Make sure the Cursor is initialized correctly before accessing data from it

Question

Im trying to get data from my DB.

This is my code:

String[] columns = new String[] {COLUMN_FACEBOOK_ALBUM_COVER, COLUMN_FACEBOOK_ALBUM_IS_ACTIVE};

          


        

Answer 1

Initialize cursors in database transaction.

Cursor cAlbum = null, cImage = null;
db.beginTransaction();
try {
    // init cursors
    cAlbum = db.query(...);
    cImage = db.query(...);
} catch(SQLException e) {
    e.printStackTrace();
} finally {
    db.endTransaction();
}

Check if cursors are not null.

if(cAlbum != null && cImage != null) {
    while(cAlbum.moveToNext()) {
        // get data from cAlbum and do what you need
    }
    while(cImage.moveToNext()) {
        // get data from cImage and do what you need
    }

    cAlbum.close();
    cImage.close();
}