Android: Differentiate between standalone Qt app and embedded view

Add a helper method to tell whether the app is a standalone Qt for
Android app, where also the Context is created by Qt, or whether Qt
content is embedded as a View into a Context created by the user, i.e.
a "native" Android app.

Pick-to: 6.7
Change-Id: I618ba1c8cb40c9b132fc12a7ee6d54c071efa983
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

2 files changed, 28 insertions, 0 deletions

diff --git a/src/plugins/platforms/android/androidjnimain.cpp b/src/plugins/platforms/android/androidjnimain.cpp
index 9a9a0ac777..7beae1993d 100644
--- a/src/plugins/platforms/android/androidjnimain.cpp
+++ b/src/plugins/platforms/android/androidjnimain.cpp
@@ -50,6 +50,9 @@ static AAssetManager *m_assetManager = nullptr;
 static jobject m_assets = nullptr;
 static jobject m_resourcesObj = nullptr;
 
+static jclass m_qtActivityClass = nullptr;
+static jclass m_qtServiceClass = nullptr;
+
 static QtJniTypes::QtActivityDelegate m_activityDelegate = nullptr;
 static QtJniTypes::QtInputDelegate m_inputDelegate = nullptr;
 
@@ -203,6 +206,20 @@ namespace QtAndroid
         return m_inputDelegate;
     }
 
+    bool isQtApplication()
+    {
+        // Returns true if the app is a Qt app, i.e. Qt controls the whole app and
+        // the Activity/Service is created by Qt. Returns false if instead Qt is
+        // embedded into a native Android app, where the Activity/Service is created
+        // by the user, outside of Qt, and Qt content is added as a view.
+        JNIEnv *env = QJniEnvironment::getJniEnv();
+        static const jint isQtActivity = env->IsInstanceOf(QtAndroidPrivate::activity().object(),
+                                                           m_qtActivityClass);
+        static const jint isQtService = env->IsInstanceOf(QtAndroidPrivate::service().object(),
+                                                          m_qtServiceClass);
+        return isQtActivity || isQtService;
+    }
+
     void notifyAccessibilityLocationChange(uint accessibilityObjectId)
     {
         qtActivityDelegate().callMethod<void>("notifyLocationChange", accessibilityObjectId);
@@ -500,6 +517,10 @@ static void terminateQt(JNIEnv *env, jclass /*clazz*/)
         env->DeleteGlobalRef(m_bitmapDrawableClass);
     if (m_assets)
         env->DeleteGlobalRef(m_assets);
+    if (m_qtActivityClass)
+        env->DeleteGlobalRef(m_qtActivityClass);
+    if (m_qtServiceClass)
+        env->DeleteGlobalRef(m_qtServiceClass);
     m_androidPlatformIntegration = nullptr;
     delete m_androidAssetsFileEngineHandler;
     m_androidAssetsFileEngineHandler = nullptr;
@@ -817,6 +838,11 @@ static bool registerNatives(QJniEnvironment &env)
                          m_bitmapDrawableClass,
                          "<init>", "(Landroid/content/res/Resources;Landroid/graphics/Bitmap;)V");
 
+    FIND_AND_CHECK_CLASS("org/qtproject/qt/android/QtActivityBase");
+    m_qtActivityClass = static_cast<jclass>(env->NewGlobalRef(clazz));
+    FIND_AND_CHECK_CLASS("org/qtproject/qt/android/QtServiceBase");
+    m_qtServiceClass = static_cast<jclass>(env->NewGlobalRef(clazz));
+
     return true;
 }
 
diff --git a/src/plugins/platforms/android/androidjnimain.h b/src/plugins/platforms/android/androidjnimain.h
index 2affde4961..2d9ac730f5 100644
--- a/src/plugins/platforms/android/androidjnimain.h
+++ b/src/plugins/platforms/android/androidjnimain.h
@@ -76,6 +76,8 @@ namespace QtAndroid
 
     QString deviceName();
     bool blockEventLoopsWhenSuspended();
+
+    bool isQtApplication();
 }
 
 QT_END_NAMESPACE