Android status bar scrolling up with coordinator layout, leaving status icons overlapping toolbar title

问题

I am experiencing an issue when using Coordinator Layout that contains an AppBarLayout (holding a ToolBar and a TabLayout) and a ViewPager (holding fragments) as children. I want the topbar to be hidden when scrolling down, and revealed when scrolling back up. However when I scroll down, the status bar scrolls up as well, leaving the top bar just below the status icons, being overlapped by them.

I tried adding android:fitsSystemWindows="true" to both the AppBarLayout and the ViewPager but nothing changed.

Below the code used and snapshots showing the two states:

<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:fitsSystemWindows="true">

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

        <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|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

        <android.support.design.widget.TabLayout
            android:id="@+id/sliding_tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMaxWidth="0dp"
            app:tabGravity="fill"
            app:tabMode="fixed"/>

    </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>

回答1:

Review the theme for the activity, if the theme is like @style/AppTheme.NoActionBar or one theme without ActionBar, try putting a color, you must have a style(v21) something like this:

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    <item name="android:statusBarColor">@android:color/transparent</item>    
</style>

change it for :

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    <item name="android:statusBarColor">@color/colorPrimaryDark</item>
</style>

来源：https://stackoverflow.com/questions/33989984/android-status-bar-scrolling-up-with-coordinator-layout-leaving-status-icons-ov