为什么我的插页式广告在错误的时间（但在正确的位置）展示？

Question

I'd like to show an interstitial ad while going from MainActivity to Activity2. Instead, the ad only shows when clicking back from Activity2 to the MainActivity.

Does anyone know what I've done wrong?

Thanks

I have a button in MainActivity that loads Activity2. I have the following in the code for the button.

 if (mInterstitialAd != null) {
            mInterstitialAd.show(MainActivity.this);
        } else {
            Log.i(TAG, "Ad failed to load");

    }

I thought I could solve the problem by replacing MainActivity.this with Activity2, but it get a red underline. I've tried "Activity2," "Activity2.class" and "Activity2.java."

The below code is for loading and calling the ads.

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });
        loadInterstitial();



    public void loadInterstitial(){
        AdRequest adRequest = new AdRequest.Builder().build();
        InterstitialAd.load(this, getString(R.string.interstitial_ad_unit_id), adRequest, new             InterstitialAdLoadCallback() {

            @Override
            public void onAdLoaded(@NonNull InterstitialAd interstitialAd) {
                super.onAdLoaded(interstitialAd);
                Log.d(TAG, "Ad loaded successfully");
                mInterstitialAd = interstitialAd;
                mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback() {
                    @Override
                    public void onAdFailedToShowFullScreenContent(@NonNull AdError adError) {
                        super.onAdFailedToShowFullScreenContent(adError);
                        Log.d(TAG, "Ad failed to show");

                    }

                    @Override
                    public void onAdShowedFullScreenContent() {
                        super.onAdShowedFullScreenContent();
                        Log.d(TAG, "Ad shown successfully");
                        mInterstitialAd = null;

                    }


                    @Override
                    public void onAdDismissedFullScreenContent() {
                        super.onAdDismissedFullScreenContent();
                        Log.d(TAG, "Ad dismissed");
                    }
                });
            }

            @Override
            public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
                super.onAdFailedToLoad(loadAdError);
                Log.i(TAG, "onAdLoaded");
                mInterstitialAd = null;
            }
        });

        }

Answer 1

I think you need to add changes like below way.

In MainActivity to write below code

Add constant

public static final int REQUEST_CODE = 1;

Call Activity2 like below way

Intent intent = new Intent(MainActivity.this,
                Activity2.class);
        startActivityForResult(intent , REQUEST_CODE);

Now use onActivityResult to retrieve the result

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        try {
            super.onActivityResult(requestCode, resultCode, data);

            if (requestCode == REQUEST_CODE  && resultCode  == RESULT_OK) {

               loadInterstitial();
            }
        } catch (Exception ex) {
            Toast.makeText(Activity.this, ex.toString(),
                    Toast.LENGTH_SHORT).show();
        }

    }

And Activity2 to write below code whenever you are press back key/button action

Intent intent = getIntent();
intent.putExtra("key", value);
setResult(RESULT_OK, intent);
finish();