Broken colors in DayNight Theme after loading Admob/Firebase ad

Question

I use Theme.AppCompat.DayNight.NoActionBar theme for my app. When I load adMob interstital some colors are broken in "night" mode (i.e. in RecyclerView).

Screen:

Those incorrect colors are from "notnight" values. When I close the app and run it again everything is okay. When I kill the app I have the same situation.

Activity code:

public class MainActivity extends AppCompatActivity {

    static {
        AppCompatDelegate.setDefaultNightMode(
                AppCompatDelegate.MODE_NIGHT_AUTO);
    }

    private ArrayList<String> planetList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_main);

        populateRecycler();

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);

        PlanetAdapter adapter = new PlanetAdapter(planetList, getApplicationContext());
        recyclerView.setAdapter(adapter);

        InterstitialAd interstitialAd = new InterstitialAd(this);
        interstitialAd.setAdUnitId("ca-app-pub-543543543/543543543");
        AdRequest adRequest = new AdRequest.Builder().build();
        interstitialAd.loadAd(adRequest);
    }

    private void populateRecycler() {
        for (int i = 0; i < 20; i++) {
            planetList.add("TEST");
        }
    }

}

When I comment interstitialAd.loadAd(adRequest) everything is ok.

You can find whole project here: github

Answer 1

The issue is supposedly caused by the WebView resetting the UI mode, and this can be worked around by instantiating WebView manually.

I haven't seen the issue after doing this (in Application.oncreate() in this particular app):

    if (nightMode != AppCompatDelegate.MODE_NIGHT_NO) {
        Log.d(TAG, "Manually instantiating WebView to avoid night mode issue.");
        try {
            new WebView(getApplicationContext());
        } catch (Exception e) {
            Log.e(TAG, "Got exception while trying to instantiate WebView to avoid night mode issue. Ignoring problem.", e);
        }
    }
    AppCompatDelegate.setDefaultNightMode(nightMode);

Source: https://groups.google.com/forum/#!msg/google-admob-ads-sdk/OZzHq_-wAFY/K50jClZcBAAJ