Android: request POST_NOTIFICATIONS permission for Android Notifier

Android 13 and above requires the notification permission
"android.permission.POST_NOTIFICATIONS" to be requested at runtime.

Pick-to: 6.7 6.6 6.5
Fixes: QTBUG-121668
Change-Id: I38512ffc07c1a3ffe7cddffa937b98332f172d15
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>

examples/corelib/platform/androidnotifier/CMakeLists.txt

@@ -28,6 +28,7 @@ qt_add_executable(androidnotifier
 )
 
 target_link_libraries(androidnotifier PRIVATE
+    Qt6::CorePrivate
     Qt6::Widgets
 )
 

examples/corelib/platform/androidnotifier/android/AndroidManifest.xml

@@ -6,6 +6,7 @@
     android:versionName="1.0">
 
     <!-- %%INSERT_PERMISSIONS -->
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <!-- %%INSERT_FEATURES -->
 
     <supports-screens

examples/corelib/platform/androidnotifier/notificationclient.cpp

@@ -5,10 +5,22 @@
 
 #include <QtCore/qjniobject.h>
 #include <QtCore/qcoreapplication.h>
+#include <QtCore/private/qandroidextras_p.h>
+
+using namespace Qt::StringLiterals;
 
 NotificationClient::NotificationClient(QObject *parent)
     : QObject(parent)
 {
+    if (QNativeInterface::QAndroidApplication::sdkVersion() >= __ANDROID_API_T__) {
+        const auto notificationPermission = "android.permission.POST_NOTIFICATIONS"_L1;
+        auto requestResult = QtAndroidPrivate::requestPermission(notificationPermission);
+        if (requestResult.result() != QtAndroidPrivate::Authorized) {
+            qWarning() << "Failed to acquire permission to post notifications "
+                          "(required for Android 13+)";
+        }
+    }
+
     connect(this, &NotificationClient::notificationChanged,
             this, &NotificationClient::updateAndroidNotification);
 }