Android布局:具有滚动行为的Viewpager内的垂直Recyclerview内的水平Recyclerview

问题描述 投票:57回答:6

这是我正在尝试使用以下所有元素构建的应用程序:

Veggies app

但是,一切正常,我希望内部水平回收视图不捕获任何垂直滚动。所有垂直滚动必须朝向外部垂直回收视图,而不是水平回滚视图,因此垂直滚动将允许工具栏根据其scrollFlag退出视图。

当我将手指放在recyclerview的“StrawBerry Plant”部分并向上滚动时,它会滚出工具栏:

strawberry plant

如果我将手指放在水平滚动视图上并向上滚动,它根本不会滚出工具栏。

以下是我目前为止的xml布局代码。

Activity xml布局:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/fragment_container"
    android:clipChildren="false">

    <android.support.design.widget.CoordinatorLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/container"
        >

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|enterAlways">

        </android.support.v7.widget.Toolbar>

        <android.support.design.widget.TabLayout
            android:id="@+id/sliding_tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            style="@style/CustomTabLayout"
            />

    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />

    </android.support.design.widget.CoordinatorLayout>

</FrameLayout>

“Fruits”片段xml布局(这是片段的代码 - 片段在上图中标出):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/progressBar"
        android:visibility="gone"
        android:layout_centerInParent="true"
        android:indeterminate="true"/>

<!--    <android.support.v7.widget.RecyclerView-->
    <com.example.simon.customshapes.VerticallyScrollRecyclerView
        android:id="@+id/main_recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

</RelativeLayout>

我使用了一个名为VerticallyScrollRecyclerView的自定义类,该类跟随google在视图组中处理触摸事件的示例。它的目的是拦截和使用所有垂直滚动事件,以便它可以滚动进出工具栏:http://developer.android.com/training/gestures/viewgroup.html

VerticallyScrollRecyclerView的代码如下:

public class VerticallyScrollRecyclerView extends RecyclerView {

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

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

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

    ViewConfiguration vc = ViewConfiguration.get(this.getContext());
    private int mTouchSlop = vc.getScaledTouchSlop();
    private boolean mIsScrolling;
    private float startY;

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        final int action = MotionEventCompat.getActionMasked(ev);
        // Always handle the case of the touch gesture being complete.
        if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
            // Release the scroll.
            mIsScrolling = false;
            startY = ev.getY();
            return super.onInterceptTouchEvent(ev); // Do not intercept touch event, let the child handle it
        }
        switch (action) {
            case MotionEvent.ACTION_MOVE: {
                Log.e("VRecView", "its moving");
                if (mIsScrolling) {
                    // We're currently scrolling, so yes, intercept the
                    // touch event!
                    return true;
                }
                // If the user has dragged her finger horizontally more than
                // the touch slop, start the scroll
                // left as an exercise for the reader
                final float yDiff = calculateDistanceY(ev.getY());
                Log.e("yDiff ", ""+yDiff);
                // Touch slop should be calculated using ViewConfiguration
                // constants.
                if (Math.abs(yDiff) > 5) {
                    // Start scrolling!
                    Log.e("Scroll", "we are scrolling vertically");
                    mIsScrolling = true;
                    return true;
                }
                break;
            }
        }
        return super.onInterceptTouchEvent(ev);
    }


    private float calculateDistanceY(float endY) {
        return startY - endY;
    }

}

“收藏夹”布局是垂直回收者视图中的回收者视图:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="@color/white"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Favourite"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="16dp"
        android:id="@+id/header_fav"/>

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_below="@+id/header_fav"
        android:id="@+id/recyclerview_fav">
    </android.support.v7.widget.RecyclerView>

</RelativeLayout>

这一直困扰着我一段时间,我还没有设法找到解决方案。有谁知道如何解决这个问题?

5分给Gryffindor正确的答案,当然还有SO的声望点。

android android-layout android-recyclerview android-coordinatorlayout android-appbarlayout
6个回答
100
投票

测试解决方案:

所有你需要的是在内部mInnerRecycler.setNestedScrollingEnabled(false);s上调用RecyclerView

说明:

RecyclerView通过实现API 21接口支持NestedScrollingChild中引入的嵌套滚动。当您在另一个滚动视图中滚动视图并且只想在聚焦时滚动内部View时,这是一个很有价值的功能。

在任何情况下,RecyclerView默认情况下在初始化时调用RecyclerView.setNestedScrollingEnabled(true);。现在,回到问题,因为你的两个RecyclerViews都在ViewPager相同的AppBarBehavior内,CoordinateLayout必须决定当你从内部RecyclerView滚动时响应哪个卷轴;当你的内部RecyclerView的嵌套滚动被启用时,它获得滚动焦点,CoordinateLayout将选择响应其滚动外部RecyclerView的滚动。问题是,因为你的内部RecyclerViews不垂直滚动,所以没有垂直滚动变化(从CoordinateLayout的角度来看),如果没有变化,AppBarLayout也不会改变。

在你的情况下,因为你的内部RecyclerViews在不同的方向滚动,你可以禁用它,从而导致CoordinateLayout忽略其滚动并响应外部RecyclerView的滚动。

注意:

xml属性android:nestedScrollingEnabled="boolean"不适合与RecyclerView一起使用,并且尝试使用android:nestedScrollingEnabled="false"将导致java.lang.NullPointerException,因此,至少就目前而言,您必须在代码中执行此操作。


2
投票

经过测试的解决方案,使用自定义NestedScrollView()

码:

public class CustomNestedScrollView extends NestedScrollView {
    public CustomNestedScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
         // Explicitly call computeScroll() to make the Scroller compute itself
            computeScroll();
        }
        return super.onInterceptTouchEvent(ev);
    }
}

2
投票

我有点迟了但这对于面临同样问题的其他人肯定会有用

 mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
            @Override
            public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
                int action = e.getAction();
               // Toast.makeText(getActivity(),"HERE",Toast.LENGTH_SHORT).show();
                switch (action) {
                    case MotionEvent.ACTION_POINTER_UP:
                        rv.getParent().requestDisallowInterceptTouchEvent(true);

                        break;
                }
                return false;
            }

1
投票

尝试

public OuterRecyclerViewAdapter(List<Item> items) {
    //Constructor stuff
    viewPool = new RecyclerView.RecycledViewPool();
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    //Create viewHolder etc
    holder.innerRecyclerView.setRecycledViewPool(viewPool);

}

内部recylerview将使用相同的viewpool,它会更顺畅


0
投票

我建议你在像谷歌应用程序这样的片段中添加水平回收视图


0
投票

如果还有人在看,试试这个:

private val Y_BUFFER = 10
private var preX = 0f
private var preY = 0f

mView.rv.addOnItemTouchListener(object : RecyclerView.OnItemTouchListener {
        override fun onTouchEvent(p0: RecyclerView, p1: MotionEvent) {

            }

        override fun onInterceptTouchEvent(rv: RecyclerView, e: MotionEvent): Boolean {
                when (e.action) {
                    MotionEvent.ACTION_DOWN -> rv.parent.requestDisallowInterceptTouchEvent(true)
                    MotionEvent.ACTION_MOVE -> {
                        if (Math.abs(e.x - preX) > Math.abs(e.y - preY)) {
                            rv.parent.requestDisallowInterceptTouchEvent(true)
                        } else if (Math.abs(e.y - preY) > Y_BUFFER) {
                            rv.parent.requestDisallowInterceptTouchEvent(false)
                        }

                    }
                }
                preX = e.x
                preY = e.y
                return false
            }

            override fun onRequestDisallowInterceptTouchEvent(p0: Boolean) {
            }
        })

它会检查当前是否水平滚动,然后不允许父项为handel事件

© www.soinside.com 2019 - 2024. All rights reserved.