是否可以在iPhoneX上同时运行ARWorldTracking Session和ARFaceTracking Session？(Is it possible to run ARWorldTracking Session and ARFaceTracking Session at the same time on iPhoneX?)

 在执行finish（）的同一个语句中，也可以在此执行动画。 然后，在新的活动中，运行另一个动画。 请看这段代码： 
 
 fadein.xml 
 
<set xmlns:android="http://schemas.android.com/apk/res/android" 
     android:fillAfter="true">
     <alpha android:fromAlpha="1.0" 
            android:toAlpha="0.0"
            android:duration="500"/> //Time in milliseconds
</set>
 
 在你的班级 
 
private void finishTask() {
    if(blabbla==blablabla){
        finish();
        runFadeAnimation();
    }
}

private void runFadeInAnimation() {
    Animation a = AnimationUtils.loadAnimation(this, R.anim.fadein);
    a.reset();
    LinearLayout ll = (LinearLayout) findViewById(R.id.yourviewhere);
    ll.clearAnimation();
    ll.startAnimation(a);   
}
 
 fadeout.xml 
 
<set xmlns:android="http://schemas.android.com/apk/res/android"
           android:fillAfter="true">
  <alpha android:fromAlpha="0.0"
         android:toAlpha="1.0"
         android:duration="500"/>
</set>
 
 在新的Activity类中，您创建一个类似于我写的runFadeAnimation的类似方法，然后在onCreate中运行它，不要忘记将资源ID更改为fadeout。 

In the same statement in which you execute finish(), execute your animation there too. Then, in the new activity, run another animation. See this code:
 
fadein.xml
 
<set xmlns:android="http://schemas.android.com/apk/res/android" 
     android:fillAfter="true">
     <alpha android:fromAlpha="1.0" 
            android:toAlpha="0.0"
            android:duration="500"/> //Time in milliseconds
</set>
 
In your finish-class
 
private void finishTask() {
    if("blabbla".equals("blablabla"){
        finish();
        runFadeInAnimation();
    }
}

private void runFadeInAnimation() {
    Animation a = AnimationUtils.loadAnimation(this, R.anim.fadein);
    a.reset();
    LinearLayout ll = (LinearLayout) findViewById(R.id.yourviewhere);
    ll.clearAnimation();
    ll.startAnimation(a);   
}
 
fadeout.xml
 
<set xmlns:android="http://schemas.android.com/apk/res/android"
           android:fillAfter="true">
  <alpha android:fromAlpha="0.0"
         android:toAlpha="1.0"
         android:duration="500"/>
</set>
 
In your new Activity-class you create a similiar method like the runFadeAnimation I wrote and then you run it in onCreate and don't forget to change the resources id to fadeout.