RecycerView中的确认和撤消删除

Question

public class TripsAdapter extends RecyclerView.Adapter<TripsAdapter.VerticalItemHolder> {
    private List<Trip> mTrips;
    private Context mContext;
    private RecyclerView mRecyclerView;

    [...]

    //Let adapter know his RecyclerView. Attaching ItemTouchHelper
    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new TripItemTouchHelperCallback());
        itemTouchHelper.attachToRecyclerView(recyclerView);
        mRecyclerView = recyclerView;
    }

    [...]

    public class TripItemTouchHelperCallback extends ItemTouchHelper.SimpleCallback {
        public  TripItemTouchHelperCallback (){
            super(ItemTouchHelper.UP | ItemTouchHelper.DOWN, ItemTouchHelper.RIGHT);
        }

        @Override
        public boolean onMove(RecyclerView recyclerView,
                              RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
            //some "move" implementation
        }
        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {
            //AND WHAT HERE?
        }
    }
}

很管用。然而，我也需要执行一些撤消操作或确认。做这件事最好的方法是什么？

第一个问题是如何插入另一个视图代替删除与确认对话框？如果用户选择撤消删除，如何恢复被刷的项目？

Answer 1

我同意@Gabor的观点，最好软删除项目并显示撤消按钮。

然而，我使用Snackbar来显示撤消。对我来说更容易实现。

我将适配器和RecycerView实例传递给ItemTouchHelper回调。我的onSwiped很简单，大部分工作是由适配器完成的。

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
    mAdapter.onItemRemove(viewHolder, mRecyclerView);
}

   public void onItemRemove(final RecyclerView.ViewHolder viewHolder, final RecyclerView recyclerView) {
    final int adapterPosition = viewHolder.getAdapterPosition();
    final Photo mPhoto = photos.get(adapterPosition);
    Snackbar snackbar = Snackbar
            .make(recyclerView, "PHOTO REMOVED", Snackbar.LENGTH_LONG)
            .setAction("UNDO", new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int mAdapterPosition = viewHolder.getAdapterPosition();
                    photos.add(mAdapterPosition, mPhoto);
                    notifyItemInserted(mAdapterPosition);
                    recyclerView.scrollToPosition(mAdapterPosition);
                    photosToDelete.remove(mPhoto);
                }
            });
    snackbar.show();
    photos.remove(adapterPosition);
    notifyItemRemoved(adapterPosition);
    photosToDelete.add(mPhoto);
}

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