public class WorkingNote {
     }
 
     // Existing note construct
+    //WorkingNote的构造函数
     private WorkingNote(Context context, long noteId, long folderId) {
         mContext = context;
         mNoteId = noteId;
@@ -123,13 +124,14 @@ public class WorkingNote {
         mNote = new Note();
         loadNote();
     }
-
+//加载Note
+    //通过数据库调用ｑｕｅｒｙ函数找到第一个条目
     private void loadNote() {
         Cursor cursor = mContext.getContentResolver().query(
                 ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mNoteId), NOTE_PROJECTION, null,
                 null, null);
 
-        if (cursor != null) {
+        if (cursor != null) {//若存在存储相应信息
             if (cursor.moveToFirst()) {
                 mFolderId = cursor.getLong(NOTE_PARENT_ID_COLUMN);
                 mBgColorId = cursor.getInt(NOTE_BG_COLOR_ID_COLUMN);
@@ -139,21 +141,21 @@ public class WorkingNote {
                 mModifiedDate = cursor.getLong(NOTE_MODIFIED_DATE_COLUMN);
             }
             cursor.close();
-        } else {
+        } else {//若不存在，报错
             Log.e(TAG, "No note with id:" + mNoteId);
             throw new IllegalArgumentException("Unable to find note with id " + mNoteId);
         }
         loadNoteData();
     }
 
-    private void loadNoteData() {
+    private void loadNoteData() {//加载NoteData
         Cursor cursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, DATA_PROJECTION,
                 DataColumns.NOTE_ID + "=?", new String[] {
                     String.valueOf(mNoteId)
                 }, null);
 
-        if (cursor != null) {
-            if (cursor.moveToFirst()) {
+        if (cursor != null) {//查到数据不为空
+            if (cursor.moveToFirst()) {//查看第一项是否存在
                 do {
                     String type = cursor.getString(DATA_MIME_TYPE_COLUMN);
                     if (DataConstants.NOTE.equals(type)) {
@@ -165,7 +167,7 @@ public class WorkingNote {
                     } else {
                         Log.d(TAG, "Wrong note type with type:" + type);
                     }
-                } while (cursor.moveToNext());
+                } while (cursor.moveToNext());//查阅所有项，直到为空
             }
             cursor.close();
         } else {
@@ -173,9 +175,10 @@ public class WorkingNote {
             throw new IllegalArgumentException("Unable to find note's data with id " + mNoteId);
         }
     }
-
+    //创建空的Note
+    //传参：context，文件夹id，widget，背景颜色
     public static WorkingNote createEmptyNote(Context context, long folderId, int widgetId,
-            int widgetType, int defaultBgColorId) {
+            int widgetType, int defaultBgColorId) {//设置相关属性
         WorkingNote note = new WorkingNote(context, folderId);
         note.setBgColorId(defaultBgColorId);
         note.setWidgetId(widgetId);
@@ -186,10 +189,10 @@ public class WorkingNote {
     public static WorkingNote load(Context context, long id) {
         return new WorkingNote(context, id, 0);
     }
-
+    //保存Note
     public synchronized boolean saveNote() {
-        if (isWorthSaving()) {
-            if (!existInDatabase()) {
+        if (isWorthSaving()) {//是否值得保存
+            if (!existInDatabase()) {//是否存在数据库中
                 if ((mNoteId = Note.getNewNoteId(mContext, mFolderId)) == 0) {
                     Log.e(TAG, "Create new note fail with id:" + mNoteId);
                     return false;
@@ -211,24 +214,22 @@ public class WorkingNote {
             return false;
         }
     }
-
+    //是否在数据库中存在
     public boolean existInDatabase() {
         return mNoteId > 0;
     }
-
+    //是否值得保存
     private boolean isWorthSaving() {
-        if (mIsDeleted || (!existInDatabase() && TextUtils.isEmpty(mContent))
-                || (existInDatabase() && !mNote.isLocalModified())) {
-            return false;
-        } else {
-            return true;
-        }
+        //被删除或不在数据库中，内容为空或本地已保存过
+        return !mIsDeleted && (existInDatabase() || !TextUtils.isEmpty(mContent))
+                && (!existInDatabase() || !mNote.isLocalModified());
     }
-
+    //设置MnoteSettingStatusListener
     public void setOnSettingStatusChangedListener(NoteSettingChangedListener l) {
         mNoteSettingStatusListener = l;
     }
-
+    //设置AlertDate
+    //若ｍＡｌｅｒｔＤａｔｅ与data不同，则更改ｍＡｌｅｒｔＤａｔｅ并设定NoteValue
     public void setAlertDate(long date, boolean set) {
         if (date != mAlertDate) {
             mAlertDate = date;
@@ -238,17 +239,19 @@ public class WorkingNote {
             mNoteSettingStatusListener.onClockAlertChanged(date, set);
         }
     }
-
+    //设定删除标记
     public void markDeleted(boolean mark) {
+        //设定标记
         mIsDeleted = mark;
         if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
                 && mWidgetType != Notes.TYPE_WIDGET_INVALIDE && mNoteSettingStatusListener != null) {
                 mNoteSettingStatusListener.onWidgetChanged();
+                //调用ｍNoteSettingStatusListener的ｏｎＷｉｄｇｅｔＣｈａｎｇｅｄ方法
         }
     }
-
+    //设定背景颜色
     public void setBgColorId(int id) {
-        if (id != mBgColorId) {
+        if (id != mBgColorId) {//设定条件id！＝ｍＢｇＣｏｌｏｒＩｄ
             mBgColorId = id;
             if (mNoteSettingStatusListener != null) {
                 mNoteSettingStatusListener.onBackgroundColorChanged();
@@ -256,9 +259,10 @@ public class WorkingNote {
             mNote.setNoteValue(NoteColumns.BG_COLOR_ID, String.valueOf(id));
         }
     }
-
+    //设定检查列表模式
+    //参数：mode
     public void setCheckListMode(int mode) {
-        if (mMode != mode) {
+        if (mMode != mode) {//设定条件ｍＭｏｄｅ！＝ｍｏｄｅ
             if (mNoteSettingStatusListener != null) {
                 mNoteSettingStatusListener.onCheckListModeChanged(mMode, mode);
             }
@@ -266,82 +270,91 @@ public class WorkingNote {
             mNote.setTextData(TextNote.MODE, String.valueOf(mMode));
         }
     }
-
+    //设定WidgetType
+    //参数：type
     public void setWidgetType(int type) {
-        if (type != mWidgetType) {
+        if (type != mWidgetType) {//设定条件type！＝ｍWidgetType
             mWidgetType = type;
             mNote.setNoteValue(NoteColumns.WIDGET_TYPE, String.valueOf(mWidgetType));
+            //调用Note的setNoteValue方法更改WidgetType
         }
     }
-
+    //设定Widgetid
+    //参数：id
     public void setWidgetId(int id) {
-        if (id != mWidgetId) {
+        if (id != mWidgetId) {//设定条件Id！＝ｍWidgetid
             mWidgetId = id;
             mNote.setNoteValue(NoteColumns.WIDGET_ID, String.valueOf(mWidgetId));
+        //调用Note的setNoteValue方法更改WidgetId
         }
     }
-
+    //设定WorkingTex
+    //参数：更改的text
     public void setWorkingText(String text) {
-        if (!TextUtils.equals(mContent, text)) {
+        if (!TextUtils.equals(mContent, text)) {//设定条件ｍContent，text内容不同
             mContent = text;
             mNote.setTextData(DataColumns.CONTENT, mContent);
+            //调用Note的setTextData方法更改WorkingText
         }
     }
-
+    //转变ｍNote的CallData及CallNote信息
+    //参数：String　phoneNumber，Long　callDate
     public void convertToCallNote(String phoneNumber, long callDate) {
         mNote.setCallData(CallNote.CALL_DATE, String.valueOf(callDate));
         mNote.setCallData(CallNote.PHONE_NUMBER, phoneNumber);
         mNote.setNoteValue(NoteColumns.PARENT_ID, String.valueOf(Notes.ID_CALL_RECORD_FOLDER));
     }
-
+    //判断是否有时钟题型
     public boolean hasClockAlert() {
-        return (mAlertDate > 0 ? true : false);
+        return (mAlertDate > 0);
     }
-
+    //获取content
     public String getContent() {
         return mContent;
     }
-
+    //获取AlertDate
     public long getAlertDate() {
         return mAlertDate;
     }
-
+    //获取ModifiedDate
     public long getModifiedDate() {
         return mModifiedDate;
     }
-
+    //获取背景颜色来源id
     public int getBgColorResId() {
         return NoteBgResources.getNoteBgResource(mBgColorId);
     }
-
+    //获取背景颜色id
     public int getBgColorId() {
         return mBgColorId;
     }
-
+    //获取标题背景颜色id
     public int getTitleBgResId() {
         return NoteBgResources.getNoteTitleBgResource(mBgColorId);
     }
-
+    //获取CheckListMode
     public int getCheckListMode() {
         return mMode;
     }
-
+    //获取便签id
     public long getNoteId() {
         return mNoteId;
     }
-
+    //获取文件夹id
     public long getFolderId() {
         return mFolderId;
     }
-
+    //获取WidgetId
     public int getWidgetId() {
         return mWidgetId;
     }
-
+    //获取WidgetType
     public int getWidgetType() {
         return mWidgetType;
     }
-
+    //创建接口NoteSettingChangedListener，便签更新监视
+    //为NoteEditActivity提供接口
+    //提供函数有
     public interface NoteSettingChangedListener {
         /**
          * Called when the background color of current note has just changed

main/java/net/micode/notes/tool/BackupUtils.java

@@ -42,7 +42,15 @@ public class BackupUtils {
     private static BackupUtils sInstance;
 
     public static synchronized BackupUtils getInstance(Context context) {
+        /*
+        ynchronized 关键字，代表这个方法加锁,相当于不管哪一个线程（例如线程A）
+        运行到这个方法时,都要检查有没有其它线程B（或者C、 D等）正在用这个方法(或者该类的其他同步方法)，
+        有的话要等正在使用synchronized方法的线程B（或者C 、D）运行完这个方法后再运行此线程A,
+        没有的话,锁定调用者,然后直接运行。
+        它包括两种用法：synchronized 方法和 synchronized 块
+         */
         if (sInstance == null) {
+            //如果当前备份不存在，则新声明一个
             sInstance = new BackupUtils(context);
         }
         return sInstance;
@@ -53,19 +61,20 @@ public class BackupUtils {
      * status
      */
     // Currently, the sdcard is not mounted
+            //sd卡没有装入手机
     public static final int STATE_SD_CARD_UNMOUONTED           = 0;
-    // The backup file not exist
+    // The backup file not exist  备份文件夹不存在
     public static final int STATE_BACKUP_FILE_NOT_EXIST        = 1;
-    // The data is not well formated, may be changed by other programs
+    // The data is not well formated, may be changed by other programs数据已被损坏
     public static final int STATE_DATA_DESTROIED               = 2;
-    // Some run-time exception which causes restore or backup fails
+    // Some run-time exception which causes restore or backup fails超时异常
     public static final int STATE_SYSTEM_ERROR                 = 3;
-    // Backup or restore success
+    // Backup or restore success成功存储
     public static final int STATE_SUCCESS                      = 4;
 
-    private TextExport mTextExport;
+    private final TextExport mTextExport;
 
-    private BackupUtils(Context context) {
+    private BackupUtils(Context context) {  //初始化函数
         mTextExport = new TextExport(context);
     }
 
@@ -121,7 +130,7 @@ public class BackupUtils {
         private static final int FORMAT_NOTE_DATE            = 1;
         private static final int FORMAT_NOTE_CONTENT         = 2;
 
-        private Context mContext;
+        private final Context mContext;
         private String mFileName;
         private String mFileDirectory;
 
@@ -132,7 +141,8 @@ public class BackupUtils {
             mFileDirectory = "";
         }
 
-        private String getFormat(int id) {
+        private String getFormat(int id) {//获取文本的组成部分
+
             return TEXT_FORMAT[id];
         }
 
@@ -140,7 +150,7 @@ public class BackupUtils {
          * Export the folder identified by folder id to text
          */
         private void exportFolderToText(String folderId, PrintStream ps) {
-            // Query notes belong to this folder
+            // Query notes belong to this folder通过查询parent id是文件夹id的note来选出制定ID文件夹下的Note
             Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
                     NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
                         folderId
@@ -149,13 +159,13 @@ public class BackupUtils {
             if (notesCursor != null) {
                 if (notesCursor.moveToFirst()) {
                     do {
-                        // Print note's last modified date
+                        // Print note's last modified date  ps里保存有这份note的日期
                         ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
                                 mContext.getString(R.string.format_datetime_mdhm),
                                 notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
                         // Query data belong to this note
                         String noteId = notesCursor.getString(NOTE_COLUMN_ID);
-                        exportNoteToText(noteId, ps);
+                        exportNoteToText(noteId, ps);//将文件导出到text
                     } while (notesCursor.moveToNext());
                 }
                 notesCursor.close();
@@ -171,7 +181,7 @@ public class BackupUtils {
                         noteId
                     }, null);
 
-            if (dataCursor != null) {
+            if (dataCursor != null) {//利用光标来扫描内容，区别为callnote和note两种，靠ps.printline输出
                 if (dataCursor.moveToFirst()) {
                     do {
                         String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
@@ -181,7 +191,7 @@ public class BackupUtils {
                             long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
                             String location = dataCursor.getString(DATA_COLUMN_CONTENT);
 
-                            if (!TextUtils.isEmpty(phoneNumber)) {
+                            if (!TextUtils.isEmpty(phoneNumber)) {//判断是否为空字符
                                 ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
                                         phoneNumber));
                             }
@@ -218,7 +228,7 @@ public class BackupUtils {
         /**
          * Note will be exported as text which is user readable
          */
-        public int exportToText() {
+        public int exportToText() {//总函数，调用上面的exportFolder和exportNote
             if (!externalStorageAvailable()) {
                 Log.d(TAG, "Media was not mounted");
                 return STATE_SD_CARD_UNMOUONTED;
@@ -229,7 +239,7 @@ public class BackupUtils {
                 Log.e(TAG, "get print stream error");
                 return STATE_SYSTEM_ERROR;
             }
-            // First export folder and its notes
+            // First export folder and its notes导出文件夹，就是导出里面包含的便签
             Cursor folderCursor = mContext.getContentResolver().query(
                     Notes.CONTENT_NOTE_URI,
                     NOTE_PROJECTION,
@@ -257,7 +267,7 @@ public class BackupUtils {
                 folderCursor.close();
             }
 
-            // Export notes in root's folder
+            // Export notes in root's folder将根目录中的便签导出
             Cursor noteCursor = mContext.getContentResolver().query(
                     Notes.CONTENT_NOTE_URI,
                     NOTE_PROJECTION,
@@ -297,7 +307,7 @@ public class BackupUtils {
             PrintStream ps = null;
             try {
                 FileOutputStream fos = new FileOutputStream(file);
-                ps = new PrintStream(fos);
+                ps = new PrintStream(fos);//将ps输出流输出到特定的文件，目的就是导出到文件，而不是直接输出
             } catch (FileNotFoundException e) {
                 e.printStackTrace();
                 return null;
@@ -314,16 +324,16 @@ public class BackupUtils {
      */
     private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
         StringBuilder sb = new StringBuilder();
-        sb.append(Environment.getExternalStorageDirectory());
-        sb.append(context.getString(filePathResId));
-        File filedir = new File(sb.toString());
+        sb.append(Environment.getExternalStorageDirectory());//sd卡的存储路径
+        sb.append(context.getString(filePathResId));//文件的存储路径
+        File filedir = new File(sb.toString());//filedir存储路径信息
         sb.append(context.getString(
                 fileNameFormatResId,
                 DateFormat.format(context.getString(R.string.format_date_ymd),
                         System.currentTimeMillis())));
         File file = new File(sb.toString());
 
-        try {
+        try {//如果这些文件都不存在，则新建
             if (!filedir.exists()) {
                 filedir.mkdir();
             }

main/java/net/micode/notes/tool/DataUtils.java

@@ -37,7 +37,7 @@ import java.util.HashSet;
 
 public class DataUtils {
     public static final String TAG = "DataUtils";
-    public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {
+    public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {//直接删除多个笔记
         if (ids == null) {
             Log.d(TAG, "the ids is null");
             return true;
@@ -47,27 +47,28 @@ public class DataUtils {
             return true;
         }
 
-        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();//提供一个新的任务列表
         for (long id : ids) {
             if(id == Notes.ID_ROOT_FOLDER) {
                 Log.e(TAG, "Don't delete system folder root");
                 continue;
-            }
+            }//如果发现是根文件夹，则不删除
             ContentProviderOperation.Builder builder = ContentProviderOperation
-                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));//用newdelete实现删除功能
             operationList.add(builder.build());
         }
         try {
-            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);//主机名
+            //数据库事务，数据库事务是由一组数据库操作序列组成，事务作为一个整体被执行
             if (results == null || results.length == 0 || results[0] == null) {
-                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                Log.d(TAG, "delete notes failed, ids:" + ids);
                 return false;
             }
             return true;
         } catch (RemoteException e) {
-            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+            Log.e(TAG, String.format("%s: %s", e, e.getMessage()));
         } catch (OperationApplicationException e) {
-            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+            Log.e(TAG, String.format("%s: %s", e, e.getMessage()));
         }
         return false;
     }
@@ -77,7 +78,7 @@ public class DataUtils {
         values.put(NoteColumns.PARENT_ID, desFolderId);
         values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);
         values.put(NoteColumns.LOCAL_MODIFIED, 1);
-        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);
+        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);//对需要移动的便签进行数据更新，然后用update实现
     }
 
     public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
@@ -90,23 +91,23 @@ public class DataUtils {
         ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
         for (long id : ids) {
             ContentProviderOperation.Builder builder = ContentProviderOperation
-                    .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+                    .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));//通过withAppendedId方法，为该Uri加上ID
             builder.withValue(NoteColumns.PARENT_ID, folderId);
             builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
             operationList.add(builder.build());
-        }
+        }//将ids里包含的每一列的数据逐次加入到operationList中，等待最后的批量处理
 
         try {
-            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);//applyBatch一次性处理一个操作列表
             if (results == null || results.length == 0 || results[0] == null) {
-                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                Log.d(TAG, "delete notes failed, ids:" + ids);
                 return false;
             }
             return true;
         } catch (RemoteException e) {
-            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+            Log.e(TAG, String.format("%s: %s", e, e.getMessage()));
         } catch (OperationApplicationException e) {
-            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+            Log.e(TAG, String.format("%s: %s", e, e.getMessage()));
         }
         return false;
     }
@@ -119,7 +120,7 @@ public class DataUtils {
                 new String[] { "COUNT(*)" },
                 NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
                 new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
-                null);
+                null);//筛选条件：源文件不为trash folder
 
         int count = 0;
         if(cursor != null) {
@@ -127,7 +128,7 @@ public class DataUtils {
                 try {
                     count = cursor.getInt(0);
                 } catch (IndexOutOfBoundsException e) {
-                    Log.e(TAG, "get folder count failed:" + e.toString());
+                    Log.e(TAG, "get folder count failed:" + e);
                 } finally {
                     cursor.close();
                 }
@@ -141,11 +142,11 @@ public class DataUtils {
                 null,
                 NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
                 new String [] {String.valueOf(type)},
-                null);
+                null);//查询条件：type符合，且不属于垃圾文件夹
 
         boolean exist = false;
         if (cursor != null) {
-            if (cursor.getCount() > 0) {
+            if (cursor.getCount() > 0) {//用getcount函数判断cursor是否为空
                 exist = true;
             }
             cursor.close();
@@ -187,6 +188,7 @@ public class DataUtils {
                 " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
                 " AND " + NoteColumns.SNIPPET + "=?",
                 new String[] { name }, null);
+        //通过名字查询文件是否存在
         boolean exist = false;
         if(cursor != null) {
             if(cursor.getCount() > 0) {
@@ -202,7 +204,7 @@ public class DataUtils {
                 new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
                 NoteColumns.PARENT_ID + "=?",
                 new String[] { String.valueOf(folderId) },
-                null);
+                null);//查询条件：父id是传入的folderid
 
         HashSet<AppWidgetAttribute> set = null;
         if (c != null) {
@@ -211,13 +213,13 @@ public class DataUtils {
                 do {
                     try {
                         AppWidgetAttribute widget = new AppWidgetAttribute();
-                        widget.widgetId = c.getInt(0);
-                        widget.widgetType = c.getInt(1);
+                        widget.widgetId = c.getInt(0);//0对应的NoteColumns.WIDGET_ID
+                        widget.widgetType = c.getInt(1);//1对应的NoteColumns.WIDGET_TYPE
                         set.add(widget);
                     } catch (IndexOutOfBoundsException e) {
                         Log.e(TAG, e.toString());
                     }
-                } while (c.moveToNext());
+                } while (c.moveToNext());//查询下一条
             }
             c.close();
         }
@@ -235,7 +237,7 @@ public class DataUtils {
             try {
                 return cursor.getString(0);
             } catch (IndexOutOfBoundsException e) {
-                Log.e(TAG, "Get call number fails " + e.toString());
+                Log.e(TAG, "Get call number fails " + e);
             } finally {
                 cursor.close();
             }
@@ -250,13 +252,14 @@ public class DataUtils {
                 + CallNote.PHONE_NUMBER + ",?)",
                 new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
                 null);
+        //通过数据库操作，查询条件是（callDATe和phoneNumber匹配传入参数的值
 
         if (cursor != null) {
             if (cursor.moveToFirst()) {
                 try {
-                    return cursor.getLong(0);
+                    return cursor.getLong(0);//0对应的CallNote.Note_ID
                 } catch (IndexOutOfBoundsException e) {
-                    Log.e(TAG, "Get call note id fails " + e.toString());
+                    Log.e(TAG, "Get call note id fails " + e);
                 }
             }
             cursor.close();
@@ -269,7 +272,7 @@ public class DataUtils {
                 new String [] { NoteColumns.SNIPPET },
                 NoteColumns.ID + "=?",
                 new String [] { String.valueOf(noteId)},
-                null);
+                null);//查询条件：noteId
 
         if (cursor != null) {
             String snippet = "";
@@ -282,7 +285,7 @@ public class DataUtils {
         throw new IllegalArgumentException("Note is not found with id: " + noteId);
     }
 
-    public static String getFormattedSnippet(String snippet) {
+    public static String getFormattedSnippet(String snippet) {//对字符串进行格式处理，将字符串两头的空格去掉，同时将换行符去掉
         if (snippet != null) {
             snippet = snippet.trim();
             int index = snippet.indexOf('\n');

main/java/net/micode/notes/tool/GTaskStringUtils.java

@@ -15,7 +15,7 @@
  */
 
 package net.micode.notes.tool;
-
+//这个类就是定义了一堆static string，实际就是为jsonObject提供Key，把这些定义全部写到一个类里，方便查看管理，是一个非常好的编程习惯
 public class GTaskStringUtils {
 
     public final static String GTASK_JSON_ACTION_ID = "action_id";

main/java/net/micode/notes/tool/ResourceParser.java

@@ -13,7 +13,20 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+/*简介：字面意义是资源分析器，实际上就是获取资源并且在程序中使用，比如颜色图片等
+ * 实现方法：主要利用R.java这个类，其中包括
+ * R.id      组件资源引用
+ * R.drawable  图片资源 （被使用）
+ * R.layout  布局资源
+ * R.menu   菜单资源
+ * R.String  文字资源
+ * R.style    主题资源 （被使用）
+ * 在按顺序设置好相应的id后，就可以编写简单的getXXX函数获取需要的资源
+ *
+ * 特殊的变量 ：
+ * @BG_DEFAULT_COLOR 默认背景颜色（黄）
+ * BG_DEFAULT_FONT_SIZE 默认文本大小（中）
+ */
 package net.micode.notes.tool;
 
 import android.content.Context;
@@ -161,7 +174,7 @@ public class ResourceParser {
             R.style.TextAppearanceLarge,
             R.style.TextAppearanceSuper
         };
-
+        //这里有一个容错的函数，防止输入的id大于资源总量，若如此，则自动返回默认的设置结果
         public static int getTexAppearanceResource(int id) {
             /**
              * HACKME: Fix bug of store the resource id in shared preference.

main/java/net/micode/notes/ui/AlarmAlertActivity.java

@@ -64,7 +64,7 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         Intent intent = getIntent();
 
         try {
-            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
+            mNoteId = Long.parseLong(intent.getData().getPathSegments().get(1));
             mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
             mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
                     SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
@@ -131,15 +131,11 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
     }
 
     public void onClick(DialogInterface dialog, int which) {
-        switch (which) {
-            case DialogInterface.BUTTON_NEGATIVE:
-                Intent intent = new Intent(this, NoteEditActivity.class);
-                intent.setAction(Intent.ACTION_VIEW);
-                intent.putExtra(Intent.EXTRA_UID, mNoteId);
-                startActivity(intent);
-                break;
-            default:
-                break;
+        if (which == DialogInterface.BUTTON_NEGATIVE) {
+            Intent intent = new Intent(this, NoteEditActivity.class);
+            intent.setAction(Intent.ACTION_VIEW);
+            intent.putExtra(Intent.EXTRA_UID, mNoteId);
+            startActivity(intent);
         }
     }
 

main/java/net/micode/notes/ui/AlarmInitReceiver.java

@@ -53,7 +53,7 @@ public class AlarmInitReceiver extends BroadcastReceiver {
                     long alertDate = c.getLong(COLUMN_ALERTED_DATE);
                     Intent sender = new Intent(context, AlarmReceiver.class);
                     sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
-                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
+                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, PendingIntent.FLAG_IMMUTABLE);
                     AlarmManager alermManager = (AlarmManager) context
                             .getSystemService(Context.ALARM_SERVICE);
                     alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);

main/java/net/micode/notes/ui/DateTimePicker.java

@@ -50,9 +50,9 @@ public class DateTimePicker extends FrameLayout {
     private final NumberPicker mHourSpinner;
     private final NumberPicker mMinuteSpinner;
     private final NumberPicker mAmPmSpinner;
-    private Calendar mDate;
+    private final Calendar mDate;
 
-    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
+    private final String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
 
     private boolean mIsAm;
 
@@ -64,7 +64,7 @@ public class DateTimePicker extends FrameLayout {
 
     private OnDateTimeChangedListener mOnDateTimeChangedListener;
 
-    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
+    private final NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
             mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
@@ -73,7 +73,7 @@ public class DateTimePicker extends FrameLayout {
         }
     };
 
-    private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
+    private final NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
             boolean isDateChanged = false;
@@ -115,7 +115,7 @@ public class DateTimePicker extends FrameLayout {
         }
     };
 
-    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
+    private final NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
             int minValue = mMinuteSpinner.getMinValue();
@@ -144,7 +144,7 @@ public class DateTimePicker extends FrameLayout {
         }
     };
 
-    private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
+    private final NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
             mIsAm = !mIsAm;

main/java/net/micode/notes/ui/DateTimePickerDialog.java

@@ -31,10 +31,10 @@ import android.text.format.DateUtils;
 
 public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
 
-    private Calendar mDate = Calendar.getInstance();
+    private final Calendar mDate = Calendar.getInstance();
     private boolean mIs24HourView;
     private OnDateTimeSetListener mOnDateTimeSetListener;
-    private DateTimePicker mDateTimePicker;
+    private final DateTimePicker mDateTimePicker;
 
     public interface OnDateTimeSetListener {
         void OnDateTimeSet(AlertDialog dialog, long date);
@@ -44,16 +44,13 @@ public class DateTimePickerDialog extends AlertDialog implements OnClickListener
         super(context);
         mDateTimePicker = new DateTimePicker(context);
         setView(mDateTimePicker);
-        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
-            public void onDateTimeChanged(DateTimePicker view, int year, int month,
-                    int dayOfMonth, int hourOfDay, int minute) {
-                mDate.set(Calendar.YEAR, year);
-                mDate.set(Calendar.MONTH, month);
-                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
-                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
-                mDate.set(Calendar.MINUTE, minute);
-                updateTitle(mDate.getTimeInMillis());
-            }
+        mDateTimePicker.setOnDateTimeChangedListener((view, year, month, dayOfMonth, hourOfDay, minute) -> {
+            mDate.set(Calendar.YEAR, year);
+            mDate.set(Calendar.MONTH, month);
+            mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+            mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
+            mDate.set(Calendar.MINUTE, minute);
+            updateTitle(mDate.getTimeInMillis());
         });
         mDate.setTimeInMillis(date);
         mDate.set(Calendar.SECOND, 0);
@@ -77,7 +74,7 @@ public class DateTimePickerDialog extends AlertDialog implements OnClickListener
             DateUtils.FORMAT_SHOW_YEAR |
             DateUtils.FORMAT_SHOW_DATE |
             DateUtils.FORMAT_SHOW_TIME;
-        flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR;
+        flag |= DateUtils.FORMAT_24HOUR;
         setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
     }
 

main/java/net/micode/notes/ui/DropdownMenu.java

@@ -28,9 +28,9 @@ import android.widget.PopupMenu.OnMenuItemClickListener;
 import net.micode.notes.R;
 
 public class DropdownMenu {
-    private Button mButton;
-    private PopupMenu mPopupMenu;
-    private Menu mMenu;
+    private final Button mButton;
+    private final PopupMenu mPopupMenu;
+    private final Menu mMenu;
 
     public DropdownMenu(Context context, Button button, int menuId) {
         mButton = button;
@@ -38,11 +38,7 @@ public class DropdownMenu {
         mPopupMenu = new PopupMenu(context, mButton);
         mMenu = mPopupMenu.getMenu();
         mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
-        mButton.setOnClickListener(new OnClickListener() {
-            public void onClick(View v) {
-                mPopupMenu.show();
-            }
-        });
+        mButton.setOnClickListener(v -> mPopupMenu.show());
     }
 
     public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {

main/java/net/micode/notes/ui/FoldersListAdapter.java

@@ -64,7 +64,7 @@ public class FoldersListAdapter extends CursorAdapter {
     }
 
     private class FolderListItem extends LinearLayout {
-        private TextView mName;
+        private final TextView mName;
 
         public FolderListItem(Context context) {
             super(context);

main/java/net/micode/notes/ui/NoteEditActivity.java

@@ -24,7 +24,6 @@ import android.app.SearchManager;
 import android.appwidget.AppWidgetManager;
 import android.content.ContentUris;
 import android.content.Context;
-import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.graphics.Paint;
@@ -44,8 +43,6 @@ import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.WindowManager;
 import android.widget.CheckBox;
-import android.widget.CompoundButton;
-import android.widget.CompoundButton.OnCheckedChangeListener;
 import android.widget.EditText;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
@@ -60,7 +57,6 @@ import net.micode.notes.model.WorkingNote.NoteSettingChangedListener;
 import net.micode.notes.tool.DataUtils;
 import net.micode.notes.tool.ResourceParser;
 import net.micode.notes.tool.ResourceParser.TextAppearanceResources;
-import net.micode.notes.ui.DateTimePickerDialog.OnDateTimeSetListener;
 import net.micode.notes.ui.NoteEditText.OnTextViewChangeListener;
 import net.micode.notes.widget.NoteWidgetProvider_2x;
 import net.micode.notes.widget.NoteWidgetProvider_4x;
@@ -74,7 +70,7 @@ import java.util.regex.Pattern;
 
 public class NoteEditActivity extends Activity implements OnClickListener,
         NoteSettingChangedListener, OnTextViewChangeListener {
-    private class HeadViewHolder {
+    private static class HeadViewHolder {
         public TextView tvModified;
 
         public ImageView ivAlertIcon;
@@ -309,7 +305,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         } else {
             mNoteHeaderHolder.tvAlertDate.setVisibility(View.GONE);
             mNoteHeaderHolder.ivAlertIcon.setVisibility(View.GONE);
-        };
+        }
     }
 
     @Override
@@ -336,13 +332,13 @@ public class NoteEditActivity extends Activity implements OnClickListener,
     @Override
     public boolean dispatchTouchEvent(MotionEvent ev) {
         if (mNoteBgColorSelector.getVisibility() == View.VISIBLE
-                && !inRangeOfView(mNoteBgColorSelector, ev)) {
+                && inRangeOfView(mNoteBgColorSelector, ev)) {
             mNoteBgColorSelector.setVisibility(View.GONE);
             return true;
         }
 
         if (mFontSizeSelector.getVisibility() == View.VISIBLE
-                && !inRangeOfView(mFontSizeSelector, ev)) {
+                && inRangeOfView(mFontSizeSelector, ev)) {
             mFontSizeSelector.setVisibility(View.GONE);
             return true;
         }
@@ -354,13 +350,10 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         view.getLocationOnScreen(location);
         int x = location[0];
         int y = location[1];
-        if (ev.getX() < x
+        return ev.getX() < x
                 || ev.getX() > (x + view.getWidth())
                 || ev.getY() < y
-                || ev.getY() > (y + view.getHeight())) {
-                    return false;
-                }
-        return true;
+                || ev.getY() > (y + view.getHeight());
     }
 
     private void initResources() {
@@ -383,7 +376,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         for (int id : sFontSizeBtnsMap.keySet()) {
             View view = findViewById(id);
             view.setOnClickListener(this);
-        };
+        }
         mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
         mFontSizeId = mSharedPrefs.getInt(PREFERENCE_FONT_SIZE, ResourceParser.BG_DEFAULT_FONT_SIZE);
         /**
@@ -430,7 +423,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         if (id == R.id.btn_set_bg_color) {
             mNoteBgColorSelector.setVisibility(View.VISIBLE);
             findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
-                    -                    View.VISIBLE);
+                    View.VISIBLE);
         } else if (sBgSelectorBtnsMap.containsKey(id)) {
             findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
                     View.GONE);
@@ -517,11 +510,9 @@ public class NoteEditActivity extends Activity implements OnClickListener,
                 builder.setIcon(android.R.drawable.ic_dialog_alert);
                 builder.setMessage(getString(R.string.alert_message_delete_note));
                 builder.setPositiveButton(android.R.string.ok,
-                        new DialogInterface.OnClickListener() {
-                            public void onClick(DialogInterface dialog, int which) {
-                                deleteCurrentNote();
-                                finish();
-                            }
+                        (dialog, which) -> {
+                            deleteCurrentNote();
+                            finish();
                         });
                 builder.setNegativeButton(android.R.string.cancel, null);
                 builder.show();
@@ -555,11 +546,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
 
     private void setReminder() {
         DateTimePickerDialog d = new DateTimePickerDialog(this, System.currentTimeMillis());
-        d.setOnDateTimeSetListener(new OnDateTimeSetListener() {
-            public void OnDateTimeSet(AlertDialog dialog, long date) {
-                mWorkingNote.setAlertDate(date	, true);
-            }
-        });
+        d.setOnDateTimeSetListener((dialog, date) -> mWorkingNote.setAlertDate(date	, true));
         d.show();
     }
 
@@ -623,7 +610,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         if (mWorkingNote.getNoteId() > 0) {
             Intent intent = new Intent(this, AlarmReceiver.class);
             intent.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mWorkingNote.getNoteId()));
-            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
+            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_IMMUTABLE);
             AlarmManager alarmManager = ((AlarmManager) getSystemService(ALARM_SERVICE));
             showAlertHeader();
             if(!set) {
@@ -730,13 +717,11 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         final NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
         edit.setTextAppearance(this, TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
         CheckBox cb = ((CheckBox) view.findViewById(R.id.cb_edit_item));
-        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
-            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
-                if (isChecked) {
-                    edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
-                } else {
-                    edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
-                }
+        cb.setOnCheckedChangeListener((buttonView, isChecked) -> {
+            if (isChecked) {
+                edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
+            } else {
+                edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
             }
         });
 

main/java/net/micode/notes/ui/NoteEditText.java

@@ -16,6 +16,7 @@
 
 package net.micode.notes.ui;
 
+import android.annotation.SuppressLint;
 import android.content.Context;
 import android.graphics.Rect;
 import android.text.Layout;
@@ -99,23 +100,21 @@ public class NoteEditText extends EditText {
         // TODO Auto-generated constructor stub
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     @Override
     public boolean onTouchEvent(MotionEvent event) {
-        switch (event.getAction()) {
-            case MotionEvent.ACTION_DOWN:
-
-                int x = (int) event.getX();
-                int y = (int) event.getY();
-                x -= getTotalPaddingLeft();
-                y -= getTotalPaddingTop();
-                x += getScrollX();
-                y += getScrollY();
-
-                Layout layout = getLayout();
-                int line = layout.getLineForVertical(y);
-                int off = layout.getOffsetForHorizontal(line, x);
-                Selection.setSelection(getText(), off);
-                break;
+        if (event.getAction() == MotionEvent.ACTION_DOWN) {
+            int x = (int) event.getX();
+            int y = (int) event.getY();
+            x -= getTotalPaddingLeft();
+            y -= getTotalPaddingTop();
+            x += getScrollX();
+            y += getScrollY();
+
+            Layout layout = getLayout();
+            int line = layout.getLineForVertical(y);
+            int off = layout.getOffsetForHorizontal(line, x);
+            Selection.setSelection(getText(), off);
         }
 
         return super.onTouchEvent(event);
@@ -170,11 +169,7 @@ public class NoteEditText extends EditText {
     @Override
     protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
         if (mOnTextViewChangeListener != null) {
-            if (!focused && TextUtils.isEmpty(getText())) {
-                mOnTextViewChangeListener.onTextChange(mIndex, false);
-            } else {
-                mOnTextViewChangeListener.onTextChange(mIndex, true);
-            }
+            mOnTextViewChangeListener.onTextChange(mIndex, focused || !TextUtils.isEmpty(getText()));
         }
         super.onFocusChanged(focused, direction, previouslyFocusedRect);
     }
@@ -192,7 +187,7 @@ public class NoteEditText extends EditText {
             if (urls.length == 1) {
                 int defaultResId = 0;
                 for(String schema: sSchemaActionResMap.keySet()) {
-                    if(urls[0].getURL().indexOf(schema) >= 0) {
+                    if(urls[0].getURL().contains(schema)) {
                         defaultResId = sSchemaActionResMap.get(schema);
                         break;
                     }
@@ -203,12 +198,10 @@ public class NoteEditText extends EditText {
                 }
 
                 menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
-                        new OnMenuItemClickListener() {
-                            public boolean onMenuItemClick(MenuItem item) {
-                                // goto a new intent
-                                urls[0].onClick(NoteEditText.this);
-                                return true;
-                            }
+                        item -> {
+                            // goto a new intent
+                            urls[0].onClick(NoteEditText.this);
+                            return true;
                         });
             }
         }

main/java/net/micode/notes/ui/NoteItemData.java

@@ -55,18 +55,18 @@ public class NoteItemData {
     private static final int WIDGET_ID_COLUMN             = 10;
     private static final int WIDGET_TYPE_COLUMN           = 11;
 
-    private long mId;
-    private long mAlertDate;
-    private int mBgColorId;
-    private long mCreatedDate;
-    private boolean mHasAttachment;
-    private long mModifiedDate;
-    private int mNotesCount;
-    private long mParentId;
+    private final long mId;
+    private final long mAlertDate;
+    private final int mBgColorId;
+    private final long mCreatedDate;
+    private final boolean mHasAttachment;
+    private final long mModifiedDate;
+    private final int mNotesCount;
+    private final long mParentId;
     private String mSnippet;
-    private int mType;
-    private int mWidgetId;
-    private int mWidgetType;
+    private final int mType;
+    private final int mWidgetId;
+    private final int mWidgetType;
     private String mName;
     private String mPhoneNumber;
 
@@ -81,7 +81,7 @@ public class NoteItemData {
         mAlertDate = cursor.getLong(ALERTED_DATE_COLUMN);
         mBgColorId = cursor.getInt(BG_COLOR_ID_COLUMN);
         mCreatedDate = cursor.getLong(CREATED_DATE_COLUMN);
-        mHasAttachment = (cursor.getInt(HAS_ATTACHMENT_COLUMN) > 0) ? true : false;
+        mHasAttachment = cursor.getInt(HAS_ATTACHMENT_COLUMN) > 0;
         mModifiedDate = cursor.getLong(MODIFIED_DATE_COLUMN);
         mNotesCount = cursor.getInt(NOTES_COUNT_COLUMN);
         mParentId = cursor.getLong(PARENT_ID_COLUMN);
@@ -110,8 +110,8 @@ public class NoteItemData {
     }
 
     private void checkPostion(Cursor cursor) {
-        mIsLastItem = cursor.isLast() ? true : false;
-        mIsFirstItem = cursor.isFirst() ? true : false;
+        mIsLastItem = cursor.isLast();
+        mIsFirstItem = cursor.isFirst();
         mIsOnlyOneItem = (cursor.getCount() == 1);
         mIsMultiNotesFollowingFolder = false;
         mIsOneNoteFollowingFolder = false;

main/java/net/micode/notes/ui/NotesListActivity.java

@@ -16,6 +16,7 @@
 
 package net.micode.notes.ui;
 
+import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
@@ -93,7 +94,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
     private enum ListEditState {
         NOTE_LIST, SUB_FOLDER, CALL_RECORD_FOLDER
-    };
+    }
 
     private ListEditState mState;
 
@@ -209,6 +210,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         startAsyncNotesListQuery();
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     private void initResources() {
         mContentResolver = this.getContentResolver();
         mBackgroundQueryHandler = new BackgroundQueryHandler(this.getContentResolver());
@@ -258,13 +260,10 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             mDropDownMenu = new DropdownMenu(NotesListActivity.this,
                     (Button) customView.findViewById(R.id.selection_menu),
                     R.menu.note_list_dropdown);
-            mDropDownMenu.setOnDropdownMenuItemClickListener(new PopupMenu.OnMenuItemClickListener(){
-                public boolean onMenuItemClick(MenuItem item) {
-                    mNotesListAdapter.selectAll(!mNotesListAdapter.isAllSelected());
-                    updateMenu();
-                    return true;
-                }
-
+            mDropDownMenu.setOnDropdownMenuItemClickListener(item -> {
+                mNotesListAdapter.selectAll(!mNotesListAdapter.isAllSelected());
+                updateMenu();
+                return true;
             });
             return true;
         }
@@ -327,12 +326,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                     builder.setMessage(getString(R.string.alert_message_delete_notes,
                                              mNotesListAdapter.getSelectedCount()));
                     builder.setPositiveButton(android.R.string.ok,
-                                             new DialogInterface.OnClickListener() {
-                                                 public void onClick(DialogInterface dialog,
-                                                         int which) {
-                                                     batchDelete();
-                                                 }
-                                             });
+                            (dialog, which) -> batchDelete());
                     builder.setNegativeButton(android.R.string.cancel, null);
                     builder.show();
                     break;
@@ -348,6 +342,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
     private class NewNoteOnTouchListener implements OnTouchListener {
 
+        @SuppressLint("ClickableViewAccessibility")
         public boolean onTouch(View v, MotionEvent event) {
             switch (event.getAction()) {
                 case MotionEvent.ACTION_DOWN: {
@@ -406,7 +401,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             return false;
         }
 
-    };
+    }
 
     private void startAsyncNotesListQuery() {
         String selection = (mCurrentFolderId == Notes.ID_ROOT_FOLDER) ? ROOT_FOLDER_SELECTION
@@ -445,19 +440,16 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
         builder.setTitle(R.string.menu_title_select_folder);
         final FoldersListAdapter adapter = new FoldersListAdapter(this, cursor);
-        builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
-
-            public void onClick(DialogInterface dialog, int which) {
-                DataUtils.batchMoveToFolder(mContentResolver,
-                        mNotesListAdapter.getSelectedItemIds(), adapter.getItemId(which));
-                Toast.makeText(
-                        NotesListActivity.this,
-                        getString(R.string.format_move_notes_to_folder,
-                                mNotesListAdapter.getSelectedCount(),
-                                adapter.getFolderName(NotesListActivity.this, which)),
-                        Toast.LENGTH_SHORT).show();
-                mModeCallBack.finishActionMode();
-            }
+        builder.setAdapter(adapter, (dialog, which) -> {
+            DataUtils.batchMoveToFolder(mContentResolver,
+                    mNotesListAdapter.getSelectedItemIds(), adapter.getItemId(which));
+            Toast.makeText(
+                    NotesListActivity.this,
+                    getString(R.string.format_move_notes_to_folder,
+                            mNotesListAdapter.getSelectedCount(),
+                            adapter.getFolderName(NotesListActivity.this, which)),
+                    Toast.LENGTH_SHORT).show();
+            mModeCallBack.finishActionMode();
         });
         builder.show();
     }
@@ -471,6 +463,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
     private void batchDelete() {
         new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() {
+            @SuppressLint("StaticFieldLeak")
             protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) {
                 HashSet<AppWidgetAttribute> widgets = mNotesListAdapter.getSelectedWidget();
                 if (!isSyncMode()) {
@@ -558,12 +551,8 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
     }
 
     public void onClick(View v) {
-        switch (v.getId()) {
-            case R.id.btn_new_note:
-                createNewNote();
-                break;
-            default:
-                break;
+        if (v.getId() == R.id.btn_new_note) {
+            createNewNote();
         }
     }
 
@@ -598,43 +587,37 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         }
 
         builder.setPositiveButton(android.R.string.ok, null);
-        builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
-            public void onClick(DialogInterface dialog, int which) {
-                hideSoftInput(etName);
-            }
-        });
+        builder.setNegativeButton(android.R.string.cancel, (dialog, which) -> hideSoftInput(etName));
 
         final Dialog dialog = builder.setView(view).show();
         final Button positive = (Button)dialog.findViewById(android.R.id.button1);
-        positive.setOnClickListener(new OnClickListener() {
-            public void onClick(View v) {
-                hideSoftInput(etName);
-                String name = etName.getText().toString();
-                if (DataUtils.checkVisibleFolderName(mContentResolver, name)) {
-                    Toast.makeText(NotesListActivity.this, getString(R.string.folder_exist, name),
-                            Toast.LENGTH_LONG).show();
-                    etName.setSelection(0, etName.length());
-                    return;
-                }
-                if (!create) {
-                    if (!TextUtils.isEmpty(name)) {
-                        ContentValues values = new ContentValues();
-                        values.put(NoteColumns.SNIPPET, name);
-                        values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
-                        values.put(NoteColumns.LOCAL_MODIFIED, 1);
-                        mContentResolver.update(Notes.CONTENT_NOTE_URI, values, NoteColumns.ID
-                                + "=?", new String[] {
-                            String.valueOf(mFocusNoteDataItem.getId())
-                        });
-                    }
-                } else if (!TextUtils.isEmpty(name)) {
+        positive.setOnClickListener(v -> {
+            hideSoftInput(etName);
+            String name = etName.getText().toString();
+            if (DataUtils.checkVisibleFolderName(mContentResolver, name)) {
+                Toast.makeText(NotesListActivity.this, getString(R.string.folder_exist, name),
+                        Toast.LENGTH_LONG).show();
+                etName.setSelection(0, etName.length());
+                return;
+            }
+            if (!create) {
+                if (!TextUtils.isEmpty(name)) {
                     ContentValues values = new ContentValues();
                     values.put(NoteColumns.SNIPPET, name);
                     values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
-                    mContentResolver.insert(Notes.CONTENT_NOTE_URI, values);
+                    values.put(NoteColumns.LOCAL_MODIFIED, 1);
+                    mContentResolver.update(Notes.CONTENT_NOTE_URI, values, NoteColumns.ID
+                            + "=?", new String[] {
+                        String.valueOf(mFocusNoteDataItem.getId())
+                    });
                 }
-                dialog.dismiss();
+            } else if (!TextUtils.isEmpty(name)) {
+                ContentValues values = new ContentValues();
+                values.put(NoteColumns.SNIPPET, name);
+                values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
+                mContentResolver.insert(Notes.CONTENT_NOTE_URI, values);
             }
+            dialog.dismiss();
         });
 
         if (TextUtils.isEmpty(etName.getText())) {
@@ -650,11 +633,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             }
 
             public void onTextChanged(CharSequence s, int start, int before, int count) {
-                if (TextUtils.isEmpty(etName.getText())) {
-                    positive.setEnabled(false);
-                } else {
-                    positive.setEnabled(true);
-                }
+                positive.setEnabled(!TextUtils.isEmpty(etName.getText()));
             }
 
             public void afterTextChanged(Editable s) {
@@ -742,11 +721,7 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                 builder.setIcon(android.R.drawable.ic_dialog_alert);
                 builder.setMessage(getString(R.string.alert_message_delete_folder));
                 builder.setPositiveButton(android.R.string.ok,
-                        new DialogInterface.OnClickListener() {
-                            public void onClick(DialogInterface dialog, int which) {
-                                deleteFolder(mFocusNoteDataItem.getId());
-                            }
-                        });
+                        (dialog, which) -> deleteFolder(mFocusNoteDataItem.getId()));
                 builder.setNegativeButton(android.R.string.cancel, null);
                 builder.show();
                 break;

main/java/net/micode/notes/ui/NotesListAdapter.java

@@ -33,15 +33,15 @@ import java.util.Iterator;
 
 public class NotesListAdapter extends CursorAdapter {
     private static final String TAG = "NotesListAdapter";
-    private Context mContext;
-    private HashMap<Integer, Boolean> mSelectedIndex;
+    private final Context mContext;
+    private final HashMap<Integer, Boolean> mSelectedIndex;
     private int mNotesCount;
     private boolean mChoiceMode;
 
     public static class AppWidgetAttribute {
         public int widgetId;
         public int widgetType;
-    };
+    }
 
     public NotesListAdapter(Context context) {
         super(context, null);
@@ -92,7 +92,7 @@ public class NotesListAdapter extends CursorAdapter {
     public HashSet<Long> getSelectedItemIds() {
         HashSet<Long> itemSet = new HashSet<Long>();
         for (Integer position : mSelectedIndex.keySet()) {
-            if (mSelectedIndex.get(position) == true) {
+            if (mSelectedIndex.get(position)) {
                 Long id = getItemId(position);
                 if (id == Notes.ID_ROOT_FOLDER) {
                     Log.d(TAG, "Wrong item id, should not happen");
@@ -108,7 +108,7 @@ public class NotesListAdapter extends CursorAdapter {
     public HashSet<AppWidgetAttribute> getSelectedWidget() {
         HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
         for (Integer position : mSelectedIndex.keySet()) {
-            if (mSelectedIndex.get(position) == true) {
+            if (mSelectedIndex.get(position)) {
                 Cursor c = (Cursor) getItem(position);
                 if (c != null) {
                     AppWidgetAttribute widget = new AppWidgetAttribute();
@@ -136,7 +136,7 @@ public class NotesListAdapter extends CursorAdapter {
         Iterator<Boolean> iter = values.iterator();
         int count = 0;
         while (iter.hasNext()) {
-            if (true == iter.next()) {
+            if (iter.next()) {
                 count++;
             }
         }

main/java/net/micode/notes/ui/NotesListItem.java

@@ -31,12 +31,12 @@ import net.micode.notes.tool.ResourceParser.NoteItemBgResources;
 
 
 public class NotesListItem extends LinearLayout {
-    private ImageView mAlert;
-    private TextView mTitle;
-    private TextView mTime;
-    private TextView mCallName;
+    private final ImageView mAlert;
+    private final TextView mTitle;
+    private final TextView mTime;
+    private final TextView mCallName;
     private NoteItemData mItemData;
-    private CheckBox mCheckBox;
+    private final CheckBox mCheckBox;
 
     public NotesListItem(Context context) {
         super(context);

main/java/net/micode/notes/ui/NotesPreferenceActivity.java

@@ -18,7 +18,6 @@ package net.micode.notes.ui;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
-import android.app.ActionBar;
 import android.app.AlertDialog;
 import android.content.BroadcastReceiver;
 import android.content.ContentValues;
@@ -35,7 +34,6 @@ import android.preference.PreferenceCategory;
 import android.text.TextUtils;
 import android.text.format.DateFormat;
 import android.view.LayoutInflater;
-import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;
@@ -131,24 +129,22 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         final String defaultAccount = getSyncAccountName(this);
         accountPref.setTitle(getString(R.string.preferences_account_title));
         accountPref.setSummary(getString(R.string.preferences_account_summary));
-        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
-            public boolean onPreferenceClick(Preference preference) {
-                if (!GTaskSyncService.isSyncing()) {
-                    if (TextUtils.isEmpty(defaultAccount)) {
-                        // the first time to set account
-                        showSelectAccountAlertDialog();
-                    } else {
-                        // if the account has already been set, we need to promp
-                        // user about the risk
-                        showChangeAccountConfirmAlertDialog();
-                    }
+        accountPref.setOnPreferenceClickListener(preference -> {
+            if (!GTaskSyncService.isSyncing()) {
+                if (TextUtils.isEmpty(defaultAccount)) {
+                    // the first time to set account
+                    showSelectAccountAlertDialog();
                 } else {
-                    Toast.makeText(NotesPreferenceActivity.this,
-                            R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
-                            .show();
+                    // if the account has already been set, we need to promp
+                    // user about the risk
+                    showChangeAccountConfirmAlertDialog();
                 }
-                return true;
+            } else {
+                Toast.makeText(NotesPreferenceActivity.this,
+                        R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
+                        .show();
             }
+            return true;
         });
 
         mAccountCategory.addPreference(accountPref);
@@ -161,18 +157,10 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         // set button state
         if (GTaskSyncService.isSyncing()) {
             syncButton.setText(getString(R.string.preferences_button_sync_cancel));
-            syncButton.setOnClickListener(new View.OnClickListener() {
-                public void onClick(View v) {
-                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this);
-                }
-            });
+            syncButton.setOnClickListener(v -> GTaskSyncService.cancelSync(NotesPreferenceActivity.this));
         } else {
             syncButton.setText(getString(R.string.preferences_button_sync_immediately));
-            syncButton.setOnClickListener(new View.OnClickListener() {
-                public void onClick(View v) {
-                    GTaskSyncService.startSync(NotesPreferenceActivity.this);
-                }
-            });
+            syncButton.setOnClickListener(v -> GTaskSyncService.startSync(NotesPreferenceActivity.this));
         }
         syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));
 
@@ -228,12 +216,10 @@ public class NotesPreferenceActivity extends PreferenceActivity {
                 items[index++] = account.name;
             }
             dialogBuilder.setSingleChoiceItems(items, checkedItem,
-                    new DialogInterface.OnClickListener() {
-                        public void onClick(DialogInterface dialog, int which) {
-                            setSyncAccount(itemMapping[which].toString());
-                            dialog.dismiss();
-                            refreshUI();
-                        }
+                    (dialog, which) -> {
+                        setSyncAccount(itemMapping[which].toString());
+                        dialog.dismiss();
+                        refreshUI();
                     });
         }
 
@@ -241,16 +227,14 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         dialogBuilder.setView(addAccountView);
 
         final AlertDialog dialog = dialogBuilder.show();
-        addAccountView.setOnClickListener(new View.OnClickListener() {
-            public void onClick(View v) {
-                mHasAddedAccount = true;
-                Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
-                intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] {
-                    "gmail-ls"
-                });
-                startActivityForResult(intent, -1);
-                dialog.dismiss();
-            }
+        addAccountView.setOnClickListener(v -> {
+            mHasAddedAccount = true;
+            Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
+            intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] {
+                "gmail-ls"
+            });
+            startActivityForResult(intent, -1);
+            dialog.dismiss();
         });
     }
 
@@ -270,14 +254,12 @@ public class NotesPreferenceActivity extends PreferenceActivity {
                 getString(R.string.preferences_menu_remove_account),
                 getString(R.string.preferences_menu_cancel)
         };
-        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {
-            public void onClick(DialogInterface dialog, int which) {
-                if (which == 0) {
-                    showSelectAccountAlertDialog();
-                } else if (which == 1) {
-                    removeSyncAccount();
-                    refreshUI();
-                }
+        dialogBuilder.setItems(menuItemArray, (dialog, which) -> {
+            if (which == 0) {
+                showSelectAccountAlertDialog();
+            } else if (which == 1) {
+                removeSyncAccount();
+                refreshUI();
             }
         });
         dialogBuilder.show();
@@ -303,13 +285,11 @@ public class NotesPreferenceActivity extends PreferenceActivity {
             setLastSyncTime(this, 0);
 
             // clean up local gtask related info
-            new Thread(new Runnable() {
-                public void run() {
-                    ContentValues values = new ContentValues();
-                    values.put(NoteColumns.GTASK_ID, "");
-                    values.put(NoteColumns.SYNC_ID, 0);
-                    getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
-                }
+            new Thread(() -> {
+                ContentValues values = new ContentValues();
+                values.put(NoteColumns.GTASK_ID, "");
+                values.put(NoteColumns.SYNC_ID, 0);
+                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
             }).start();
 
             Toast.makeText(NotesPreferenceActivity.this,
@@ -330,13 +310,11 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         editor.commit();
 
         // clean up local gtask related info
-        new Thread(new Runnable() {
-            public void run() {
-                ContentValues values = new ContentValues();
-                values.put(NoteColumns.GTASK_ID, "");
-                values.put(NoteColumns.SYNC_ID, 0);
-                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
-            }
+        new Thread(() -> {
+            ContentValues values = new ContentValues();
+            values.put(NoteColumns.GTASK_ID, "");
+            values.put(NoteColumns.SYNC_ID, 0);
+            getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
         }).start();
     }
 
@@ -375,14 +353,12 @@ public class NotesPreferenceActivity extends PreferenceActivity {
     }
 
     public boolean onOptionsItemSelected(MenuItem item) {
-        switch (item.getItemId()) {
-            case android.R.id.home:
-                Intent intent = new Intent(this, NotesListActivity.class);
-                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
-                startActivity(intent);
-                return true;
-            default:
-                return false;
+        if (item.getItemId() == android.R.id.home) {
+            Intent intent = new Intent(this, NotesListActivity.class);
+            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+            startActivity(intent);
+            return true;
         }
+        return false;
     }
 }

main/java/net/micode/notes/widget/NoteWidgetProvider.java

@@ -49,11 +49,11 @@ public abstract class NoteWidgetProvider extends AppWidgetProvider {
     public void onDeleted(Context context, int[] appWidgetIds) {
         ContentValues values = new ContentValues();
         values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
-        for (int i = 0; i < appWidgetIds.length; i++) {
+        for (int appWidgetId : appWidgetIds) {
             context.getContentResolver().update(Notes.CONTENT_NOTE_URI,
                     values,
                     NoteColumns.WIDGET_ID + "=?",
-                    new String[] { String.valueOf(appWidgetIds[i])});
+                    new String[]{String.valueOf(appWidgetId)});
         }
     }
 
@@ -71,19 +71,22 @@ public abstract class NoteWidgetProvider extends AppWidgetProvider {
 
     private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
             boolean privacyMode) {
-        for (int i = 0; i < appWidgetIds.length; i++) {
-            if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
+        /**
+         * Generate the pending intent to start host for the widget
+         */
+        for (int appWidgetId : appWidgetIds) {
+            if (appWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID) {
                 int bgId = ResourceParser.getDefaultBgId(context);
                 String snippet = "";
                 Intent intent = new Intent(context, NoteEditActivity.class);
                 intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
-                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetId);
                 intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());
 
-                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
+                Cursor c = getNoteWidgetInfo(context, appWidgetId);
                 if (c != null && c.moveToFirst()) {
                     if (c.getCount() > 1) {
-                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
+                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetId);
                         c.close();
                         return;
                     }
@@ -110,16 +113,16 @@ public abstract class NoteWidgetProvider extends AppWidgetProvider {
                 if (privacyMode) {
                     rv.setTextViewText(R.id.widget_text,
                             context.getString(R.string.widget_under_visit_mode));
-                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetId, new Intent(
                             context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
                 } else {
                     rv.setTextViewText(R.id.widget_text, snippet);
-                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetId, intent,
                             PendingIntent.FLAG_UPDATE_CURRENT);
                 }
 
                 rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
-                appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
+                appWidgetManager.updateAppWidget(appWidgetId, rv);
             }
         }
     }