Android: Light/dark modes detection

After commit: 2248487c6ca9d5459c70a16868d5aeee07d96157 light/dark mode
detection is supported by Windows and macOS. This commit add similar
implementation on the Android side.

Task-number: QTBUG-83185
Change-Id: Id1ece98e91a31759b58d651ef62b3715ea25d85f
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>
(cherry picked from commit 76abdaafb540be90e87c6689cc64040e95147777)

src/android/jar/src/org/qtproject/qt/android/QtActivityDelegate.java

@@ -849,6 +849,8 @@ public class QtActivityDelegate
         QtNative.handleOrientationChanged(rotation, m_nativeOrientation);
         m_currentRotation = rotation;
 
+        handleUiModeChange(m_activity.getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK);
+
         float refreshRate = (Build.VERSION.SDK_INT < Build.VERSION_CODES.R)
                 ? m_activity.getWindowManager().getDefaultDisplay().getRefreshRate()
                 : m_activity.getDisplay().getRefreshRate();
@@ -969,6 +971,18 @@ public class QtActivityDelegate
             updateFullScreen();
     }
 
+    private void handleUiModeChange(int uiMode)
+    {
+        switch (uiMode) {
+            case Configuration.UI_MODE_NIGHT_NO:
+                QtNative.handleUiDarkModeChanged(0);
+                break;
+            case Configuration.UI_MODE_NIGHT_YES:
+                QtNative.handleUiDarkModeChanged(1);
+                break;
+        }
+    }
+
     public void onConfigurationChanged(Configuration configuration)
     {
         try {
@@ -976,6 +990,7 @@ public class QtActivityDelegate
         } catch (Exception e) {
             e.printStackTrace();
         }
+        handleUiModeChange(configuration.uiMode & Configuration.UI_MODE_NIGHT_MASK);
     }
 
     public void onDestroy()

src/android/jar/src/org/qtproject/qt/android/QtNative.java

@@ -1404,6 +1404,7 @@ public class QtNative
     public static native void handleOrientationChanged(int newRotation, int nativeOrientation);
     public static native void handleRefreshRateChanged(float refreshRate);
     // screen methods
+    public static native void handleUiDarkModeChanged(int newUiMode);
 
     // pointer methods
     public static native void mouseDown(int winId, int x, int y);

src/plugins/platforms/android/androidjnimain.cpp

@@ -755,6 +755,12 @@ static void handleRefreshRateChanged(JNIEnv */*env*/, jclass /*cls*/, jfloat ref
         m_androidPlatformIntegration->setRefreshRate(refreshRate);
 }
 
+static void handleUiDarkModeChanged(JNIEnv */*env*/, jobject /*thiz*/, jint newUiMode)
+{
+    QAndroidPlatformIntegration::setAppearance(
+        (newUiMode == 1 ) ? QPlatformTheme::Appearance::Dark : QPlatformTheme::Appearance::Light);
+}
+
 static void onActivityResult(JNIEnv */*env*/, jclass /*cls*/,
                              jint requestCode,
                              jint resultCode,
@@ -784,6 +790,7 @@ static JNINativeMethod methods[] = {
     { "setSurface", "(ILjava/lang/Object;II)V", (void *)setSurface },
     { "updateWindow", "()V", (void *)updateWindow },
     { "updateApplicationState", "(I)V", (void *)updateApplicationState },
+    { "handleUiDarkModeChanged", "(I)V", (void *)handleUiDarkModeChanged },
     { "handleOrientationChanged", "(II)V", (void *)handleOrientationChanged },
     { "onActivityResult", "(IILandroid/content/Intent;)V", (void *)onActivityResult },
     { "onNewIntent", "(Landroid/content/Intent;)V", (void *)onNewIntent },

src/plugins/platforms/android/qandroidplatformintegration.cpp

@@ -488,6 +488,15 @@ void QAndroidPlatformIntegration::setScreenSize(int width, int height)
         QMetaObject::invokeMethod(m_primaryScreen, "setSize", Qt::AutoConnection, Q_ARG(QSize, QSize(width, height)));
 }
 
+QPlatformTheme::Appearance QAndroidPlatformIntegration::m_appearance = QPlatformTheme::Appearance::Light;
+
+void QAndroidPlatformIntegration::setAppearance(QPlatformTheme::Appearance newAppearance)
+{
+    if (m_appearance == newAppearance)
+        return;
+    m_appearance = newAppearance;
+}
+
 void QAndroidPlatformIntegration::setScreenSizeParameters(const QSize &physicalSize,
                                                           const QSize &screenSize,
                                                           const QRect &availableGeometry)

src/plugins/platforms/android/qandroidplatformintegration.h

@@ -13,6 +13,7 @@
 #include <qpa/qplatformnativeinterface.h>
 #include <qpa/qplatformopenglcontext.h>
 #include <qpa/qplatformoffscreensurface.h>
+#include <qpa/qplatformtheme.h>
 
 #include <EGL/egl.h>
 #include <memory>
@@ -103,6 +104,8 @@ public:
 
     void flushPendingUpdates();
 
+    static void setAppearance(QPlatformTheme::Appearance newAppearance);
+    static QPlatformTheme::Appearance appearance() { return m_appearance; }
 #if QT_CONFIG(vulkan)
     QPlatformVulkanInstance *createPlatformVulkanInstance(QVulkanInstance *instance) const override;
 #endif
@@ -115,6 +118,8 @@ private:
 
     QThread *m_mainThread;
 
+    static QPlatformTheme::Appearance m_appearance;
+
     static QRect m_defaultAvailableGeometry;
     static QSize m_defaultPhysicalSize;
     static QSize m_defaultScreenSize;

src/plugins/platforms/android/qandroidplatformtheme.cpp

@@ -358,6 +358,11 @@ void QAndroidPlatformTheme::showPlatformMenuBar()
     QtAndroidMenu::openOptionsMenu();
 }
 
+QPlatformTheme::Appearance QAndroidPlatformTheme::appearance() const
+{
+    return QAndroidPlatformIntegration::appearance();
+}
+
 static inline int paletteType(QPlatformTheme::Palette type)
 {
     switch (type) {

src/plugins/platforms/android/qandroidplatformtheme.h

@@ -35,6 +35,7 @@ public:
     QPlatformMenu *createPlatformMenu() const override;
     QPlatformMenuItem *createPlatformMenuItem() const override;
     void showPlatformMenuBar() override;
+    Appearance appearance() const override;
     const QPalette *palette(Palette type = SystemPalette) const override;
     const QFont *font(Font type = SystemFont) const override;
     QVariant themeHint(ThemeHint hint) const override;