Return from unity activity to MainActivity in android studio

Question

I have made an app in android studio and a game in Unity. Now I want to combint these two together. Starting is no problem in android calling the unityNativePlayer. But when I want to go back from the unity activity to the MainActivity.java it comes to this: I have an exit button in the unity game calling Application.exit(); and nothing happens when I press the button. Is there a mistake?

Answer 1

Application.exit() does not exist in Unity API.

For the Editor, use UnityEditor.EditorApplication.isPlaying = false;

Use Application.Quit() for your builds.

It is better to use Editor pre-processor to do this or you will have problem building your code that contains UnityEditor.EditorApplication.isPlaying = false; line of code for other platforms.

The code below should solved that problem:

#if UNITY_EDITOR
     UnityEditor.EditorApplication.isPlaying = false;
#else
        Application.Quit();
#endif

Please understand that you should not have have any exit UI Button for mobile devices. It will work but it is a bad design. This is what the physical Home(iOS) or back(Android) buttons are used for.

EDIT:

You just want to quit Unity Activity from Java. The function should do it.

public void quitUnityActivity ()
{
    UnityPlayer.currentActivity.runOnUiThread(new Runnable(){
        public void run()
        {
            Log.v("Unity", "Unity Activity Exited!" );
            this.mUnityPlayer.quit();
            UnityPlayer.currentActivity.finish();
        }
    });
}

If that doesn't work, try

public void quitUnityActivity()
{
    Log.v("Unity", "Unity Activity Exited!");
    this.mUnityPlayer.quit();
    UnityPlayer.currentActivity.finish();
}

To call the Java function from Unity using C#.

void exitUnity()
{
    AndroidJavaClass myClass = new AndroidJavaClass("com.companyName.productName.MyClass");
    myClass.Call("quitUnityActivity");
}

Make sure to replace com.companyName.productName.MyClass with whatever you named your class in your Android Studio.