Nathan Walters Nathan Walters - 3 months ago 45
Android Question

Make navigation drawer draw behind status bar

I'm trying to create a Nav Drawer like the one from the Material spec (like the one from the new gmail app). Note how the contents of the nav drawer draw behind the status bar:

example from the Material spec

Using Chris Banes' answer from this question, I was able to successfully make the navigation drawer in my app draw behind the status bar; that's working fine. What isn't working is drawing the contents of the nav drawer behind the status bar. I want the blue image in my drawer to be displayed behind the status bar, but that area is drawn with the color of status bar, as seen in this screenshot.

my app

So, how can I make my navigation drawer draw in the area behind the status bar? I've posted the relevant parts of my project below.

Base layout containing the navigation drawer:

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/nav_drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:fitsSystemWindows="true">

<!-- Framelayout to display Fragments -->
<FrameLayout
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/warning_container" />

<FrameLayout
android:id="@+id/navigation_drawer_fragment_container"
android:layout_width="300dp"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:layout_gravity="start">

<fragment
android:id="@+id/navigation_drawer_fragment"
android:name="com.thebluealliance.androidclient.fragments.NavigationDrawerFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout="@layout/fragment_navigation_drawer" />

</FrameLayout>

</android.support.v4.widget.DrawerLayout>


Theme of my activity

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


In
onCreate()
of my activity, I do the following:

mDrawerLayout.setStatusBarBackground(R.color.primary_dark);

Answer

I found the best way to do this on Android 5.0. The key is to use a ScrimInsetFrameLayout as the root element of the navigation drawer (the second View in the DrawerLayout). This will make the content expand to fill the space behind the status bar. To color the inset properly, you can set the following attribute on the ScrimInsetFrameLayout:

app:insetForeground="#4000"

Also, make sure that you have android:fitsSystemWindows="true" on the scrim layout!

The source code for the ScrimInsetFrameLayout can be found here: https://github.com/google/iosched/blob/master/android/src/main/java/com/google/samples/apps/iosched/ui/widget/ScrimInsetsFrameLayout.java

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