问题

我在 ViewPager 内的 NestedScrollView 内有一个水平的 RecyclerView。现在，当我尝试滚动 RecyclerView 时，有时它会滚动，但有时只有 ViewPager 会滚动。

代码

这就是我的 RecyclerView XML 的样子:

<android.support.v7.widget.RecyclerView
            android:id="@+id/sidescroll"
            android:layout_below="@+id/movie_more_movies2"
            android:layout_marginTop="@dimen/material_layout_keylines_horizontal_margin"
            android:layout_marginBottom="@dimen/material_layout_keylines_horizontal_margin"
            android:layout_width="match_parent"
            android:orientation="horizontal"
            app:layoutManager="android.support.v7.widget.LinearLayoutManager"
            android:layout_height="wrap_content"/>

这就是 RecyclerView 所在的 Nested Scroll 的样子:

<android.support.v4.widget.NestedScrollView
    android:id="@+id/detail_holder"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipToPadding="false"
    android:descendantFocusability="blocksDescendants"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    >

这是 viewpager xml:

<com.mt.moviesiwanttowatch.ui.ViewPagerWithHorizontalRecyclerView
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clipChildren="false"
            android:clipToPadding="false"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

我正在使用这个自定义 ViewPager:

public class ViewPagerWithHorizontalRecyclerView extends ViewPager {

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

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

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
        if(v instanceof RecyclerView){
            Log.e("PAGER", "IS");
            return false;
        } else {
            Log.e("PAGER", "IS NOT " + v.toString());
        }

        return super.canScroll(v, checkV, dx, x, y);
    }
}

我的方法

如您所见，我到目前为止所做的尝试是编写一个自定义 ViewPager。我试图告诉 ViewPager 如果滚动来自 RecyclerView，它就不能滚动。但是，这不起作用。

日志:

这是当 ViewPager 而不是 RecyclerView 滚动时的日志

>     06-27 17:50:53.506 32362-32362/com.mt.moviesiwanttowatch E/PAGER: IS NOT
> com.mt.moviesiwanttowatch.ui.ViewPagerWithHorizontalRecyclerView{c506165
> VFED..... ........ 0,341-1080,1794 #7f090287 app:id/viewpager}
>     06-27 17:50:53.506 32362-32362/com.mt.moviesiwanttowatch E/PAGER: IS NOT android.support.v4.widget.NestedScrollView{d21952 VFED.....
> ........ 0,0-1080,1453 #7f0900b9 app:id/detail_holder}
>     06-27 17:50:53.506 32362-32362/com.mt.moviesiwanttowatch E/PAGER: IS NOT android.widget.RelativeLayout{6ddeec0 V.E...... ........
> 0,0-1080,2860 #7f090199 app:id/movie_overview_holder}
>     06-27 17:50:53.506 32362-32362/com.mt.moviesiwanttowatch E/PAGER: IS

最佳答案

尝试为recycleView设置onTouchListener:

recycleView.setOnTouchListener(new OnTouchListener() {
        private float mLastX = 0, mLastY = 0;

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_MOVE:
                    float deltaX = event.getX() - mLastX;
                    float deltaY = event.getY() - mLastY;
                    if (Math.abs(deltaX) > 20 && Math.abs(deltaX) > Math.abs(deltaY)) {
                        getParent().requestDisallowInterceptTouchEvent(true);
                    }
                    mLastX = event.getX();
                    mLastY = event.getY();
                    break;
                case MotionEvent.ACTION_CANCEL:
                case MotionEvent.ACTION_UP:
                    getParent().requestDisallowInterceptTouchEvent(false);
                    break;
            }
            return onTouchEvent(event);
        }
    });

关于java - ViewPager 内的水平回收器 View 不滚动，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44784779/