Out of Memory when allocating cursors
The call to cursor.close() should be in a finally block in case an exception is thrown while you're iterating over it.
Cursor cursor = mDatabase.query("nodes", null, "level = " + wrapSql(String.valueOf(level.getId())), null, null, null, null);try { while (cursor.moveToNext()) { l.add(parseNodeFromCursor(cursor)); }} finally { cursor.close();}
One of the reasons for occurring Out of Memory error is you are not closing your cursor.
As I can see, you are calling cursor.close(), but is it the right place where you should call this method or check if you should close it on some other place.
EDIT:
If your activity is managing your Cursor, you may consider stop managing it and closing everything in the onPause method, and in onResume open everything up and fillData once again.