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我正在尝试从 UserDicionary 查询单词,但没有返回任何内容。我做错了什么?

这是我的代码:

Cursor cursor = getContentResolver().query(UserDictionary.Words.CONTENT_URI, 
                new String[] {UserDictionary.Words.WORD}, null, null, null);

        cursor.moveToFirst();

        while(cursor.moveToNext())
        {
                        //nothing is logged...
            Log.d("Palavra", cursor.getString(0));          
        }
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