Showing content behind status and navigation bar

Question

This looks like a duplicate question but I am not able to do it. I want complete transparent(not translucent) status bar as well as navigation bar and want the content to appear behind them.

activity_details.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary"
    tools:context="com.bitspilanidvm.bosm2017.DetailsActivity">

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/q"
    android:scaleType="centerCrop"/>

</LinearLayout>

v21 styles.xml

<resources>

<!-- Theme for API level > 21 -->
<style name="AppTheme" parent="AppBaseTheme">
     <!--Customize your theme here. -->
    <item name="android:statusBarColor">@android:color/transparent</item>
    <item name="android:navigationBarColor">@android:color/transparent</item>
</style>

In the activity java file

getWindow().getDecorView().setSystemUiVisibility(
        View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
               View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        );

This is what I get.

How to get content behind the navigation bar?

If I add

<item name="android:windowTranslucentNavigation">true</item>

to my styles.xml

Here is what I get

As you can see, the content goes behind navigation bar but the navigation bar has to be translucent for this.

Is there any solution for this?

Answer 1

Add the FLAG_LAYOUT_NO_LIMITS flag within the Window. This will work for Android KitKat and above APIs. Example of this would be something like this:

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        Window window = getWindow(); 
     window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
    }

The reason why the FLAG_FULLSCREEN doesn't work is simply because the FULLSCREEN flag is for removing screen decors like status bar(which works for you). However Navigation bar is not a screen decor. The LAYOUT_NO_LIMIT flag allows the window to extend beyond the screen limit, hence Navigation bar also gets covered within this flag.

Also you could simply hide the navigation and status bar by setting the app in immersive mode.

EDIT The API ViewCompat.setOnApplyWindowInsetListener solves issues which the android:fitsSystemWindows=”true” does not and window insets can be applied to a particular view. An example of this.

ViewCompat.setOnApplyWindowInsetsListener(toolbar, (v, insets) -> {
    ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) v.getLayoutParams();
    params.topMargin = insets.getSystemWindowInsetTop();
    return insets.consumeSystemWindowInsets();
});

Standard layouts like FrameLayout , LinearLayout or RelativeLayout will not pass window insets to their children, whereas material layouts will do (e.g. DrawerLayout , CoordinatorLayout ). So we can change our layout to any material one, or we can subclass a standard layout and pass the insets to the children of layout ourselves. We just have to override onApplyWindowInsets method.

@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
public WindowInsets onApplyWindowInsets(WindowInsets insets) {
    int childCount = getChildCount();
    for (int index = 0; index < childCount; ++index)
        getChildAt(index).dispatchApplyWindowInsets(insets); 
        // let children know about WindowInsets

    return insets;
}

Reference Documentation:OnApplyWindowInsetsListener, WindowInsets