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Custom Events in Admob Mediattion adding unsupported Ad Networks
public class CustomEvent implements CustomEventBanner, AdListener{

private CustomEventBannerListener bannerListener;
private AdView adView;

@Override
public void requestBannerAd(final CustomEventBannerListener listener,
        final Activity activity,
        String label,
        String serverParameter,
        AdSize adSize,
        MediationAdRequest mediationAdRequest) {
    // Keep the custom event listener for use later.
    this.bannerListener = listener;

    // Determine the best ad format to use given the adSize. If the adSize
    // isn't appropriate for any format, an ad will not fill.
    AdSize bestAdSize = adSize = adSize.findBestSize(
            AdSize.BANNER,
            AdSize.IAB_BANNER,
            AdSize.IAB_LEADERBOARD,
            AdSize.IAB_MRECT,
            AdSize.IAB_WIDE_SKYSCRAPER);
    if (bestAdSize == null) {
        listener.onFailedToReceiveAd();
        return;
    }

    // Initialize an AdView with the bestAdSize and the publisher ID.
    // The publisher ID is the server parameter that you gave when creating
    // the custom event.
    this.adView = new AdView(activity, bestAdSize, serverParameter);

    // Set the listener to register for events.
    this.adView.setAdListener(this);
    // Generate an ad request using custom targeting values provided in the
    // MediationAdRequest.
    AdRequest adRequest = new AdRequest()
    .setBirthday(mediationAdRequest.getBirthday())
    .setGender(mediationAdRequest.getGender())
    .setKeywords(mediationAdRequest.getKeywords())
    .setLocation(mediationAdRequest.getLocation());
    if (mediationAdRequest.isTesting()) {
        adRequest.addTestDevice(AdRequest.TEST_EMULATOR);
    }

    // Load the ad with the ad request.
    this.adView.loadAd(adRequest);
}

@Override
public void onReceiveAd(Ad ad) {
    this.bannerListener.onReceivedAd(this.adView);
}

@Override
public void onFailedToReceiveAd(Ad ad, ErrorCode errorCode) {
    this.bannerListener.onFailedToReceiveAd();
}

@Override
public void onPresentScreen(Ad ad) {
    this.bannerListener.onClick();
    this.bannerListener.onPresentScreen();
}

@Override
public void onDismissScreen(Ad ad) {
    this.bannerListener.onDismissScreen();
}

@Override
public void onLeaveApplication(Ad ad) {
    this.bannerListener.onLeaveApplication();
}


}