Android PtrFrameLayout 与RecyclerView滑动冲突解决方法

1.背景

如果你也是用的PtrFrameLayout 下拉刷新框架和RecyclerView 出现了冲突，可以参考一下。

在开发中，一个水平布局的RecyclerView出现了与PtrFrameLayout的滑动冲突，造成RecyclerView滑动卡顿。解决滑动冲突有内部拦截和外部拦截方法，这里采用内部拦截方法()。直接看代码。
分别继承 PtrFrameLayout与RecyclerView。

2.主要代码逻辑

2.1 父View代码（PtrFrameLayout）

父View对事件不进行处理，交由子类（RecyclerView）来处理
1.重写requestDisallowInterceptTouchEvent方法，这个方法是通知父类是否拦截时间

@Override
    public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
        disallowInterceptTouchEvent = disallowIntercept;
        super.requestDisallowInterceptTouchEvent(disallowIntercept);
    }

2.重写dispatchTouchEvent方法

 @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);
    }

对事件不进行拦截

2.2 子View关键代码（RecyclerView）

重写dispatchTouchEvent（）方法

@Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        int x = (int) ev.getX();
        int y = (int) ev.getY();
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                getParent().requestDisallowInterceptTouchEvent(true);
                break;
            case MotionEvent.ACTION_MOVE:
                final int deltaX = x - lastXIntercepted;
                final int deltaY = y - lastYIntercepted;
                if (Math.abs(deltaX) > Math.abs(deltaY)) {
                    getParent().requestDisallowInterceptTouchEvent(true);//通知父View不拦截
                } else {
                    getParent().requestDisallowInterceptTouchEvent(false);
                }
                break;
            case MotionEvent.ACTION_UP:
                break;
        }
        lastXIntercepted = x;
        lastYIntercepted = y;
        return super.dispatchTouchEvent(ev);
    }

主要是根据判断条件来通知父View是否拦截事件，这里是判断横向滑动与纵向滑动距离，然后通知父类是否拦截，具体情况具体分析。

3.完整代码

3.1 父View完整代码

/**
 * 解决水平滑动与PtrFrameLayout滑动冲突问题
 */
public class FixScrollerPtrFrameLayout extends PtrFrameLayout {
    private PtrEHeader mPtrEHeader;
    private RecyclerView recyclerView;

    public FixScrollerPtrFrameLayout(Context context) {
        super(context);
        initView();
    }

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

    public FixScrollerPtrFrameLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initView();
    }

    private void initView() {
        PtrClassicDefaultHeader header=new PtrClassicDefaultHeader(getContext());
        recyclerView = new RecyclerView(getContext());
        mPtrEHeader = new PtrEHeader(getContext());//下拉刷新头部
        addPtrUIHandler(mPtrEHeader);
        setHeaderView(mPtrEHeader);

    }

    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);
    }
}

3.2 子View完整代码

/**
 * 解决水平滑动与PtrFrameLayout滑动冲突问题
 */
public class FixScrollerRecyclerView extends RecyclerView {

    private int lastXIntercepted, lastYIntercepted;

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

    public FixScrollerRecyclerView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public FixScrollerRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        int x = (int) ev.getX();
        int y = (int) ev.getY();
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                getParent().requestDisallowInterceptTouchEvent(true);
                break;
            case MotionEvent.ACTION_MOVE:
                final int deltaX = x - lastXIntercepted;
                final int deltaY = y - lastYIntercepted;
                if (Math.abs(deltaX) > Math.abs(deltaY)) {
                    getParent().requestDisallowInterceptTouchEvent(true);
                } else {
                    getParent().requestDisallowInterceptTouchEvent(false);
                }
                break;
            case MotionEvent.ACTION_UP:
                break;
        }
        lastXIntercepted = x;
        lastYIntercepted = y;
        return super.dispatchTouchEvent(ev);
    }
}

最后只需要在在相应的位置引用这两个布局就OK。