+ // Remove the translucent status bar overlay.
+ getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+ // Remove the translucent status bar overlay on the `Drawer Layout`, which is special and needs its own command.
+ drawerLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+
+ /* SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
+ * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
+ * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
+ */
+ rootCoordinatorLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+ } else { // Hide everything except the status and navigation bars.
+ // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
+ rootCoordinatorLayout.setSystemUiVisibility(0);
+
+ // Add the translucent status flag if it is unset.
+ getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+ if (translucentNavigationBarOnFullscreen) {
+ // Set the navigation bar to be translucent. This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
+ getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+ } else {
+ // Set the navigation bar to be black.
+ getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+ }
+ }
+ } else { // Switch to normal viewing mode.
+ // Show the `appBar` if `findOnPageLinearLayout` is not visible.
+ if (findOnPageLinearLayout.getVisibility() == View.GONE) {
+ appBar.show();
+ }
+
+ // Show the `BannerAd` in the free flavor.
+ if (BuildConfig.FLAVOR.contentEquals("free")) {
+ // Initialize the ad. The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
+ AdHelper.initializeAds(findViewById(R.id.adview), getApplicationContext(), getFragmentManager(), getString(R.string.ad_id));
+ }
+
+ // Remove any `SYSTEM_UI` flags from `rootCoordinatorLayout`.
+ rootCoordinatorLayout.setSystemUiVisibility(0);
+
+ // Remove the translucent navigation bar flag if it is set.
+ getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
+
+ // Add the translucent status flag if it is unset. This also resets `drawerLayout's` `View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN`.
+ getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
+
+ // Constrain `rootCoordinatorLayout` inside the status and navigation bars.
+ rootCoordinatorLayout.setFitsSystemWindows(true);
+ }