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 <meta-data> 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-dataandroid: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() {@Overridepublic 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() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 0://    显示广告showJiliad();break;case 1://测试加载jswebview.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() {@Overridepublic 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(){@Overridepublic 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 ;@Overridepublic void onPageFinished(WebView view, String url){//结束super.onPageFinished(view, url);Log.d("TAG", "加载结束");if(r == 10){showAD();}}@Overridepublic 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() {@Overridepublic void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {// Handle the error.Log.d("TAG", loadAdError.toString());mRewardedAd = null;}@Overridepublic void onAdLoaded(@NonNull RewardedAd rewardedAd) {mRewardedAd = rewardedAd;Log.d("TAG", "Ad was loaded.");mRewardedAd.setFullScreenContentCallback(new FullScreenContentCallback() {@Overridepublic void onAdClicked() {// 在为广告记录点击时调用。Log.d("TAG", "Ad was clicked.");}@Overridepublic 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;}@Overridepublic void onAdFailedToShowFullScreenContent(AdError adError) {// 广告无法展示时调用Log.e("TAG", "Ad failed to show fullscreen content.");mRewardedAd = null;}@Overridepublic void onAdImpression() {// 在为广告记录展示时调用Log.d("TAG", "Ad recorded an impression.");}@Overridepublic 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*/@JavascriptInterfacepublic 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*/@JavascriptInterfacepublic 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