Android: do quit the app when calling JUCEApplicationBase::quit(), rather than just placing it in the background (same as on iOS).

modules/juce_events/native/juce_android_Messaging.cpp

@@ -156,7 +156,19 @@ void MessageManager::stopDispatchLoop()
 
         void messageCallback() override
         {
-            android.activity.callVoidMethod (JuceAppActivity.finish);
+            auto* env = getEnv();
+
+            jmethodID quitMethod = env->GetMethodID (JuceAppActivity, "finishAndRemoveTask", "()V");
+
+            if (quitMethod != 0)
+            {
+                env->CallVoidMethod (android.activity, quitMethod);
+                return;
+            }
+
+            quitMethod = env->GetMethodID (JuceAppActivity, "finish", "()V");
+            jassert (quitMethod != 0);
+            env->CallVoidMethod (android.activity, quitMethod);
         }
     };
 

modules/juce_gui_basics/native/juce_android_Windowing.cpp

@@ -100,6 +100,10 @@ JUCE_JNI_CALLBACK (JUCE_ANDROID_ACTIVITY_CLASSNAME, quitApp, void, (JNIEnv* env,
     JUCEApplicationBase::appWillTerminateByForce();
 
     android.shutdown (env);
+
+    jclass systemClass = (jclass) env->FindClass ("java/lang/System");
+    jmethodID exitMethod = env->GetStaticMethodID (systemClass, "exit", "(I)V");
+    env->CallStaticVoidMethod (systemClass, exitMethod, 0);
 }
 
 JUCE_JNI_CALLBACK (JUCE_ANDROID_ACTIVITY_CLASSNAME, appActivityResult, void, (JNIEnv* env, jobject, jint requestCode, jint resultCode, jobject intentData))