Android 使用editText和SimpleCorsorAdapter筛选listview

我正在尝试筛选listView中的项目，但它不起作用。我的代码似乎没有响应editText中输入的文本

这是我的SearchActivity类（MainActivity）

这是我的getDirectoryList

public Cursor getDirectoryList (CharSequence constraint)  {
    SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
    queryBuilder.setTables(DB_NAME);

    String[] columns = new String[]{KEY_ID, KEY_CONTENT, KEY_DESCRIPTION, KEY_NETWORKING, KEY_HARDWARE, KEY_SOFTWARE, KEY_INTERNET, KEY_TECHNOLOGY};

    if (constraint == null  ||  constraint.length () == 0)  {
        //  Return the full list
            Cursor cursor = myDataBase.query("MY_TABLE", 
             columns, null, null, null, null, null);
            return cursor;
    }  else  {
            String value = constraint.toString()+"%";
            Cursor cursor2 = myDataBase.query("MY_TABLE", columns, "KEY_CONTENT like ?", new String[]{value}, null, null, null);
            return cursor2;
        }
    }
}

public Cursor getDirectoryList (CharSequence constraint)  {
    SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
    queryBuilder.setTables(DB_NAME);

    String[] columns = new String[]{KEY_ID, KEY_CONTENT, KEY_DESCRIPTION, KEY_NETWORKING, KEY_HARDWARE, KEY_SOFTWARE, KEY_INTERNET, KEY_TECHNOLOGY};

    if (constraint == null  ||  constraint.length () == 0)  {
        //  Return the full list
            Cursor cursor = myDataBase.query("MY_TABLE", 
             columns, null, null, null, null, null);
            return cursor;
    }  else  {
            String value = constraint.toString()+"%";
            Cursor cursor2 = myDataBase.query("MY_TABLE", columns, "KEY_CONTENT like ?", new String[]{value}, null, null, null);
            return cursor2;
        }
    }
}