带下拉刷新的RecyclerView嵌套横向RecyclerView事件冲突

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实际效果图

采用结构

• PtrFrameLayout 嵌套一个带下拉刷新的RecyclerView
  PtrFrameLayout是一个自定义下拉刷新布局

• RV内部Item包含一个横向滑动的RecyclerView在顶部

导致的问题：横向滑动RecyclerView时经常容易引起下拉刷新，这种体验很差

---

解决思路

1. 继承RecyclerView，重写dispatchTouchEvent，根据ACTION_MOVE的方向判断是否调用getParent().requestDisallowInterceptTouchEvent去阻止父view拦截点击事件

2. 通过继承PtrFrameLayout，重写requestDisallowInterceptTouchEvent方法，获取disallowIntercept来判断是否分发事件给父View（避免父View获取事件引起下拉操作）

    @Override
    public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
        disallowInterceptTouchEvent = disallowIntercept;
        //子View告诉父容器不要拦截我们的事件的
        super.requestDisallowInterceptTouchEvent(disallowIntercept);
    }```

#### 具体源码
* 重写横向滑动RecyclerView

public class BetterRecyclerView extends RecyclerView {
private ViewGroup parent;

public BetterRecyclerView(Context context) {
    super(context);
}

public BetterRecyclerView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public void setNestParent(ViewGroup parent) {
    this.parent = parent;
}

private int lastX = -1;
private int lastY = -1;

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    int x = (int) ev.getRawX();
    int y = (int) ev.getRawY();
    int dealtX = 0;
    int dealtY = 0;

    switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            dealtX = 0;
            dealtY = 0;
            // 保证子View能够接收到Action_move事件
            getParent().requestDisallowInterceptTouchEvent(true);
            break;
        case MotionEvent.ACTION_MOVE:
            dealtX += Math.abs(x - lastX);
            dealtY += Math.abs(y - lastY);

// Log.i("dispatchTouchEvent", "dealtX:=" + dealtX);
// Log.i("dispatchTouchEvent", "dealtY:=" + dealtY);
// 这里是够拦截的判断依据是左右滑动，读者可根据自己的逻辑进行是否拦截
if (dealtX >= dealtY) {
getParent().requestDisallowInterceptTouchEvent(true);
} else {
getParent().requestDisallowInterceptTouchEvent(false);
}
lastX = x;
lastY = y;
break;
case MotionEvent.ACTION_CANCEL:
break;
case MotionEvent.ACTION_UP:
break;

    }
    return super.dispatchTouchEvent(ev);
}

* 重写PtrFrameLayout的部分源码

private boolean disallowInterceptTouchEvent = false;
@Override
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
disallowInterceptTouchEvent = disallowIntercept;

    super.requestDisallowInterceptTouchEvent(disallowIntercept);
}

@Override
public boolean dispatchTouchEvent(MotionEvent e) {
    switch (e.getAction()) {
        case MotionEvent.ACTION_UP:
            this.requestDisallowInterceptTouchEvent(false);
            disableWhenHorizontalMove(true);
            break;
    }
    if (disallowInterceptTouchEvent) {
        return dispatchTouchEventSupper(e);
    }
    return super.dispatchTouchEvent(e);
}

作者：天才小迷弟
链接：https://www.jianshu.com/p/3868f0cbffe1
來源：简书
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