Question

我想使用自定义ListView填充CursorAdapter的Android数据绑定库，但我无法弄清楚如何让它工作。我似乎很容易实现。

这就是我现在所拥有的：

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);
        ...
    }
}

当前行为：
当我运行此代码并向下滚动列表时，我会在 mPlays 列表中获得IndexOutOfBoundsException。

所需行为
我想使用数据绑定库和ListView使用来自ContentProvider的数据填充CursorAdapter。是否可以将数据绑定库与CursorAdapter一起使用？或者，您是否建议始终使用RecyclerView和RecyclerView.Adapter？

Answer 1

您应该可以通过删除mPlays列表来避免此问题：

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);
        ...
    }
}

这假设您不仅希望每次bindView（）时都实例化一个新的Play。

Android使用数据绑定库和CursorAdapter

1 个答案: