Admobのリワードが実装ができないので実装方法を教えてください。

Question

AndroidStudioを使ってAndroidアプリの作成をしています。
リワードが始まりません。

AndroidManifestとbuild.gradleには、テストコード挿入済みです。
エラーなしです。

ソースコード

package com.example.douga;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.Log;
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.google.android.gms.ads.rewarded.RewardedAd;

public class MainActivity extends AppCompatActivity implements RewardedVideoAdListener {

    private static final String AD_UNIT_ID = "ca-app-pub-3940256099942544/5224354917";
    private static final String APP_ID = "ca-app-pub-3940256099942544~3347511713";

    private static final String TAG = "MainActivity";
    TextView textView;
    private CountDownTimer mCountDownTimer;
    private static long SET_TIME = 10;
    private long timeRemaining;
    private RewardedVideoAd rewardedVideoAd;


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

        textView = (TextView) findViewById(R.id.textView);

        MobileAds.initialize(this, APP_ID);
        rewardedVideoAd = MobileAds.getRewardedVideoAdInstance(this);///
        rewardedVideoAd.setRewardedVideoAdListener(this);///
        loadRewardedVideoAd();

        timer(SET_TIME);
    }
    private void timer(long time) {
        mCountDownTimer = new CountDownTimer(time * 1000, 1000) {

            public void onTick(long millisUntilFinished) {
                timeRemaining = millisUntilFinished/1000;
                textView.setText("seconds remaining: " + timeRemaining);
            }

            public void onFinish() {
                textView.setText("done!");
                //動画広告
                showRewardedVideo();

            }

        }.start();
    }

    private void loadRewardedVideoAd() {
        if (!rewardedVideoAd.isLoaded()) {
            rewardedVideoAd.loadAd(AD_UNIT_ID, new AdRequest.Builder().build());
        }
    }
    private void showRewardedVideo() {
        if (rewardedVideoAd.isLoaded()) {
            rewardedVideoAd.show();
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, "★onStart");

    }

    @Override
    protected void onRestart(){
        super.onRestart();
        Log.i(TAG, "★onRestart");
        timer(timeRemaining);
    }

    @Override
    protected void onResume() {
        super.onResume();
        Toast.makeText(this, "onResume", Toast.LENGTH_SHORT).show();
        Log.i(TAG, "★onResume");

    }

    @Override
    protected void onPause() {
        super.onPause();
        Toast.makeText(this, "onPause", Toast.LENGTH_SHORT).show();
        Log.i(TAG, "★onPause");

    }

    @Override
    protected void onStop() {
        super.onStop();
        Toast.makeText(this, "onStop", Toast.LENGTH_SHORT).show();
        Log.i(TAG, "★onStop");

        mCountDownTimer.cancel();
    }

    //広告の準備完了
    @Override
    public void onRewardedVideoAdLoaded() {
        Toast.makeText(this, "onRewardedVideoAdLoaded", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewardedVideoAdLoaded : ");
    }

    //広告へ移動するとき
    @Override
    public void onRewardedVideoAdOpened() {
        Toast.makeText(this, "onRewardedVideoAdOpened", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewardedVideoAdOpened : ");
    }

    //広告再生
    @Override
    public void onRewardedVideoStarted() {
        Toast.makeText(this, "onRewardedVideoStarted", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewardedVideoStarted : ");
    }

    @Override
    public void onRewardedVideoAdClosed() {
        Toast.makeText(this, "広告視聴ありがとうございました", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewardedVideoAdClosed : ");

    }

    @Override
    public void onRewarded(RewardItem rewardItem) {
        Toast.makeText(this, "Yes! I GOT", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewarded : ");
    }

    //広告から離れるとき
    @Override
    public void onRewardedVideoAdLeftApplication() {
        Toast.makeText(this, "onRewardedVideoAdLeftApplication", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewardedVideoAdLeftApplication : ");
    }

    @Override
    public void onRewardedVideoAdFailedToLoad(int i) {
        Toast.makeText(this, "onRewardedVideoAdFailedToLoad", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewardedVideoAdFailedToLoad : ");
    }

    @Override
    public void onRewardedVideoCompleted() {
        Toast.makeText(this, "onRewardedVideoCompleted", Toast.LENGTH_SHORT).show();
        Log.i(TAG,"onRewardedVideoCompleted : ");
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="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=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:textSize="25dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/myButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

myButtonにshowRewardedVideo();を入れたらできました。

findViewById(R.id.myButton).setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View V){
showRewardedVideo();
}
});