An helper class to load interstitial and overwall DU AD

DuAdHelper.java

import android.app.Activity;
import android.content.Intent;
import android.util.Log;

import com.duapps.ad.AbsInterstitialListener;
import com.duapps.ad.InterstitialAd;
import com.duapps.ad.offerwall.ui.OfferWallAct;

/**
 * @author hendrawd on 6/24/16
 */
public class DuAdHelper {

    private static final String TAG = DuAdHelper.class.getSimpleName();
    private static final InterstitialAd.Type AD_TYPE = InterstitialAd.Type.SCREEN;
    private static InterstitialAd interstitialAd;

    private static InterstitialAd getInterstitialAd(Activity activity, int pid) {
        if (interstitialAd == null) {
            interstitialAd = new InterstitialAd(activity, pid, AD_TYPE);
        }
        return interstitialAd;
    }

    public static void fillInterstitial(Activity activity, int pid) {
        getInterstitialAd(activity, pid).fill();
    }

    public static void showInterstitial(Activity activity, int pid) {
        getInterstitialAd(activity, pid).setInterstitialListener(new AbsInterstitialListener() {
            @Override
            public void onAdFail(int errCode) {
                Log.d(TAG, "call to onAdFail, errCode(" + errCode + ")");
            }

            @Override
            public void onAdReceive() {
                Log.d(TAG, "call to onAdReceive()!");
                interstitialAd.show();
            }
        });
        interstitialAd.load();
    }

    /**
     * Call this method from the caller Activity's onStop()
     */
    public static void closeInterstitial() {
        if (interstitialAd != null) {
            interstitialAd.close();
        }
    }

    /**
     * Call this method from the caller Activity's onDestroy()
     */
    public static void destroyInterstitial() {
        if (interstitialAd != null) {
            interstitialAd.destory();
        }
    }

    public static void showOverwall(Activity activity, int pid) {
        Intent intent = new Intent(activity, OfferWallAct.class);
        intent.putExtra("pid", pid);
        activity.startActivity(intent);
    }
}