Android - 框架布局高度与协调器布局不匹配 [英] Android - Frame layout height not matching with coordinator layout

问题描述

我的 FrameLayout(抽屉式布局中的容器)有问题.FrameLayout 的高度超过了屏幕高度(在底部 android 默认菜单按钮下方).

解决方案
我的第一次尝试是在 FrameLayout 中设置 android:layout_marginBottom="?attr/actionBarSize".这解决了在没有垂直可滚动内容的情况下具有固定"高度的不可滚动视图的解决方案(就像通常的具有 match_parent 高度的RelativeLayout).将组件与父底部对齐 (android:layout_alignParentBottom="true") 会导致元素仍然可见.在 Android Studio 的预览器中，高度不可见.
然而，这个 marginBotton 修复为根视图是可滚动的片段(如 RecyclerView)引入了一个新问题.对于这些视图，向下滚动时，底部边距将在白色条中可见(如果白色是背景色).这接缝合理，对于那些视图，嵌套滚动功能将滑出工具栏
tl;dr 我通过将 ?attr/actionBarSize 作为底部边距应用于 Framelayout 中显示的不可滚动片段来解决该问题.在此之前，我将工具栏的高度设置为 ?attr/actionBarSize.
活动布局:
 <android.support.v7.widget.Toolbarandroid:id="@+id/工具栏"android:layout_width="match_parent"android:layout_height="?attr/actionBarSize"app:layout_scrollFlags="scroll|enterAlways"/></android.support.design.widget.AppBarLayout><框架布局android:id="@+id/容器"android:layout_width="match_parent"android:layout_height="match_parent"app:layout_behavior="@string/appbar_scrolling_view_behavior"/></android.support.design.widget.CoordinatorLayout>
片段布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_marginBottom="?attr/actionBarSize"机器人:方向=垂直"><!-- 这里还有更多的东西--><TextView android:id="@+id/label"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentBottom="true"/></LinearLayout>
我现在面临的唯一缺点是在创建片段布局时 Android Studio 的预览器中会显示空白.
I have a problem with my FrameLayout (Container in Drawer Layout). The height of the FrameLayout exceeds the screen height (below the android default menu buttons at bottom).
<android.support.design.widget.CoordinatorLayout
        android:id="@+id/main_content"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

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

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

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

        <FrameLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    </android.support.design.widget.CoordinatorLayout>
解决方案
My first attempt was to set a android:layout_marginBottom="?attr/actionBarSize" at the FrameLayout. This solved the solution for non-scrollable views having a "fixed" height in terms of no vertically scrollable content (like a usual RelativeLayout with match_parent height). Aligning a component to the parent bottom (android:layout_alignParentBottom="true") results in a still visible element. In Android Studio's Previewer the no exceeding of the height is visible.

However, this marginBotton-fix introduces a new problem for fragments whose root view is scrollable (like a RecyclerView). For these views when scrolling down the bottom margin will become visible in a white bar (in case white is the background color). This seams reasonable, as for those views the nested scrolling feature will slide out the toolbar


tl;dr I worked around that issue by applying the the ?attr/actionBarSize as bottom margin to non-scrollable fragments that are shown inside the Framelayout. Prior to that I set the height of the toolbar to be ?attr/actionBarSize.

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

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

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

        <FrameLayout
                android:id="@+id/container"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />

</android.support.design.widget.CoordinatorLayout>
Fragment layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:layout_marginBottom="?attr/actionBarSize"
          android:orientation="vertical">
          <!-- Further stuff here -->
          <TextView android:id="@+id/label"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_alignParentBottom="true"
          />
  </LinearLayout>
The only downside I faced right now is the white space to be shown in Android Studio's Previewer while creating the fragment layout.

                        
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