ффф

immersion.java

@Override
public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        // логика
}

private void toggleFullscreen(final boolean fullscreen) {
        getSupportActionBar().hide();
        if (fullscreen) {
            if (Build.VERSION.SDK_INT >= 19) {
                this.getWindow().getDecorView()
                        .setSystemUiVisibility(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);
            } else {
                getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                        WindowManager.LayoutParams.FLAG_FULLSCREEN);
            }

        } else {
            if (Build.VERSION.SDK_INT >= 19) {
                this.getWindow().getDecorView()
                        .setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
                getWindow().setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION
                                | WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
                        WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION
                                | WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            } else {
                getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            }
        }
    }

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