RecyclerView不是真正在ScrollView上wrap_content [英] RecyclerView is not trully wrap_content at the ScrollView

问题描述

我有一个ScrollView,，其中包含一个垂直的LinearLayout..在这里，我添加了一些称为"Section"的视图. "Section"是一个LinearLayout,，其中包含一个TextView和`RecyclerView.

I have a ScrollView, which contains a vertical LinearLayout. This is a place, where I add some amount of Views called "Section". "Section" is a LinearLayout, which contains a TextView and `RecyclerView.

<ScrollView
    android:id="@+id/main_scrollview"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/sections_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" />
</ScrollView>

部分:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:textSize="@dimen/activity_starred_title_textsize" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

问题是RecyclerView有时不是真正的wrap_content.因此，它会产生2种类型的问题(取决于我尝试使用的解决方案类型).

The problem is that RecyclerView is not truly wrap_content sometimes. Therefore it creates 2 types of problems (depending on solution type I'm trying to use).

1. 它可能无法滚动(因此它与屏幕高度匹配，因此我无法向下滚动以查看其中的其他项).

1. It can be unscrollable (so it matches screen height and I can't scroll it down to see rest of items inside).

它可以滚动嵌套.

最初的问题是它具有嵌套滚动.所以我希望RecyclerViews成为简单的垂直LinearLayouts，唯一具有滚动效果的是根ScrollView.

Originally problem is that it has nested scrolling. So I want RecyclerViews to be as simple vertical LinearLayouts and the only thing that has to have scrolling effect is root ScrollView.

我试图做什么?

1. 扩展GridLayoutManager并覆盖canScrollVertically().方法:

布尔布尔值canScrollVertically(){ 返回false； }

public boolean canScrollVertically(){ return false; }

扩展RecyclerView类并覆盖

@Override 公共布尔onInterceptTouchEvent(MotionEvent事件){ 返回false； }

@Override public boolean onInterceptTouchEvent(MotionEvent event){ return false; }

@Override 公共布尔onTouchEvent(MotionEvent事件){ 返回false； }

@Override public boolean onTouchEvent(MotionEvent event){ return false; }

在可能的任何地方通过xml禁用NestedScrolling.

Disable NestedScrolling via xml everywhere, where it is possible.

使用以下解决方案覆盖GridLayoutManager:解决方案

Override GridLayoutManager using this solution: SOLUTION

推荐答案

请勿在ScrollView内使用RecyclerView或ListView.对于嵌套滚动，应使用NestedScrollView.

Don't use RecyclerView or ListView inside ScrollView. For nested scrolling you should use NestedScrollView.

NestedScrollView就像ScrollView一样，但是它支持充当 在新版本和旧版本上均使用nested滚动父级和子级 Android.默认情况下，嵌套滚动处于启用状态.

NestedScrollView is just like ScrollView, but it supports acting as both a nested scrolling parent and child on both new and old versions of Android. Nested scrolling is enabled by default.

解决方案:

1..不是使用ScrollView，而是将NestedScrollView用作Section零件(RecyclerView和其他Views)的容器.

1. Instead of using ScrollView, use NestedScrollView as container of your Section part(RecyclerView and other Views).

<android.support.v4.widget.NestedScrollView
    android:id="@+id/main_scrollview"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/sections_layout"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <!-- Your Section:: RecyclerView and other Views -->

    </LinearLayout>
</android.support.v4.widget.NestedScrollView>

2..对于滚动问题，请在您的RecyclerView上使用setNestedScrollingEnabled(false).

2. For scrolling issue use setNestedScrollingEnabled(false) to your RecyclerView.

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