Update NotesProvider.java

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

@@ -33,11 +33,10 @@ import net.micode.notes.R;
 import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.NoteColumns;
 import net.micode.notes.data.NotesDatabaseHelper.TABLE;
-//为存储和获取数据提供接口。可以在不同的应用程序之间共享数据
 
-public class NotesProvider extends ContentProvider {
+public class NotesProvider extends ContentProvider {//为存储和获取数据提供接口。可以在不同的应用程序之间共享数据
-    // UriMatcher用于匹配Uri
+    
-    private static final UriMatcher mMatcher;
+    private static final UriMatcher mMatcher;// UriMatcher用于匹配Uri
 
     private NotesDatabaseHelper mHelper;
 
@@ -52,10 +51,8 @@ public class NotesProvider extends ContentProvider {
     private static final int URI_SEARCH_SUGGEST  = 6;
 
     static {
-        // 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);// 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
-        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);// 把需要匹配Uri路径全部给注册上
-        // 把需要匹配Uri路径全部给注册上
-        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
         mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
         mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
         mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
@@ -68,35 +65,33 @@ public class NotesProvider extends ContentProvider {
      * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
      * we will trim '\n' and white space in order to show more information.
      */
-    // 声明 NOTES_SEARCH_PROJECTION
+    
-    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","// 声明 NOTES_SEARCH_PROJECTION
         + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
         + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
         + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
         + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
         + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
         + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
-    // 声明NOTES_SNIPPET_SEARCH_QUERY
+    
-    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION// 声明NOTES_SNIPPET_SEARCH_QUERY
         + " FROM " + TABLE.NOTE
         + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
         + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
         + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
 
     @Override
-    // Context只有在onCreate()中才被初始化
+    
-    // 对mHelper进行实例化
+    public boolean onCreate() {// Context只有在onCreate()中才被初始化
-    public boolean onCreate() {
+        mHelper = NotesDatabaseHelper.getInstance(getContext());// 对mHelper进行实例化
-        mHelper = NotesDatabaseHelper.getInstance(getContext());
         return true;
     }
     @Override
-    // 查询uri在数据库中对应的位置
+    
-    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,// 查询uri在数据库中对应的位置
             String sortOrder) {
         Cursor c = null;
-        // 获取可读数据库
+        SQLiteDatabase db = mHelper.getReadableDatabase();// 获取可读数据库
-        SQLiteDatabase db = mHelper.getReadableDatabase();
         String id = null;
 			// 匹配查找uri
         switch (mMatcher.match(uri)) {