我正在尝试使用 LoaderCallBacks 从数据库中加载数据。但是不会调用 loadercallbacks 中的 onLoadFinished 函数。因此,正如您在日志中看到的那样,返回的行数为 1,但列表未显示任何条目,也没有调用 onLoadFinished,如您所见。
系列片段
公共类 SerieFragment 扩展了 SherlockListFragment 实现 LoaderCallbacks { 私有 SimpleCursorAdapter 适配器; @覆盖 公共无效 onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); String[] from = new String[] { DBContract.Episodes.NAME }; int[] to = new int[] { R.id.name }; Log.i("LoaderManager", "正在启动..."); getLoaderManager().initLoader(0, null, this); 适配器 = 新的 SimpleCursorAdapter(getActivity(), R.layout.serie_list_item,空,从,到,0); this.setListAdapter(适配器); } @覆盖 public void onViewCreated(View view, Bundle savedInstanceState) { } @覆盖 公共加载器 onCreateLoader(int id, Bundle args) { Log.i("LoaderManager", "正在创建加载器..."); 字符串 [] 投影 = { DBContract.Episodes._ID, DBContract.Episodes.NAME }; CursorLoader cursorLoader = new CursorLoader(this.getActivity(), Uri.parse(SerieProvider.CONTENT_URI + "/episodes"), 投影, 空,空,空); 返回游标加载器; } @覆盖 public void onLoadFinished(Loader loader, Cursor cursor) { Log.i("LoaderManager", "完成加载条目... - 光标:" + cursor.getCount()); 适配器.swapCursor(光标); } @覆盖 公共无效onLoaderReset(加载器加载器){ Log.i("LoaderManager", "正在重置加载器..."); 适配器.swapCursor(null); }
内容提供商
公共类 SerieProvider 扩展 ContentProvider { 私有静态 DatabaseHelper 数据库; private static final String PROVIDER = "com.drizzlyday.apps.episotron.providers"; 私有静态最终字符串 BASE_PATH = "serieprovider"; 公共静态最终 Uri CONTENT_URI = Uri.parse("content://" + PROVIDER + "/" + BASE_PATH); 公共静态最终 int 系列 = 1; 公共静态最终 int EPISODES = 2; 私有静态最终 UriMatcher uriMatcher; 静止的 { uriMatcher = 新的 UriMatcher(UriMatcher.NO_MATCH); uriMatcher.addURI(PROVIDER, BASE_PATH, SERIES); uriMatcher.addURI(PROVIDER, BASE_PATH + "/episodes", EPISODES); } @覆盖 公共布尔 onCreate() { 数据库 = 新的 DatabaseHelper(getContext()); 返回假; } @覆盖 公共 int 删除(Uri uri,字符串选择,字符串 [] selectionArgs){ // TODO 自动生成的方法存根 返回0; } @覆盖 公共字符串getType(Uri uri){ // TODO 自动生成的方法存根 返回空值; } @覆盖 公共 Uri 插入(Uri uri,ContentValues 值){ // TODO 自动生成的方法存根 返回空值; } @覆盖 公共游标查询(Uri uri,String[] 投影,字符串选择, String[] selectionArgs, String sortOrder) { Log.d("提供者", uri.toString()); SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder(); int uriType = uriMatcher.match(uri); 开关(uriType){ 案例系列: Log.d("提供者", "系列"); queryBuilder.setTables(DBContract.Series.TABLE_NAME); 休息; 案例情节: Log.d("提供者", "剧集"); queryBuilder.setTables(DBContract.Episodes.TABLE_NAME); 休息; 默认: throw new IllegalArgumentException("未知 URI:" + uri); } SQLiteDatabase db = database.getReadableDatabase(); SQLiteCursor cursor = (SQLiteCursor) queryBuilder.query(db, projection, 选择, selectionArgs, null, null, sortOrder); cursor.setNotificationUri(getContext().getContentResolver(), uri); Log.d("Provider", "Cursor:" + cursor.toString() + " - 列数:" + cursor.getColumnCount() + " - 行数:" + cursor.getCount()); 返回光标; } @覆盖 公共 int 更新(Uri uri,ContentValues 值,字符串选择, 字符串 [] 选择参数){ // TODO 自动生成的方法存根 返回0; }
05-05 23:34:30.855: I/ActivityThread(31903): Pub com.drizzlyday.apps.episotron.providers: com.drizzlyday.apps.episotron.providers.SerieProvider
05-05 23:34:31.035: D/Serie(31903): New Serie fragment
05-05 23:34:31.040: I/LoaderManager(31903): Starting...
05-05 23:34:31.040: I/LoaderManager(31903): Creating loader...
05-05 23:34:31.055: D/AbsListView(31903): Get MotionRecognitionManager
05-05 23:34:31.060: D/AbsListView(31903): Get MotionRecognitionManager
05-05 23:34:31.080: D/dalvikvm(31903): GC_CONCURRENT freed 174K, 8% free 12340K/13383K, paused 2ms+2ms, total 16ms
05-05 23:34:31.090: D/Provider(31903): content://com.drizzlyday.apps.episotron.providers/serieprovider/episodes
05-05 23:34:31.090: D/Provider(31903): Episodes
05-05 23:34:31.100: V/SlidingMenu(31903): setting padding!
05-05 23:34:31.160: D/libEGL(31903): loaded /system/lib/egl/libEGL_mali.so
05-05 23:34:31.175: D/libEGL(31903): loaded /system/lib/egl/libGLESv1_CM_mali.so
05-05 23:34:31.175: D/libEGL(31903): loaded /system/lib/egl/libGLESv2_mali.so
05-05 23:34:31.180: D/(31903): Device driver API match
05-05 23:34:31.180: D/(31903): Device driver API version: 10
05-05 23:34:31.180: D/(31903): User space API version: 10
05-05 23:34:31.180: D/(31903): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012
05-05 23:34:31.210: D/OpenGLRenderer(31903): Enabling debug mode 0
05-05 23:34:31.215: V/CustomViewBehind(31903): behind INVISIBLE
05-05 23:34:31.260: D/Provider(31903): Cursor: android.database.sqlite.SQLiteCursor@41b0df88 - Columncount: 2 - Rowcount: 1