Android: Allow modifying the status/navigation bar colours

ComponentPeer::setAppStyle() will now update the status and navigation
bar foreground colours, with some caveats:

- Status and nav bar backgrounds are now always completely transparent.
- The navigation bar foreground colour can only be changed on Android
  API 26 or higher.
- For platforms using gesture controls instead of button controls, the
  system automatically determines the colour of the gesture bar. On
  those systems, setAppStyle() will only affect the status bar colour.

modules/juce_gui_basics/native/java/app/com/rmsl/juce/ComponentPeerView.java

@@ -34,6 +34,9 @@
 
 package com.rmsl.juce;
 
+import static android.view.WindowInsetsController.APPEARANCE_LIGHT_CAPTION_BARS;
+import static android.view.WindowInsetsController.APPEARANCE_LIGHT_NAVIGATION_BARS;
+import static android.view.WindowInsetsController.APPEARANCE_LIGHT_STATUS_BARS;
 import static android.view.WindowInsetsController.BEHAVIOR_DEFAULT;
 import static android.view.WindowInsetsController.BEHAVIOR_SHOW_BARS_BY_SWIPE;
 import static android.view.WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE;
@@ -804,7 +807,7 @@ public final class ComponentPeerView extends ViewGroup
     {
     }
 
-    public void setSystemUiVisibilityCompat (Window window, boolean visible)
+    public void setSystemUiVisibilityCompat (Window window, boolean visible, boolean isLight)
     {
         if (30 <= Build.VERSION.SDK_INT)
         {
@@ -812,6 +815,11 @@ public final class ComponentPeerView extends ViewGroup
 
             if (controller != null)
             {
+                final int mask = (35 <= Build.VERSION.SDK_INT ? APPEARANCE_LIGHT_CAPTION_BARS : 0)
+                               | APPEARANCE_LIGHT_NAVIGATION_BARS
+                               | APPEARANCE_LIGHT_STATUS_BARS;
+                controller.setSystemBarsAppearance (isLight ? mask : 0, mask);
+
                 if (visible)
                 {
                     controller.show (WindowInsets.Type.systemBars());
@@ -843,14 +851,18 @@ public final class ComponentPeerView extends ViewGroup
 
         for (View view : views)
         {
+            final int lightStyle = (26 <= Build.VERSION.SDK_INT ? SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR : 0)
+                                 | SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
             final int prevFlags = view.getSystemUiVisibility();
             final int fullScreenFlags = SYSTEM_UI_FLAG_HIDE_NAVIGATION
                                       | SYSTEM_UI_FLAG_FULLSCREEN
                                       | SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
-            final int newFlags = visible ? (prevFlags & ~fullScreenFlags)
-                                         : (prevFlags |  fullScreenFlags);
+            final int withVisibility = visible ? (prevFlags & ~fullScreenFlags)
+                                               : (prevFlags |  fullScreenFlags);
+            final int withColour = isLight ? (withVisibility |  lightStyle)
+                                           : (withVisibility & ~lightStyle);
 
-            view.setSystemUiVisibility (newFlags);
+            view.setSystemUiVisibility (withColour);
         }
     }
 

modules/juce_gui_basics/native/javaopt/app/com/rmsl/juce/JuceActivity.java

@@ -60,13 +60,21 @@ public class JuceActivity   extends Activity
                     ? (  SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)
-                    : SYSTEM_UI_FLAG_LAYOUT_STABLE;
+                    : 0;
 
             decorView.setSystemUiVisibility (decorView.getSystemUiVisibility() | flags);
         }
 
         if (30 <= Build.VERSION.SDK_INT)
             getWindow().setDecorFitsSystemWindows (false);
+
+        if (29 <= Build.VERSION.SDK_INT)
+        {
+            if (Build.VERSION.SDK_INT < 35)
+                getWindow().setStatusBarContrastEnforced (false);
+
+            getWindow().setNavigationBarContrastEnforced (false);
+        }
     }
 
     @Override