首先,我整天都在努力,但无法完成任何事情.我有一个带有适配器的RecyclerView,它使用RecyclerView的SortedList.我尝试使用回调类实现TouchHelper：

public class TimerListTouchHelperCallback extends ItemTouchHelper.SimpleCallback {

    private OnItemChangeListener onItemChangeListener;

    public TimerListTouchHelperCallback(OnItemChangeListener listener,int dragDirs,int swipeDirs) {
        super(dragDirs,swipeDirs);

        this.onItemChangeListener = listener;

    }

    @Override
    public int getSwipeDirs(RecyclerView recyclerView,RecyclerView.ViewHolder viewHolder) {
        TimerHolder holder = (TimerHolder) viewHolder;

        int holderState = holder.getState();

        if (holderState == TimerHolder.TIMER_PENDING_DELETE) return 0;
        else return super.getSwipeDirs(recyclerView,viewHolder);
    }

    @Override
    public boolean onMove(RecyclerView recyclerView,RecyclerView.ViewHolder viewHolder,RecyclerView.ViewHolder target) {
        return false;
    }




    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder,int swipeDir) {
        TimerHolder holder = (TimerHolder) viewHolder;

        int position = holder.getAdapterPosition();
        // ViewHolder's state is changed that should handle the layout change.
        holder.setState(TimerHolder.TIMER_PENDING_DELETE); 

        if (onItemChangeListener != null) onItemChangeListener.onItemSwiped(position);
    }


    protected interface OnItemChangeListener{
        void onItemSwiped(int position);
    }
}

这是TouchHelper的初始化

timerAdapter = new TimerAdapter(this,timerList);
    timerListView.setAdapter(timerAdapter);

TimerListTouchHelperCallback touchHelperCallback = new TimerListTouchHelperCallback(
        timerAdapter,ItemTouchHelper.LEFT,ItemTouchHelper.LEFT);

ItemTouchHelper swipeToDismissTouchHelper = new ItemTouchHelper(touchHelperCallback);

swipeToDismissTouchHelper.attachToRecyclerView(timerListView);

我的适配器实现了OnItemChangeListener接口

@Override
public void onItemSwiped(int position) {
    notifyItemChanged(position);
    removalPendingTimers.add(timerList.get(position));
}

我的ViewHolder读取状态,当状态为TimerHolder.TIMER_PENDING_DELETE时,它会隐藏视图的其余部分并显示带有撤消按钮的界面.但是直到我滚动视图并再次向后滚动它才会发生这种情况.有什么建议我缺少什么？

链接

Adapter class
ViewHolder class