与 AppBarLayout 重叠滚动视图 [英] Overlap scrolling view with AppBarLayout

问题描述

我想从 来做到这一点?

解决方案

事实上，用 AppBarLayout 覆盖滚动视图是 Android 设计支持库:您可以在 NestedScrollView 上使用 app:behavior_overlapTop 属性(或任何使用 ScrollingViewBehavior) 设置重叠量:

请注意，app:behavior_overlapTop 仅适用于具有 app:layout_behavior="@string/appbar_scrolling_view_behavior" 的视图，因为它是使用属性 (不是视图或父视图组，因为属性通常适用于)，因此是 behavior_ 前缀.

或者通过以编程方式设置它setOverlayTop():

NestedScrollView scrollView = ...CoordinatorLayout.LayoutParams 参数 =(CoordinatorLayout.LayoutParams) scrollView.getLayoutParams();AppBarLayout.ScrollingViewBehavior 行为 =(AppBarLayout.ScrollingViewBehavior) params.getBehavior();行为.setOverlayTop(128);//注意:以像素为单位

I want to implement the 'Flexible Space with overlapping content' pattern from the Material design scrolling techniques, such as in this video:

My XML layout right now looks like:

<android.support.design.widget.CoordinatorLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent">

  <android.support.design.widget.AppBarLayout
      android:layout_width="match_parent"
      android:layout_height="192dp"
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <android.support.design.widget.CollapsingToolbarLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

      <android.support.v7.widget.Toolbar
          android:layout_height="?attr/actionBarSize"
          android:layout_width="match_parent"
          app:layout_collapseMode="pin"/>
    </android.support.design.widget.CollapsingToolbarLayout>
  </android.support.design.widget.AppBarLayout>

  <android.support.v4.widget.NestedScrollView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
      <....>
    </LinearLayout>
  </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

Is there an easy way to accomplish this using the Design Library? Or do I have to build a custom CoordinatorLayout.Behavior to do this?

解决方案

In fact, overlaying the scrolling view with the AppBarLayout is an included feature of the Android Design Support Library: you can use the app:behavior_overlapTop attribute on your NestedScrollView (or any View using ScrollingViewBehavior) to set the overlap amount:

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    app:behavior_overlapTop="64dp">

Note that app:behavior_overlapTop only works on views that have the app:layout_behavior="@string/appbar_scrolling_view_behavior" as it is the Behavior that is using the attribute (not the View or the Parent ViewGroup, as attributes usually apply to), hence the behavior_ prefix.

Or set it programmatically via setOverlayTop():

NestedScrollView scrollView = ...
CoordinatorLayout.LayoutParams params = 
    (CoordinatorLayout.LayoutParams) scrollView.getLayoutParams();
AppBarLayout.ScrollingViewBehavior behavior =
    (AppBarLayout.ScrollingViewBehavior) params.getBehavior();
behavior.setOverlayTop(128); // Note: in pixels

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