fix(splashscreen): nav & title bar showing in fullscreen mode (#733)

Co-authored-by: Daniel Stone <daniel.stone@powerdms.com>
Co-authored-by: distinctdan <distinctdan@users.noreply.github.com>

framework/src/org/apache/cordova/CordovaActivity.java

@@ -125,6 +125,9 @@ public void onCreate(Bundle savedInstanceState) {
             // (as was the case in previous cordova versions)
             if (!preferences.getBoolean("FullscreenNotImmersive", false)) {
                 immersiveMode = true;
+                // The splashscreen plugin needs the flags set before we're focused to prevent
+                // the nav and title bars from flashing in.
+                setImmersiveUiVisibility();
             } else {
                 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                         WindowManager.LayoutParams.FLAG_FULLSCREEN);
@@ -321,22 +324,26 @@ public void onDestroy() {
     /**
      * Called when view focus is changed
      */
-    @SuppressLint("InlinedApi")
     @Override
     public void onWindowFocusChanged(boolean hasFocus) {
         super.onWindowFocusChanged(hasFocus);
         if (hasFocus && immersiveMode) {
-            final int uiOptions = 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;
-
-            getWindow().getDecorView().setSystemUiVisibility(uiOptions);
+            setImmersiveUiVisibility();
         }
     }
 
+    @SuppressLint("InlinedApi")
+    protected void setImmersiveUiVisibility() {
+        final int uiOptions = 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;
+
+        getWindow().getDecorView().setSystemUiVisibility(uiOptions);
+    }
+
     @SuppressLint("NewApi")
     @Override
     public void startActivityForResult(Intent intent, int requestCode, Bundle options) {