無法從CursorWindow SQLite讀取第0行第5列Android

我在查詢我的SQLite Database從WidgetRemoteService。數據庫已經正確存儲。我無法從數據庫檢索url字符串。無法從CursorWindow SQLite讀取第0行第5列Android

這就是我對我的logcat

E/UncaughtException: java.lang.IllegalStateException: Couldn't read row 0, col 5 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 
                      at android.database.CursorWindow.nativeGetString(Native Method) 
                      at android.database.CursorWindow.getString(CursorWindow.java:438) 
                      at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51) 
                      at android.database.CursorWrapper.getString(CursorWrapper.java:137) 
                      at io.wyntr.peepster.widget.DetailWidgetRemoteService$1.getViewAt(DetailWidgetRemoteService.java:101) 
                      at android.widget.RemoteViewsService$RemoteViewsFactoryAdapter.getViewAt(RemoteViewsService.java:164) 
                      at com.android.internal.widget.IRemoteViewsFactory$Stub.onTransact(IRemoteViewsFactory.java:85) 
                      at android.os.Binder.execTransact(Binder.java:453)

這是我在WidgetIntentService

private static final String[] FEEDS_COLUMNS = { 
      FeedsContract.FeedsEntry.TABLE_NAME + "." + FeedsContract.FeedsEntry._ID, 
      FeedsContract.FeedsEntry.COLUMN_USER, 
      FeedsContract.FeedsEntry.COLUMN_POST_KEY, 
      FeedsContract.FeedsEntry.COLUMN_THUMB, 

    }; 

    static final int INDEX_FEED_ID = 0; 
    static final int INDEX_USER_NAME = 1; 
    static final int INDEX_FEEDS_THUMB = 4; 
    static final int INDEX_FEED_KEY = 5; 

@Override 
      public void onDataSetChanged() { 
       if (data != null) { 
        data.close(); 
       } 
       final long identityToken = Binder.clearCallingIdentity(); 
       data = getContentResolver().query(FeedsContract.FeedsEntry.CONTENT_URI, 
         FEEDS_COLUMNS, 
         null, 
         null, 
         null); 
       Binder.restoreCallingIdentity(identityToken); 
      } 

@Override 
      public RemoteViews getViewAt(int position) { 
       if (position == AdapterView.INVALID_POSITION || 
         data == null || !data.moveToPosition(position)) { 
        return null; 
       } 
       RemoteViews views = new RemoteViews(getPackageName(), 
         R.layout.widget_items); 
       String thumbId = data.getString(INDEX_FEEDS_THUMB); 
       Bitmap feedsImage = null; 
       try { 
        feedsImage = Glide.with(DetailWidgetRemoteService.this) 
          .load(thumbId) 
          .asBitmap() 
          .error(R.drawable.person_placeholder) 
          .into(150, 150).get(); 
       } catch (InterruptedException | ExecutionException e) { 
        e.printStackTrace(); 
       }

查詢這是我的合同類

public static final class FeedsEntry implements BaseColumns { 

    public static final Uri CONTENT_URI = 
      BASE_CONTENT_URI.buildUpon().appendPath(PATH_FEEDS).build(); 
    public static final String CONTENT_TYPE = 
      ContentResolver.CURSOR_DIR_BASE_TYPE + "/" + CONTENT_AUTHORITY + "/" + PATH_FEEDS; 
    public static final String CONTENT_ITEM_TYPE = 
      ContentResolver.CURSOR_ITEM_BASE_TYPE + "/" + CONTENT_AUTHORITY + "/" + PATH_FEEDS; 
    public static final String TABLE_NAME = "feeds"; 
    public static final String COLUMN_USER = "username"; 
    public static final String COLUMN_VIDEO = "video"; 
    public static final String COLUMN_TIME_STAMP = "timestamp"; 
    public static final String COLUMN_THUMB = "thumb"; 
    public static final String COLUMN_POST_KEY = "key"; 
    public static final String COLUMN_USER_PROFILE = "profile";

來源

2017-03-06 Contextioner

@pskink共7行 – Contextioner

@pskink你可以檢查我現在已經上傳的logcat – Contextioner

當你發問Y，光標只返回查詢列，因此，如果您查詢這些列：

static final int INDEX_FEED_ID = 0; 
static final int INDEX_USER_NAME = 1; 
static final int INDEX_FEEDS_THUMB = 4; 
static final int INDEX_FEED_KEY = 5;

，那麼你可以從遊標使用data.getString(index)訪問它們其中

INDEX_FEED_ID - index 0 
INDEX_USER_NAME - index 1 
INDEX_FEEDS_THUMB - index 2 
INDEX_FEED_KEY - index 3

來源

2017-03-07 14:38:25 Kacper

無法從CursorWindow SQLite讀取第0行第5列Android

回答

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