Android BottomSheet: Is hiding under the toolbar

问题

I tried to use the new bottom sheet from the support library 23.2.0 to have a bottom sheet expand to full screen like suggested in the design guidelines

This works very good but the bottom sheet goes under my ActionBar and under my tabs.

How is it possible to let the bottom sheet go over the toolbar? My menu is structured like this:

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/appbar_padding_top">

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

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

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

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

    <include
        android:id="@+id/playerLayout"
        layout="@layout/player_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:behavior_peekHeight="?attr/actionBarSize"
        app:layout_behavior="@string/bottom_sheet_behavior"
        app:model="@{model}"/>

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

回答1:

The AppBarLayout has a default elevation of 4dp (the dimension resource value design_appbar_elevation).

By default CoordinatorLayout, like any FrameLayout, will layout elements with higher elevation before lower elevation on API 21 and higher devices.

Try adding android:elevation="@dimen/design_appbar_elevation" to your layout.

Note that the elevation of a modal bottom sheet is @dimen/design_bottom_sheet_modal_elevation == 16dp

回答2:

If the above answer doesn't help, try to set to your BottomSheet:

android:elevation="@dimen/design_appbar_elevation" android:fitsSystemWindows="true"

and create your Fragment such way:

videoFragment = VideoFragment.newInstance(); getSupportFragmentManager().beginTransaction() .replace(R.id.video_fragment, videoFragment) .commit();
not like this: videoFragment = (VideoFragment) getSupportFragmentManager().findFragmentById(R.id.video_fragment);

For example I have such layout:

<android.support.design.widget.CoordinatorLayout
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:background="@color/activity_background">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.ActionBar">

    <include layout="@layout/toolbar"/>

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

<android.support.v7.widget.RecyclerView
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

<android.support.design.widget.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    app:itemBackground="@color/white"
    app:menu="@menu/bottom_navigation_main"/>

<FrameLayout
    android:id="@+id/video_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:elevation="@dimen/design_appbar_elevation"
    android:fitsSystemWindows="true"
    app:behavior_hideable="true"
    app:behavior_peekHeight="0dp"
    app:layout_behavior="android.support.design.widget.BottomSheetBehavior"/>

and it doesn't work without specified things

来源：https://stackoverflow.com/questions/35711808/android-bottomsheet-is-hiding-under-the-toolbar