public class StartActivity extends AppCompatActivity {

private InterstitialAd mInterstitialAd;
private AdRequest adRequest;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_start);

    MobileAds.initialize(this,
            "ca-app-pub-5564929454578772~9142258701");

    mInterstitialAd = new InterstitialAd(this);
    mInterstitialAd.setAdUnitId("ca-app-pub-5564929454578772/2221627130");
    mInterstitialAd.loadAd(new AdRequest.Builder().build());

switch (view.getId()) {

 case R.id.all:
            quizCategory = 4;

            if (mInterstitialAd.isLoaded()) {
                mInterstitialAd.show();
            } else {
                Log.d("TAG", "Peníze nechtějí do mé kapsy");
            }

            Intent intent4 = new Intent(getApplicationContext(), AllActivity.class);
            intent4.putExtra("QUIZ_CATEGORY", quizCategory);

            startActivity(intent4);

            break;
}




}



}