Question

我的RecyclerView有一个项目网格。单击某个项目后，它会突出显示我还想要当用户向右滑动时调用'next'方法，当用户向左滑动时，会调用'previous'方法。
但是，两者之间并没有相互影响，因为每个人都会截取对方的事件我如何让他们一起工作？

这是我的代码：

RecyclerView适配器

public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
    {
        myHolder = holder as MyView;
        myHolder.mMainView.SetOnClickListener(this);
        if (selected_position == position)
        {
            holder.ItemView.SetBackgroundColor(Color.LightGray);
        }
        else
        {
            holder.ItemView.SetBackgroundColor(Color.Transparent);
        }
   }

public void OnClick(View v)
    {
        int position = mRecyclerView.GetChildLayoutPosition((View)sender);

        // Updating old as well as new positions
        NotifyItemChanged(selected_position);
        selected_position = position;
        NotifyItemChanged(selected_position);
    }

包含RecyclerView的片段

calendarRecyclerView.SetOnTouchListener(this);

public bool OnTouch(View v, MotionEvent e)
    {
        switch (e.Action)
        {
            case MotionEventActions.Down:
                x1 = e.GetX();
                break;
            case MotionEventActions.Up:
                x2 = e.GetX();
                float deltaX = x2 - x1;
                if (Math.Abs(deltaX) > MIN_DISTANCE)
                {
                    // Left to Right swipe action
                    if (x2 > x1)
                    {
                        NextMonth();
                    }

                    // Right to left swipe action               
                    else
                    {
                        PreviousMonth();
                    }
                }


                break;
        }
        return false;
    }

因为我将return false放入OnTouch事件中，所以会触发项目的click事件。但是，MouseTown事件不会在OnTouch中触发，从而阻止向后扫描检测（因为x1始终为0）。

Answer 1

首次点击时会调用OnTouch事件，只有在第二次点击时才会调用OnClick

因为MotionEventActions.Down和OnClick发生冲突。作为解决方法，我建议您更改MotionEventActions.Down事件的背景颜色。

创建您自己的点击监听器
当您触摸项目时，请致电听众。
监听器将回调MainActivity以通知更改的项目。
同时触摸事件将被调用。

我在视图中设置了OnTouchListener：

public class MyViewHolder:RecyclerView.ViewHolder,IOnTouchListener
{
    private TextView textView;
    private MyItemClickListener mListener;
    private Context myContext;
    float x1 = 0;
    float x2 = 0;
    public TextView TextView { get { return textView; } }
    public MyViewHolder(View v, MyItemClickListener mItemClickListener) : base(v)
    {
        textView = v.FindViewById<TextView>(Resource.Id.itemText);
        mListener = mItemClickListener;
        v.SetOnTouchListener(this);
    }

    public MyViewHolder(View v, MyItemClickListener mItemClickListener, Context myContext) : this(v, mItemClickListener)
    {
        this.myContext = myContext;
    }
    public bool OnTouch(View v, MotionEvent e)
    {

        switch (e.Action)
        {
            case MotionEventActions.Down:
                x1 = e.GetX();
                if (mListener != null)
                {
                    mListener.OnItemClick(v, Position);
                }
                break;
            case MotionEventActions.Up:
                x2 = e.GetX();
                float deltaX = x2 - x1;
                if (Math.Abs(deltaX) > 5)
                {
                    // Left to Right swipe action
                    if (x2 > x1)
                    {
                        NextMonth(v);
                    }

                    // Right to left swipe action               
                    else
                    {
                        PreviousMonth(v);
                    }
                }
                break;
        }
        return true;           
    }

    public Boolean NextMonth(View v)
    {
        Toast.MakeText(myContext, "NextMonth called", ToastLength.Short).Show();      
        return true;
    }

    public Boolean PreviousMonth(View v)
    {
        Toast.MakeText(myContext, "PreviousMonth called", ToastLength.Short).Show();
        return true;
    }
}

定义了点击界面：

public interface MyItemClickListener
{
    void OnItemClick(View view, int postion);
}

在MainActivity中设置点击回调以更改背景颜色：

  public class MainActivity : Activity,MyItemClickListener
    { 
        RecyclerView mRecyclerView;
        RecyclerView.LayoutManager mLayoutManager;
        CustomAdapter mAdapter;
        string[] dataSet;
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            InitDataSet();
            SetContentView(Resource.Layout.Main);

            mLayoutManager = new LinearLayoutManager(this);

            mRecyclerView = FindViewById<RecyclerView>(Resource.Id.recyclerView);
            mRecyclerView.SetLayoutManager(mLayoutManager);
            mAdapter = new CustomAdapter(dataSet,this);
            mAdapter.setOnItemClickListener(this);
            mRecyclerView.SetAdapter(mAdapter);

            //mRecyclerView.SetOnTouchListener(this);
        }

        public void InitDataSet()
        {
            dataSet = new string[60];
            for (int i = 0; i < 60; i++)
            {
                dataSet[i] = "This is element #" + i;
            }
        }

        public void OnItemClick(View view, int postion)
        {
            mAdapter.NotifyItemChanged(CustomAdapter.selected_position);
            CustomAdapter.selected_position = postion;
            mAdapter.NotifyItemChanged(postion);
        }
     }
   }

注意：保持手指快速移动，如果速度足够慢，则不会调用MotionEventActions.Down。

Github souce code

屏幕截图：

Answer 2

在你的onClick中试试这个

    public void OnClick(View v)
        {
            int position = mRecyclerView.GetChildLayoutPosition((View)sender);
            int oldPosition = selectedPosition;
            selected_position = position;
            // Updating old as well as new positions
            NotifyItemChanged(oldPosition);

            NotifyItemChanged(selected_position);
        }

请注意，您必须在更新两个项目之前更改所选位置

RecyclerView fling和项目点击

2 个答案: