Hiding the status and navigation bars immediately in app launch

Question

I was wondering if there is a way to hide an Android device's soft keys (status and navigation bars) right when an app launches? Take, for instance, a game that initially displays a black screen while hiding the soft keys in runtime prior to the brand, title, and main menu screen.

I included the following code snippet in my MainActivity, and when the app launches, I initially see a white screen with the soft keys in runtime for about a second and then the softkeys later disappear when MainActivity's thread finishes running:

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if (hasFocus) {
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }
}

Thanks a bunch.

* UPDATE AS OF 1/19/2017: * After including:

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

... into the app's theme, only the status bar hides on time as opposed to the navigation bar. My second post - Hiding the navigation bar immediately on app launch

Answer 1

have a look into your styles.xml and add the item android:windowFullscreen.

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowFullscreen">true</item>
</style>

I hope that helps.

Ben