如何调用多个插屏广告？

Question

我向我的应用程序添加了插页式广告（+横幅），其中包含一项活动，横幅没有问题，但插页式广告仅在应用程序启动时显示一次，我的应用程序不包含任何按钮或操作，只是一个 pdfview，这是我想要的do 是当用户阅读 pdf 时每 5 分钟展示一次广告。我搜索了类似的问题但找不到。这是我加载并显示广告的代码：

    AdView mAdView = (AdView) findViewById(R.id.adView);
    AdRequest adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);

    // Prepare the Interstitial Ad
    interstitial = new InterstitialAd(PDFViewActivity.this);
    // Insert the Ad Unit ID
    interstitial.setAdUnitId("ca-app-pub-3940256099942544/1033173712");
    interstitial.loadAd(adRequest);
    // Prepare an Interstitial Ad Listener
    interstitial.setAdListener(new AdListener() {
        public void onAdLoaded() {
            // Call displayInterstitial() function
            displayInterstitial();
        }
    });
}

public void displayInterstitial() {
// If Ads are loaded, show Interstitial else show nothing.
    if (interstitial.isLoaded()) {
        interstitial.show();
    }
}

Answer 1

我是这样做的：

AdView mAdView = (AdView) findViewById(R.id.adView);
    AdRequest adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);

    // Prepare the Interstitial Ad
    interstitial = new InterstitialAd(this);
    interstitial.setAdUnitId("ca-app-pub-3940256099942544/1033173712");

    interstitial.loadAd(adRequest);

    interstitial.setAdListener(new AdListener() {
        public void onAdLoaded() {
            displayInterstitial();
        }
        public void onAdClosed() {
            requestNewInterstitial();
        }

    });
}

public void displayInterstitial() {
// If Ads are loaded, show Interstitial else show nothing.
    if (interstitial.isLoaded()) {
        interstitial.show();
    }
}

public void requestNewInterstitial() {
    mHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            AdRequest adRequest = new AdRequest.Builder()
                    .build();
            interstitial.loadAd(adRequest);

            if (mHandler != null) {
                mHandler.postDelayed(this, 100000); //time (ms)
            }
        }
    }, 100000); //time (ms)
}