自定义 View 实现了 onTouchEvent，导致 Click 不起作用如何处理

Question

我现在有个 ListView 现在要实现滑动删除功能，添加了自定义View之后，导致ListView 点击无效。

下面是从网上找的 SwipeLayout 的实现：

package com.zcshou.gogogo;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;

import androidx.annotation.NonNull;
import androidx.core.view.ViewCompat;
import androidx.customview.widget.ViewDragHelper;

/**
 * Created by Bruce on 11/24/14.
 */
public class SwipeLayout extends LinearLayout {

    private final ViewDragHelper viewDragHelper;
    private View contentView;
    private View actionView;
    private int dragDistance;
    private int draggedX;

    public SwipeLayout(Context context) {
        this(context, null);
    }

    public SwipeLayout(Context context, AttributeSet attrs) {
        this(context, attrs, -1);
    }

    public SwipeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        viewDragHelper = ViewDragHelper.create(this, new DragHelperCallback());
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        contentView = getChildAt(0);
        actionView = getChildAt(1);
        actionView.setVisibility(GONE);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        dragDistance = actionView.getMeasuredWidth();
    }

    private class DragHelperCallback extends ViewDragHelper.Callback {

        @Override
        public boolean tryCaptureView(@NonNull View view, int i) {
            return view == contentView || view == actionView;
        }

        @Override
        public void onViewPositionChanged(@NonNull View changedView, int left, int top, int dx, int dy) {
            draggedX = left;
            if (changedView == contentView) {
                actionView.offsetLeftAndRight(dx);
            } else {
                contentView.offsetLeftAndRight(dx);
            }
            if (actionView.getVisibility() == View.GONE) {
                actionView.setVisibility(View.VISIBLE);
            }
            invalidate();
        }

        @Override
        public int clampViewPositionHorizontal(@NonNull View child, int left, int dx) {
            if (child == contentView) {
                final int leftBound = getPaddingLeft();
                final int minLeftBound = -leftBound - dragDistance;
                return Math.min(Math.max(minLeftBound, left), 0);
            } else {
                final int minLeftBound = getPaddingLeft() + contentView.getMeasuredWidth() - dragDistance;
                final int maxLeftBound = getPaddingLeft() + contentView.getMeasuredWidth() + getPaddingRight();
                return Math.min(Math.max(left, minLeftBound), maxLeftBound);
            }
        }

        @Override
        public int getViewHorizontalDragRange(@NonNull View child) {
            return dragDistance;
        }

        @Override
        public void onViewReleased(@NonNull View releasedChild, float xvel, float yvel) {
            super.onViewReleased(releasedChild, xvel, yvel);
            boolean settleToOpen;
            double AUTO_OPEN_SPEED_LIMIT = 800.0;
            if (xvel > AUTO_OPEN_SPEED_LIMIT) {
                settleToOpen = false;
            } else if (xvel < -AUTO_OPEN_SPEED_LIMIT) {
                settleToOpen = true;
            } else if (draggedX <= -dragDistance / 2) {
                settleToOpen = true;
            } else if (draggedX > -dragDistance / 2) {
                settleToOpen = false;
            } else {
                settleToOpen = false;
            }

            final int settleDestX = settleToOpen ? -dragDistance : 0;
            viewDragHelper.smoothSlideViewTo(contentView, settleDestX, 0);
            ViewCompat.postInvalidateOnAnimation(SwipeLayout.this);
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if(viewDragHelper.shouldInterceptTouchEvent(ev)) {
            return true;
        }
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        if (event.getAction() == MotionEvent.ACTION_UP) {
            performClick();
        }
        viewDragHelper.processTouchEvent(event);
        return true;
    }

    @Override
    public boolean performClick() {
        // Calls the super implementation, which generates an AccessibilityEvent
        // and calls the onClick() listener on the view, if any
        super.performClick();

        // Handle the action for the custom click here

        return true;
    }

    @Override
    public void computeScroll() {
        super.computeScroll();
        if(viewDragHelper.continueSettling(true)) {
            ViewCompat.postInvalidateOnAnimation(this);
        }
    }
}

Answer 1

在onTouch()事件中，如果返回true，就不会执行onClick()，返回false，就同时执行onClick()方法。

在MotionEvent.ACTION_UP事件里调用一下performClick()方法试试吧~