Make sure we quit qt when the service is destroyed

Task-number: QTBUG-58471
Change-Id: I37f162717f57323136811a8f80d53e3c3b7d6f22
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

src/android/jar/src/org/qtproject/qt5/android/QtNative.java

@@ -348,6 +348,7 @@ public class QtNative
     // application methods
     public static native void startQtApplication(String params, String env);
     public static native boolean startQtAndroidPlugin();
+    public static native void quitQtCoreApplication();
     public static native void quitQtAndroidPlugin();
     public static native void terminateQt();
     // application methods

src/android/jar/src/org/qtproject/qt5/android/QtServiceDelegate.java

@@ -185,6 +185,6 @@ public class QtServiceDelegate
 
     public void onDestroy()
     {
-        QtNative.setService(null, null);
+        QtNative.quitQtCoreApplication();
     }
 }

src/plugins/platforms/android/androidjnimain.cpp

@@ -533,6 +533,12 @@ static jboolean startQtApplication(JNIEnv *env, jobject /*object*/, jstring para
     return pthread_create(&m_qtAppThread, nullptr, startMainMethod, nullptr) == 0;
 }
 
+static void quitQtCoreApplication(JNIEnv *env, jclass /*clazz*/)
+{
+    Q_UNUSED(env);
+    QCoreApplication::quit();
+}
+
 static void quitQtAndroidPlugin(JNIEnv *env, jclass /*clazz*/)
 {
     Q_UNUSED(env);
@@ -733,6 +739,7 @@ static JNINativeMethod methods[] = {
     {"startQtAndroidPlugin", "()Z", (void *)startQtAndroidPlugin},
     {"startQtApplication", "(Ljava/lang/String;Ljava/lang/String;)V", (void *)startQtApplication},
     {"quitQtAndroidPlugin", "()V", (void *)quitQtAndroidPlugin},
+    {"quitQtCoreApplication", "()V", (void *)quitQtCoreApplication},
     {"terminateQt", "()V", (void *)terminateQt},
     {"setDisplayMetrics", "(IIIIDDDD)V", (void *)setDisplayMetrics},
     {"setSurface", "(ILjava/lang/Object;II)V", (void *)setSurface},