How do I get the interfacial ad between an Activity and another?

Question

I think I did everything correctly, but the application jumps to the next Activity without appearing anything.

public class...

  private FirebaseAnalytics mFirebaseAnalytics;
  private AdView adView01;
  private AdRequest adRequest01;
  private InterstitialAd adInter01;

  onCreate()...

    MobileAds.initialize(this, "ca-app-pub-6843243039127549/2394454715");
    adView01=(AdView)findViewById(R.id.adView03);
    adRequest01=new AdRequest.Builder().build();
    adView01.loadAd(adRequest01);
    adInter01=new InterstitialAd(this);
    adInter01.setAdUnitId("ca-app-pub-6843243039127549/3871187910");
    adInter01.loadAd(adRequest01);

    mFirebaseAnalytics=FirebaseAnalytics.getInstance(this);

  onClick()...

    case R.id.btnCompras:

      adInter01.show();
      Intent it01 = new Intent(this, MainActivity02.class);
      startActivity(it01);
      break;

I think it may be some problem to be using the same Adrequest that I use for the banner, but the banner keeps working. (in this and the other Activity as well)

The application does not accuse any error, so it gets harder to detect which cause does not work

Site where I picked up information to place interticial ad => https://developers.google.com/admob/android/interstitial

EDIT 01 ----------------------------------

I did what I was told, see the code below:

case R.id.btnCompras:

  adInter01.setAdListener(new AdListener(){
    @Override
    public void onAdClosed(){
      Intent it01 = new Intent(this, MainActivity02.class);
      startActivity(it01);
    }
  });
  break;

But the attempt to implement the code, presented an error (we could not transcribe, so the image):

Answer 1

I believe you should call the new Activity when the ad is closed, using Adlistener

mInterstitialAd.setAdListener(new AdListener() {
        @Override
        public void onAdLeftApplication() {
            // Code to be executed when the user has left the app.

        }

        @Override
        public void onAdClosed() {
            // Code to be executed when when the interstitial ad is closed.
            //aqui tu chama a nova activity
    });