admob rewarded video ads android example

XML (activity_main.xml)

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
tools:context=".after32.Rewardvideoads">

    <TextView
        android:id="@+id/text"
        android:gravity="center"
        android:layout_marginTop="50dp"
        android:layout_centerHorizontal="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="hello_world" />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/watch"
        android:text="show"
        android:layout_marginTop="50dp"
        android:layout_below="@+id/text"
        />


</RelativeLayout>

JAVA (MainActivity.java)

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.MobileAds;
import com.google.android.gms.ads.reward.RewardItem;
import com.google.android.gms.ads.reward.RewardedVideoAd;
import com.google.android.gms.ads.reward.RewardedVideoAdListener;
import com.tutorial.personal.androidstudiopro.R;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;



public class Rewardvideoads extends AppCompatActivity implements RewardedVideoAdListener {
    private Button mWatch;
    private TextView mText;
    private RewardedVideoAd mAd;
    int coin=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rewardvideoads);

        mWatch=(Button)findViewById(R.id.watch);
        mText=(TextView) findViewById(R.id.text);

        mWatch.setVisibility(View.INVISIBLE);

        mAd= MobileAds.getRewardedVideoAdInstance(this);
        mAd.setRewardedVideoAdListener(this);
        ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
        scheduler.scheduleAtFixedRate(new Runnable() {

            public void run() {
                runOnUiThread(new Runnable() {
                    public void run() {
                        if (!mAd.isLoaded()) {
                            loadAd();
                        } else {
                        }
                    }
                });
            }
        }, 3, 5, TimeUnit.SECONDS);


        mWatch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(mAd.isLoaded()){
                    mAd.show();
                }
            }
        });
    }

    public void loadAd(){
        if(!mAd.isLoaded()){
            mAd.loadAd("ca-app-pub-394454099942544/55445917",new AdRequest.Builder().build());
        }
    }



    @Override
    public void onRewardedVideoAdLoaded() {
        mWatch.setVisibility(View.VISIBLE);
        Toast.makeText(this, "Click this button for earn coin", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onRewardedVideoAdOpened() {
        Toast.makeText(this, "Rewarded Video Ad has opened", Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onRewardedVideoStarted() {
        Toast.makeText(this, "Watch full video for earn Coin", Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onRewardedVideoAdClosed() {
        Toast.makeText(this, "Rewarded Video Ad has closed", Toast.LENGTH_SHORT).show();
        loadAd();
        mWatch.setVisibility(View.INVISIBLE);

    }

    @Override
    public void onRewarded(RewardItem rewardItem) {
         coin=coin+rewardItem.getAmount();
        mText.setText("Your coin : "+coin);
    }

    @Override
    public void onRewardedVideoAdLeftApplication() {
        Toast.makeText(this, "Rewarded Video Ad has closed", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onRewardedVideoAdFailedToLoad(int i) {

    }

    @Override
    public void onRewardedVideoCompleted() {
    }

    @Override
    public void onPause() {
        super.onPause();
        mAd.pause(this);
    }

    @Override
    public void onResume() {
        super.onResume();
        mAd.resume(this);
        loadAd();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mAd.destroy(this);
    }

    @Override
    protected void onStart() {
        loadAd();
        super.onStart();
    }
}