new annotation

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

@@ -39,28 +39,29 @@ public class DataUtils {
     public static final String TAG = "DataUtils";
     public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {
         if (ids == null) {
-            Log.d(TAG, "the ids is null");
+            Log.d(TAG, "the ids is null");//IDS是空
             return true;
         }
         if (ids.size() == 0) {
-            Log.d(TAG, "no id is in the hashset");
+            Log.d(TAG, "no id is in the hashset");//hash集里没有ID
             return true;
         }
 
         ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
         for (long id : ids) {
             if(id == Notes.ID_ROOT_FOLDER) {
-                Log.e(TAG, "Don't delete system folder root");
+                Log.e(TAG, "Don't delete system folder root");//不删除根文件
                 continue;
             }
             ContentProviderOperation.Builder builder = ContentProviderOperation
-                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));//实现删除功能
             operationList.add(builder.build());
         }
         try {
             ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            //唯一标识这个ContentProvider，起标记作用
             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.toString());//提示删除失败并返回IDS
                 return false;
             }
             return true;
@@ -78,28 +79,30 @@ public class DataUtils {
         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);
+      //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,
             long folderId) {
         if (ids == null) {
-            Log.d(TAG, "the ids is null");
+            Log.d(TAG, "the ids is null");//IDS为空
             return true;
         }
 
         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);
+          //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.toString());//删除失败并返回IDS
                 return false;
             }
             return true;
@@ -119,7 +122,7 @@ 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) {
@@ -127,28 +130,29 @@ 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.toString());//获取文件夹计数失败
                 } finally {
-                    cursor.close();
+                    cursor.close();//释放
                 }
             }
         }
-        return count;
+        return count;//返回计数
     }
 
     public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
         Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
-                null,
+                //为Uri加上ID
+        		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) {
                 exist = true;
-            }
+            }//判断cursor是否为空
-            cursor.close();
+            cursor.close();//释放
         }
         return exist;
     }
@@ -162,7 +166,7 @@ public class DataUtils {
             if (cursor.getCount() > 0) {
                 exist = true;
             }
-            cursor.close();
+            cursor.close();//释放
         }
         return exist;
     }
@@ -171,14 +175,14 @@ public class DataUtils {
         Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
                 null, null, null, null);
 
-        boolean exist = false;
+        boolean exist = false;//设置条件值
         if (cursor != null) {
             if (cursor.getCount() > 0) {
-                exist = true;
+                exist = true;//count存在
             }
-            cursor.close();
+            cursor.close();//释放
         }
-        return exist;
+        return exist;//count是否存在
     }
 
     public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
@@ -186,15 +190,15 @@ public class DataUtils {
                 NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER +
                 " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
                 " AND " + NoteColumns.SNIPPET + "=?",
-                new String[] { name }, null);
+                new String[] { name }, null);//通过名字查询文件是否存在
-        boolean exist = false;
+        boolean exist = false;//设置条件值
         if(cursor != null) {
             if(cursor.getCount() > 0) {
                 exist = true;
             }
-            cursor.close();
+            cursor.close();//关闭
         }
-        return exist;
+        return exist;//是否存在
     }
 
     public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
@@ -202,7 +206,7 @@ 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) {
@@ -211,15 +215,15 @@ public class DataUtils {
                 do {
                     try {
                         AppWidgetAttribute widget = new AppWidgetAttribute();
-                        widget.widgetId = c.getInt(0);
+                        widget.widgetId = c.getInt(0);//0对应的NoteColumns.WIDGET_ID
-                        widget.widgetType = c.getInt(1);
+                        widget.widgetType = c.getInt(1);//1对应的NoteColumns.WIDGET_TYPE
-                        set.add(widget);
+                        set.add(widget);//添加界面
                     } catch (IndexOutOfBoundsException e) {
                         Log.e(TAG, e.toString());
                     }
-                } while (c.moveToNext());
+                } while (c.moveToNext());//查询下一条直到全部
             }
-            c.close();
+            c.close();//释放
         }
         return set;
     }
@@ -235,9 +239,9 @@ 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.toString());//获取呼叫号码失败
             } finally {
-                cursor.close();
+                cursor.close();//释放
             }
         }
         return "";
@@ -249,17 +253,17 @@ public class DataUtils {
                 CallNote.CALL_DATE + "=? AND " + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
                 + CallNote.PHONE_NUMBER + ",?)",
                 new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
-                null);
+                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.toString());//获取呼叫便签ID失败
                 }
             }
-            cursor.close();
+            cursor.close();//释放
         }
         return 0;
     }
@@ -269,17 +273,17 @@ 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 = "";
             if (cursor.moveToFirst()) {
                 snippet = cursor.getString(0);
-            }
+            }//如果移到第一位
-            cursor.close();
+            cursor.close();//释放
             return snippet;
         }
-        throw new IllegalArgumentException("Note is not found with id: " + noteId);
+        throw new IllegalArgumentException("Note is not found with id: " + noteId);//找不到便签的ID
     }
 
     public static String getFormattedSnippet(String snippet) {
@@ -291,5 +295,5 @@ public class DataUtils {
             }
         }
         return 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
 }