在Recycler View中成功实施Native Advanced Ads之后，应用在少数情况下仍然崩溃

如何解决在Recycler View中成功实施Native Advanced Ads之后，应用在少数情况下仍然崩溃

在Native Advanced中成功实施RecyclerView广告之后，应用仍然在少数情况下崩溃。

此处的源代码：Codelabs Developers Google - Native Advanced Feed

附带的屏幕截图来自Android设备-型号：Redmi 7A，Android版本：9.0

主要问题：在实施本机高级Feed后，应用程序崩溃急剧增加，从而增加了该应用程序的卸载次数。

我尝试过的事情：

在8台设备上进行的Firebase Robo测试全部通过。

没有来自Google网上论坛线程的帮助：

1. Google Admob Ads Sdk
2. App freezes when Native Unified ads are loaded
3. NativeAdView.setNativeAd is slow and blocking the main thread

这是Firebase Crashlytics堆栈跟踪

Fatal Exception: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
       at androidx.fragment.app.FragmentManager.checkStateLoss(FragmentManager.java:11)
       at androidx.fragment.app.FragmentManager.enqueueAction(FragmentManager.java:26)
       at androidx.fragment.app.BackStackRecord.commitInternal(BackStackRecord.java:70)
       at androidx.fragment.app.BackStackRecord.commit(BackStackRecord.java:1)
       at in.careerdost.quiznew.recycler_activity.recycler_archived.loadMenu(recycler_archived.java:23)
       at in.careerdost.quiznew.recycler_activity.recycler_archived.access$100(recycler_archived.java)
       at in.careerdost.quiznew.recycler_activity.recycler_archived$1.onAdFailedToLoad(recycler_archived.java:24)
       at com.google.android.gms.internal.ads.zzvc.zzc(zzvc.java:6)
       at com.google.android.gms.internal.ads.zzws.zza(zzws.java:13)
       at com.google.android.gms.internal.ads.zzgt.onTransact(zzgt.java:22)
       at android.os.Binder.transact(Binder.java:914)
       at fw.b(fw.java:2)
       at com.google.android.gms.ads.internal.client.ai.a(ai.java:3)
       at com.google.android.gms.ads.nonagon.shim.m.a(m.java:4)
       at com.google.android.gms.ads.nonagon.shim.listeners.a.a(a.java)
       at com.google.android.gms.ads.nonagon.shim.loaders.g.run(g.java)
       at android.os.Handler.handleCallback(Handler.java:883)
       at android.os.Handler.dispatchMessage(Handler.java:100)
       at qh.a(qh.java)
       at com.google.android.gms.ads.internal.util.f.a(f.java:1)
       at qh.dispatchMessage(qh.java)
       at android.os.Looper.loop(Looper.java:237)
       at android.app.ActivityThread.main(ActivityThread.java:7814)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)

更新：onAdFailedToLoad和loadMenu方法

private void loadNativeAds() {
        AdLoader.Builder builder = new AdLoader.Builder(this,getString(R.string.ad_unit_id_native_advanced));
        adLoader = builder.forUnifiedNativeAd(
                unifiedNativeAd -> {
                    mNativeAds.add(unifiedNativeAd);
                    if (!adLoader.isLoading()) {
                        insertAdsInMenuItems();
                        loadMenu();
                    }
                }).withAdListener(
                new AdListener() {
                    @Override
                    //public void onAdFailedToLoad(int errorCode) {
                    public void onAdFailedToLoad(LoadAdError adError) {
                        Log.e("RecyclerPdf","The previous native ad failed to load. Attempting to load another.");
                        if (!adLoader.isLoading()) {
                            insertAdsInMenuItems();
                            loadMenu();
                        }
                    }
                }).build();
        adLoader.loadAds(new AdRequest.Builder().build(),NUMBER_OF_ADS);
    }

    private void insertAdsInMenuItems() {
        if (mNativeAds.size() <= 0) {
            return;
        }

        int offset = (mRecyclerViewItems.size() / mNativeAds.size()) + 1;
        int index = 0;
        for (UnifiedNativeAd ad : mNativeAds) {
            mRecyclerViewItems.add(index,ad);
            index = index + offset;
        }
        //loadMenu();
    }

    private void loadMenu() {
        Fragment newFragment = new recycler_view_fragment_pdf();
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.fragment_container_pdf,newFragment);
        transaction.addToBackStack(null);
        transaction.commit();
    }

用于在片段中调用Activity：

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRetainInstance(true);

        recycler_pdf activity = (recycler_pdf) getActivity();
        assert activity != null;
        mRecyclerViewItems = activity.getRecyclerViewItems();
    }

我的结论：我认为有时是由于连接缓慢，但不确定如何在此处实现。

任何帮助将不胜感激！谢谢！

解决方法

这里的问题是AdListener是一个独立的回调，它不了解Activity的生命周期。这里发生的是在某些情况下，当AdListener回调返回时，Activity已被销毁（也许用户只是按下了后退按钮），因此您在此Activity的Context上执行的任何操作都将崩溃，因为它现在无效。 AsyncTask也有同样的问题。

要避免这种情况，请在调用任何进一步的东西之前检查“活动是否有效”。可以通过：-

public void onAdFailedToLoad(LoadAdError adError) {
                    if (!adLoader.isLoading() && !isFinishing()) {
                        insertAdsInMenuItems();
                        loadMenu();
                    }
                }

对于活动，您可以使用isFinishing()进行检查。在片段中，您可以检查getActivity()或isAdded()。