[android] hack to workaround the use of AsyncTask.SERIAL_EXECUTOR ins…

…ide MoPub initialization

android/src/com/frostwire/android/offers/MoPubAdNetwork.java

@@ -19,6 +19,7 @@

import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;

@@ -34,12 +35,15 @@
import com.mopub.common.privacy.ConsentStatus;
import com.mopub.common.privacy.ConsentStatusChangeListener;
import com.mopub.common.privacy.PersonalInfoManager;
import com.mopub.common.util.Reflection;
import com.mopub.mobileads.AdMobBannerAdapter;
import com.mopub.mobileads.AdMobInterstitialAdapter;
import com.mopub.mobileads.MoPubErrorCode;
import com.mopub.mobileads.MoPubInterstitial;

import java.lang.ref.WeakReference;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
@@ -87,7 +91,9 @@ public void initialize(Activity activity) {
                        new AdMobBannerAdapter.GooglePlayServicesMediationSettings(npaBundle),
                        new AdMobInterstitialAdapter.GooglePlayServicesMediationSettings(npaBundle))
                .build();
        fixExecutor(true);
        MoPub.initializeSdk(activity, sdkConfiguration, () -> {
            fixExecutor(false);
            LOG.info("MoPub initialization finished");
            starting = false;
            start();
@@ -97,6 +103,25 @@ public void initialize(Activity activity) {
        LOG.info("initialize() MoPub.initializeSdk invoked, starting=" + starting + ", started=" + started());
    }

    private void fixExecutor(boolean change) {
        try {
            LOG.info("MoPub -> fixExecutor with change=" + change);
            Field f = Reflection.getPrivateField(AsyncTask.class, "sDefaultExecutor");

            Field modifiersField = Field.class.getDeclaredField("accessFlags");
            modifiersField.setAccessible(true);
            modifiersField.setInt(f, f.getModifiers() & ~Modifier.FINAL);

            if (change) {
                f.set(null, AsyncTask.THREAD_POOL_EXECUTOR);
            } else {
                f.set(null, AsyncTask.SERIAL_EXECUTOR);
            }
        } catch (Exception e) {
            LOG.info("MoPub -> fixExecutor error change=" + change + " msg=" + e.getMessage());
        }
    }

    private static void loadConsentDialogAsync(MoPubAdNetwork mopubAdNetwork) {
        PersonalInfoManager personalInfoManager = MoPub.getPersonalInformationManager();
        //personalInfoManager.forceGdprApplies(); //uncomment to test in the US