종료시 팝업으로 광고 보여줄때 좀 늦게 뜨는문제 어떻게 해결할 수 있을가요?

Question

package com.mypack;

import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.TextView;


import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;






public class NativeAdDialog extends DialogFragment {

    TextView quit;

    TextView cancel;

    AdView adView;

    private static NativeAdDialog frag = null;

    public static NativeAdDialog getInstance() {
        if (frag == null) {
            frag = new NativeAdDialog();
        }
        return frag;
    }

    public static boolean isFirst = true;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        if (getDialog() != null) {
            getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);
            getDialog().getWindow().setBackgroundDrawableResource(android.R.color.transparent);
        }

        View root = inflater.inflate(R.layout.dialog_native_ad, container, false);



        quit = (TextView)root.findViewById(R.id.dialog_button_app_quit);
        cancel = (TextView)root.findViewById(R.id.dialog_button_app_quit_cancel);
        adView = (AdView)root.findViewById(R.id.dialog_native_ad);

        try {
            MobileAds.initialize(M1Activity.getInstance(),
                    "ca-app-pub-83485734573454~234234523");

            AdRequest request = new AdRequest.Builder().build();
            adView.loadAd(request);
        }catch(Exception e){
            //광고 로드 예외 발생
        }

        quit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                android.os.Process.killProcess(android.os.Process.myPid());
            }
        });

        cancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dismissAllowingStateLoss();
            }
        });



        return root;
    }

    @Override
    public void onResume(){
        super.onResume();

        if(isFirst){
            isFirst = false;
            NativeAdDialog.getInstance().dismissAllowingStateLoss();
        }
    }

    @SuppressWarnings("deprecation")
    @Override
    public void onStart() {
        super.onStart();
    }


}

메인액티비티에서 이렇게 호출하여 다이얼로그를 띄운후 팝업내부에서 광고를 초기화하고 바로 dismiss 를 하고있습니다.

NativeAdDialog.getInstance().show(MainActivity.getInstance().getSupportFragmentManager(),"dlg_exit");

 

위의 방법으로 했더니 광고가 늦게뜨는데요

종료팝업에서 광고가 바로 뜨게할 수 있는 방법이 있을가요?