Android使用數據綁定庫與CursorAdapter

Question

我想使用Android數據綁定庫ListView由自定義CursorAdapter填充，但我不知道如何得到它的工作。我看起來很容易實現。

這是我現在有：

public class PlayCursorAdapter extends CursorAdapter { 
    private List<Play> mPlays; 

    PlayCursorAdapter(Context context, Cursor cursor) { 
     super(context, cursor, 0); 
     mPlays = new ArrayList<>(); 
    } 

    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup parent) { 
     ListItemPlayBinding binding = ListItemPlayBinding.inflate(LayoutInflater.from(context), parent, false); 
     Play play = new Play(); 
     binding.setPlay(play); 
     mPlays.add(play); 
     return binding.getRoot(); 
    } 

    @Override 
    public void bindView(View view, Context context, Cursor cursor) { 
     int timeIndex = cursor.getColumnIndexOrThrow(PlayEntry.COLUMN_TIME); 
     ... 

     long time = cursor.getLong(timeIndex); 
     ... 

     Play play = mPlays.get(cursor.getPosition()); 

     play.setTime(time); 
     ... 
    } 
} 

當前的行爲：
當我運行這段代碼，我在列表中向下滾動我上mPlays一個IndexOutOfBoundsException列表。

期望的行爲：
我想從ContentProvider使用數據綁定庫和CursorAdapter用數據填充ListView。數據綁定庫甚至可以使用CursorAdapter？或者您是否建議始終使用RecyclerView和RecyclerView.Adapter？

Answer 1

您應該能夠通過消除mPlays列表，以避免問題：

public class PlayCursorAdapter extends CursorAdapter { 
    PlayCursorAdapter(Context context, Cursor cursor) { 
     super(context, cursor, 0); 
    } 

    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup parent) { 
     ListItemPlayBinding binding = ListItemPlayBinding.inflate(LayoutInflater.from(context), parent, false); 
     Play play = new Play(); 
     binding.setPlay(play); 
     return binding.getRoot(); 
    } 

    @Override 
    public void bindView(View view, Context context, Cursor cursor) { 
     int timeIndex = cursor.getColumnIndexOrThrow(PlayEntry.COLUMN_TIME); 
     ... 

     long time = cursor.getLong(timeIndex); 
     ... 
     ListItemPlayBinding binding = DataBindingUtil.getBinding(view); 
     Play play = binding.getPlay(); 

     play.setTime(time); 
     ... 
    } 
} 

這是假設你不就是想每次bindView（）來實例化一個新的播放。