Question

plz帮助获取错误View无法转换为MotionEvent，MotionEvent无法转换为View ..

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.OnItemTouchListener;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;



   public class RecyclerTouchListener implements OnItemTouchListener {
    private ClickListener clickListener;
    private GestureDetector gestureDetector;

    public interface ClickListener {
        void onClick(View view, int i);

        void onLongClick(View view, int i);
    }

    public void onRequestDisallowInterceptTouchEvent(boolean z) {
    }

    public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
    }

    public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
        this.clickListener = clickListener;
        this.gestureDetector = new GestureDetector(context, new SimpleOnGestureListener() {
            public boolean onSingleTapUp(MotionEvent motionEvent) {
                return true;
            }

            public void onLongPress(MotionEvent motionEvent) {
                motionEvent = recyclerView.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
                if (motionEvent != null && clickListener != null) {
                    clickListener.onLongClick(motionEvent, recyclerView.getChildPosition(motionEvent));
                }
            }
        });
    }

    public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
        View findChildViewUnder = recyclerView.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
        if (!(findChildViewUnder == null || this.clickListener == null || this.gestureDetector.onTouchEvent(motionEvent) == null)) {
            this.clickListener.onClick(findChildViewUnder, recyclerView.getChildPosition(findChildViewUnder));
        }
        return null;
    }
}

单个文件中的错误列表

1种无与伦比的类型：布尔值和<null>

2个不兼容的类型：无法转换为布尔值

3种不兼容的类型：视图无法转换为MotionEvent

4种不兼容的类型：MotionEvent无法转换为View

不知道如何解决这个问题。

预先感谢您的帮助

我希望很清楚，如果有错误，对不起

Answer 1

在#1 Wrong. Inner join can produce anywhere between 0 and 1000 rows. #2 Wrong. Left join can produce anywhere between 10 and 1000 rows. #3 Wrong. Right join can produce anywhere between 100 and 1000 rows. #4 Wrong. Full outer join can produce anywhere between 100 and 1000 rows. #5 Wrong. Full outer join can produce anywhere between 100 and 1000 rows. #6 Wrong. Joins can produce anywhere between 0 and 1000 rows. #7 Correct. Joins can produce anywhere between 0 and 1000 rows.

findChildViewUnder方法返回一个View。 MotionEvent is a type of InputEvent not a View

motionEvent = recyclerView.findChildViewUnder是无效的比较，因为布尔基元永远不能为null，如果触摸被拦截，则只能为true。

类似地，this.gestureDetector.onTouchEvent(motionEvent) == null不能onInterceptTouchEvent

您应该使用return null而不是使用GestureDetector并从侦听器中手动调用setOnClickListener

View无法转换为MotionEvent，MotionEvent无法转换为View

1 个答案: