H5页面调用admob激励视频，用户获取奖励

https://developers.google.com/admob/android/rewarded?hl=zh-cn#set_the_fullscreencontentcallback

应用前提条件

• 使用 Android Studio 3.2 或更高版本

• 确保您应用的 build 文件使用以下值：

  • minSdkVersion 为 16 或更高版本
  • compileSdkVersion 为 28 或更高版本

1，在您的项目级 build.gradle 文件中，同时在 buildscript 和 allprojects 两个部分中添加

buildscript {
    repositories {
        google()
        mavenCentral()
    }
}
 
allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

2，将 Google 移动广告 SDK 的依赖项添加到您的模块的应用级 Gradle 文件，通常为 app/build.gradle：

dependencies {
  implementation 'com.google.android.gms:play-services-ads:21.0.0'
}

3，将您的 AdMob 应用 ID（可在 AdMob 界面中找到）添加到应用的 AndroidManifest.xml 文件中。为此，请添加包含 android:name="com.google.android.gms.ads.APPLICATION_ID" 的  代码。您可以在 AdMob 界面中找到您的应用 ID。对于 android:value，请插入您自己的 AdMob 应用 ID，并用英文引号括起来。

测试ID：ca-app-pub-3940256099942544~3347511713

注意：开发工程一定要使用测试ID，不要使用线上ID，否则可能导致线上admob广告流量无效，最严重导致封号！

<manifest>
    <application>
        <!-- Sample AdMob app ID: ca-app-pub-3940256099942544~3347511713 -->
        <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="ca-app-pub-xxxxxxxxxxxxxxxx~yyyyyyyyyy"/>
    </application>
</manifest>

4，初始化广告和预加载激励视频

import com.google.android.gms.ads.MobileAds;
import com.google.android.gms.ads.initialization.InitializationStatus;
import com.google.android.gms.ads.initialization.OnInitializationCompleteListener;
 
public class MainActivity extends AppCompatActivity {
 
    private AdRequest adRequest;
 
    private Handler mHandler;
    private WebView webview;
 
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });
        
        
         adRequest = new AdRequest.Builder().build();
         loadJiliAd();
 
 
         //ad必须在主线程上，使用消息通知调用
         mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case 0:
                        //    显示广告
                        showJiliad();
                        break;
                    case 1:
                        //测试加载js
                        webview.loadUrl("javascript:test()");
                        break;
 
                    default:
                        break;
                }
            }
        };
 
        //加载页面        
         showWeb();
   
 
    }
 
    private void showJiliad(){
        if (mRewardedAd != null) {
            Activity activityContext = this;
            mRewardedAd.show(activityContext, new OnUserEarnedRewardListener() {
                @Override
                public void onUserEarnedReward(@NonNull RewardItem rewardItem) {
                    // 用户获得奖励
                    Log.d("TAG", "The user earned the reward.");
                    int rewardAmount = rewardItem.getAmount();
                    String rewardType = rewardItem.getType();
                    showJiangli("恭喜获得奖励");
 
 
                }
            });
        }else{
            showJiangli("广告拉取中，请稍候再试");
            loadJiliAd();
        }
    }
    private void showJiangli(String msg){
        Toast.makeText(this,msg,Toast.LENGTH_SHORT).show();
    }
 
 
    private void showWeb(){
        
 
        //实例化WebView对象
        webview = new WebView(this);
        //设置WebView属性，能够执行Javascript脚本
 
        WebSettings webSettings = webview.getSettings();
        webSettings.setJavaScriptEnabled(true);
 
        //加载页面 
        webview.loadUrl("https://xxx.com/");
 
        //WebAppInterface 是我们自定义的一个类，通过实例化一个WebAppInterface 对象来和html进行绑定
        WebAppInterface webAppInterface = new WebAppInterface(this,mHandler);
        webview.addJavascriptInterface(webAppInterface, "Android");
 
 
        webview.setWebViewClient(new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url){
                view.loadUrl(url);
                return true;
            }
        });
 
 
 
        webview.setWebViewClient(new WebViewClient()
        {
            Random ra =new Random();
            int r =  ra.nextInt(20) + 1 ;
 
            @Override
            public void onPageFinished(WebView view, String url)
            {
                //结束
                super.onPageFinished(view, url);
                Log.d("TAG", "加载结束");
 
                if(r == 10){
                    showAD();
                }
            }
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon)
            {
                //开始
                super.onPageStarted(view, url, favicon);
                Log.d("TAG", "加载开始");
                num ++;
                if(r == 6){
                    if (mInterstitialAd != null) {
                        showAD();
                    }
                }else if(num  >= 6){
                    if (mInterstitialAd != null) {
                        num =0;
                        showAD();
                    }else{
                        Log.d("TAG", "广告未加载成功");
                    }
                }
 
 
                Log.d("TAG", "加载NUM:" + String.valueOf(num));
 
            }
        });
 
    private void loadJiliAd(){
        RewardedAd.load(this, "ca-app-pub-3940256099942544/5224354917",
            adRequest, new RewardedAdLoadCallback() {
                @Override
                public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
                    // Handle the error.
                    Log.d("TAG", loadAdError.toString());
                    mRewardedAd = null;
                }
 
                @Override
                public void onAdLoaded(@NonNull RewardedAd rewardedAd) {
                    mRewardedAd = rewardedAd;
                    Log.d("TAG", "Ad was loaded.");
 
                    mRewardedAd.setFullScreenContentCallback(new FullScreenContentCallback() {
                        @Override
                        public void onAdClicked() {
                            // 在为广告记录点击时调用。
                            Log.d("TAG", "Ad was clicked.");
                        }
 
                        @Override
                        public void onAdDismissedFullScreenContent() {
                            // 当广告被关闭时调用.
                            // 将广告引用设置为 null，这样您就不会再次展示广告。
                            Log.d("TAG", "Ad dismissed fullscreen content.");
                            mRewardedAd = null;
                        }
 
                        @Override
                        public void onAdFailedToShowFullScreenContent(AdError adError) {
                            // 广告无法展示时调用
                            Log.e("TAG", "Ad failed to show fullscreen content.");
                            mRewardedAd = null;
                        }
 
                        @Override
                        public void onAdImpression() {
                            // 在为广告记录展示时调用
                            Log.d("TAG", "Ad recorded an impression.");
                        }
 
                        @Override
                        public void onAdShowedFullScreenContent() {
                            // 显示广告时调用.
                            Log.d("TAG", "Ad showed fullscreen content.");
 
                        }
                    });
                }
            });
    }
}

6，webAppInterface类

public class WebAppInterface {
    Activity mContext;
 
    Handler mHandler;
    /**
     * Instantiate the interface and set the context
     */
    WebAppInterface(Activity c,Handler r) {
        mContext = c;
        mHandler = r;
    }
 
    /**
     * js调用Android的函数
     */
    @JavascriptInterface
    public void startFunction() {
        Toast.makeText(mContext,"我是安卓原生的弹窗",Toast.LENGTH_SHORT).show();
 
        //调用激励视频广告
        Message msg = new Message();
        msg.what = 0;
        mHandler.sendMessage(msg);
 
    }
    /**
     * js调用Android的函数并给Android原生传递一个参数
     */
    @JavascriptInterface
    public void  startFunction(String arg) {
        Toast.makeText(mContext,arg,Toast.LENGTH_SHORT).show();
    }
}

7，html调用激励奖励

 <input type="button" value="点击调用android代码，拉取激励视频"  
   onclick="window.Android.startFunction()"/>

整体流程结束，业务代码可按需自行添加