IMA DAI SDK 使用入门

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借助 IMA SDK,您可以轻松地将多媒体广告集成到您的网站和应用中。IMA SDK 可以从任何符合 VAST 标准的广告服务器请求广告,并在您的应用中管理广告播放。借助 IMA DAI SDK,应用可以为广告和内容视频(VOD 或直播内容)发出视频流请求。然后,SDK 会返回一个组合的视频流,因此您无需管理应用中的广告和内容视频之间的切换。

本指南介绍了如何将 IMA SDK 集成到一个简单的视频播放器应用中。如果您想要查看或遵循已完成的示例集成,请从 GitHub 下载基本示例

IMA DAI 概览

实现 IMA DAI 涉及到四个主要 SDK 组件,本指南对此进行了演示:

  • StreamDisplayContainer:一种容器对象,它位于视频播放元素之上,用于存放广告界面元素。
  • AdsLoader:用于请求数据流并处理由数据流请求响应对象触发的事件的对象。 您只能实例化一个广告加载器,而且该加载器可以在应用的整个生命周期中重复使用。
  • StreamRequest:定义流请求的对象。视频流请求可以用于视频点播或直播。请求会指定内容 ID,以及 API 密钥或身份验证令牌和其他参数。
  • StreamManager:处理动态广告插播流以及与 DAI 后端互动的对象。流管理器还会处理跟踪 ping,并将流和广告事件转发给发布商。

前提条件

下载并运行示例视频播放器应用

示例应用提供了一个可播放 HLS 视频的正常运行视频播放器。您可以从这里开始集成 IMA Android SDK 的 DAI 功能。

  1. 下载示例视频播放器应用并解压缩。
  2. 启动 Android Studio,然后选择 Open an existing Android Studio project;如果 Android Studio 已在运行,请依次选择 File > New > Import Project。然后选择 SampleVideoPlayer/build.gradle
  3. 依次选择 Tools > Android > Sync Project with Gradle Files 以运行 Gradle 同步。
  4. 通过依次点击 Run > Run 'app',确保播放器应用在 Android 实体设备或 Android 虚拟设备上编译和运行。视频流加载需要一些时间才能正常播放。

检查示例视频播放器

示例视频播放器尚无任何 IMA SDK 集成代码。该示例应用包含两个主要部分:

  • samplevideoplayer/SampleVideoPlayer.java - 基于 ExoPlayer 的简单 HLS 播放器,可用作 IMA DAI 集成的基础。
  • videoplayerapp/MyActivity.java - 此 Activity 会创建视频播放器,并向其传递 ContextSimpleExoPlayerView

将 IMA Android SDK 添加到播放器应用中

此外,您还必须添加对 IMA SDK 的引用。在 Android Studio 中,将以下内容添加到位于 app/build.gradle 的应用级 build.gradle 文件中:

repositories {
  google()
  jcenter()
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.browser:browser:1.3.0'
    implementation 'com.google.android.exoplayer:exoplayer:2.18.1'
    implementation 'com.google.ads.interactivemedia.v3:interactivemedia:3.29.0'
}

检查点:您的应用应编译和运行,但尚未添加用于请求和展示广告的界面元素或代码。

集成 IMA SDK

  1. videoplayerapp 软件包中(在 app/java/com.google.ads.interactivemedia.v3.samples/videoplayerapp/ 中)创建一个名为 SampleAdsWrapper 的新类,以封装现有的 SampleVideoPlayer,并添加实现 IMA 动态广告插播 (DAI) 的逻辑。为此,您必须先创建一个 AdsLoader,用于向广告服务器请求广告。

    videoplayerapp/SampleAds 封装容器.java

    package com.google.ads.interactivemedia.v3.samples.videoplayerapp;
    
    import android.annotation.TargetApi;
    import android.content.Context;
    import android.os.Build;
    import android.view.ViewGroup;
    import android.webkit.WebView;
    
    import com.google.ads.interactivemedia.v3.api.AdErrorEvent;
    import com.google.ads.interactivemedia.v3.api.AdEvent;
    import com.google.ads.interactivemedia.v3.api.AdsLoader;
    import com.google.ads.interactivemedia.v3.api.AdsManagerLoadedEvent;
    import com.google.ads.interactivemedia.v3.api.CuePoint;
    import com.google.ads.interactivemedia.v3.api.ImaSdkFactory;
    import com.google.ads.interactivemedia.v3.api.ImaSdkSettings;
    import com.google.ads.interactivemedia.v3.api.StreamDisplayContainer;
    import com.google.ads.interactivemedia.v3.api.StreamManager;
    import com.google.ads.interactivemedia.v3.api.StreamRequest;
    import com.google.ads.interactivemedia.v3.api.player.VideoProgressUpdate;
    import com.google.ads.interactivemedia.v3.api.player.VideoStreamPlayer;
    import com.google.ads.interactivemedia.v3.samples.samplevideoplayer.SampleVideoPlayer;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    
    public class SampleAdsWrapper implements AdEvent.AdEventListener,
            AdErrorEvent.AdErrorListener, AdsLoader.AdsLoadedListener {
    
        // Live stream asset key.
        private static final String TEST_ASSET_KEY = "sN_IYUG8STe1ZzhIIE_ksA";
    
        // VOD content source and video IDs.
        private static final String TEST_CONTENT_SOURCE_ID = "2528370";
        private static final String TEST_VIDEO_ID = "tears-of-steel";
    
        private static final String PLAYER_TYPE = "DAISamplePlayer";
    
        /**
         * Log interface, so you can output the log commands to the UI or similar.
         */
        public interface Logger {
            void log(String logMessage);
        }
    
        private ImaSdkFactory sdkFactory;
        private AdsLoader adsLoader;
        private StreamDisplayContainer displayContainer;
        private StreamManager streamManager;
        private List<VideoStreamPlayer.VideoStreamPlayerCallback> playerCallbacks;
    
        private SampleVideoPlayer videoPlayer;
        private Context context;
        private ViewGroup adUiContainer;
    
        private String fallbackUrl;
        private Logger logger;
    
        public SampleAdsWrapper(Context context, SampleVideoPlayer videoPlayer,
                                ViewGroup adUiContainer) {
            this.videoPlayer = videoPlayer;
            this.context = context;
            this.adUiContainer = adUiContainer;
            sdkFactory = ImaSdkFactory.getInstance();
            playerCallbacks = new ArrayList<>();
            createAdsLoader();
            displayContainer = sdkFactory.createStreamDisplayContainer(
                this.adUiContainer,
                videoStreamPlayer
            );
        }
    
        private void createAdsLoader() {
            ImaSdkSettings settings = new ImaSdkSettings();
            adsLoader = sdkFactory.createAdsLoader(context);
        }
    
        public void requestAndPlayAds() {
            adsLoader.addAdErrorListener(this);
            adsLoader.addAdsLoadedListener(this);
            adsLoader.requestStream(buildStreamRequest());
        }
    }
              
  2. AdsLoader 添加 buildStreamRequest() 方法,以便它可以请求包含广告的流。此直播可以是包含广告的直播(默认设置),也可以是随广告一起播放预先录制的内容的视频点播 (VOD) 直播。如需启用 VOD 视频流,请注释掉相应的直播请求,并取消对 VOD 视频流请求的注释。

    videoplayerapp/SampleAds 封装容器.java

    private StreamRequest buildStreamRequest() {
        VideoStreamPlayer videoStreamPlayer = createVideoStreamPlayer();
        videoPlayer.setSampleVideoPlayerCallback(
                new SampleVideoPlayer.SampleVideoPlayerCallback() {
                    @Override
                    public void onUserTextReceived(String userText) {
                        for (VideoStreamPlayer.VideoStreamPlayerCallback callback :
                                playerCallbacks) {
                            callback.onUserTextReceived(userText);
                        }
                    }
    
                    @Override
                    public void onSeek(int windowIndex, long positionMs) {
                        // See if you would seek past an ad, and if so, jump back to it.
                        long newSeekPositionMs = positionMs;
                        if (streamManager != null) {
                            CuePoint prevCuePoint  =
                                    streamManager.getPreviousCuePointForStreamTime(positionMs / 1000);
                            if (prevCuePoint != null && !prevCuePoint.isPlayed()) {
                                newSeekPositionMs = (long) (prevCuePoint.getStartTime() * 1000);
                            }
                        }
                        videoPlayer.seekTo(windowIndex, newSeekPositionMs);
                    }
    
                    @Override
                    public void onContentComplete() {
                        for (VideoStreamPlayer.VideoStreamPlayerCallback callback : playerCallbacks) {
                            callback.onContentComplete();
                        }
                    }
    
                    @Override
                    public void onPause() {
                        for (VideoStreamPlayer.VideoStreamPlayerCallback callback : playerCallbacks) {
                            callback.onPause();
                        }
                    }
    
                    @Override
                    public void onResume() {
                        for (VideoStreamPlayer.VideoStreamPlayerCallback callback : playerCallbacks) {
                            callback.onResume();
                        }
                    }
    
                    @Override
                    public void onVolumeChanged(int percentage) {
                        for (VideoStreamPlayer.VideoStreamPlayerCallback callback : playerCallbacks) {
                            callback.onVolumeChanged(percentage);
                        }
                    }
                });
    
        // Live stream request.
        StreamRequest request = sdkFactory.createLiveStreamRequest(
                TEST_ASSET_KEY, null, displayContainer);
    
        // VOD request. Comment the createLiveStreamRequest() line above and uncomment this
        // createVodStreamRequest() below to switch from a live stream to a VOD stream.
        // StreamRequest request = sdkFactory.createVodStreamRequest(TEST_CONTENT_SOURCE_ID,
        //        TEST_VIDEO_ID, null, displayContainer);
        return request;
    }
    
  3. 您还需要一个 VideoStreamPlayer 才能播放该流,因此请添加 createVideoStreamPlayer() 方法,以创建一个实现 VideoStreamPlayer 的匿名类。

    videoplayerapp/SampleAds 封装容器.java

    private VideoStreamPlayer createVideoStreamPlayer() {
        VideoStreamPlayer player = new VideoStreamPlayer() {
            @Override
            public void loadUrl(String url, List<HashMap<String, String>> subtitles) {
                videoPlayer.setStreamUrl(url);
                videoPlayer.play();
            }
    
            @Override
            public void addCallback(
                VideoStreamPlayerCallback videoStreamPlayerCallback) {
                    playerCallbacks.add(videoStreamPlayerCallback);
            }
    
            @Override
            public void removeCallback(
                VideoStreamPlayerCallback videoStreamPlayerCallback) {
                    playerCallbacks.remove(videoStreamPlayerCallback);
            }
    
            @Override
            public void onAdBreakStarted() {
                // Disable player controls.
                videoPlayer.enableControls(false);
                log("Ad Break Started\n");
            }
    
            @Override
            public void onAdBreakEnded() {
                // Re-enable player controls.
                videoPlayer.enableControls(true);
                log("Ad Break Ended\n");
            }
    
            @Override
            public VideoProgressUpdate getContentProgress() {
                return new VideoProgressUpdate(videoPlayer.getCurrentPosition(),
                        videoPlayer.getDuration());
            }
        };
        return player;
    }
    
  4. 实现所需的监听器并添加对错误处理的支持。

    重要提示:请注意 AdErrorListener 实现,因为它会在广告无法播放时调用后备网址。由于内容和广告位于同一视频流中,因此您必须准备好在 DAI 视频流出错时调用后备视频流。

    videoplayerapp/SampleAds 封装容器.java

    /** AdErrorListener implementation **/
    @Override
    public void onAdError(AdErrorEvent event) {
        // play fallback URL.
        videoPlayer.setStreamUrl(fallbackUrl);
        videoPlayer.enableControls(true);
        videoPlayer.play();
    }
    
    /** AdEventListener implementation **/
    @Override
    public void onAdEvent(AdEvent event) {
        switch (event.getType()) {
            case AD_PROGRESS:
                // Do nothing or else log are filled by these messages.
                break;
            default:
                log(String.format("Event: %s\n", event.getType()));
                break;
        }
    }
    
    /** AdsLoadedListener implementation **/
    @Override
    public void onAdsManagerLoaded(AdsManagerLoadedEvent event) {
        streamManager = event.getStreamManager();
        streamManager.addAdErrorListener(this);
        streamManager.addAdEventListener(this);
        streamManager.init();
    }
    
    /** Sets fallback URL in case ads stream fails. **/
    void setFallbackUrl(String url) {
        fallbackUrl = url;
    }
    
  5. 添加用于日志记录的代码。

    videoplayerapp/SampleAds 封装容器.java

    /** Sets logger for displaying events to screen. Optional. **/
    void setLogger(Logger logger) {
        this.logger = logger;
    }
    
    private void log(String message) {
        if (logger != null) {
            logger.log(message);
        }
    }
    
  6. 修改 videoplayerapp 中的 MyActivity 以进行实例化并调用 SampleAdsWrapper

    videoplayerapp/MyActivity.java

    import android.view.ViewGroup;
    import android.widget.ScrollView;
    …
    public class MyActivity extends AppCompatActivity {
    …
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_my);
            View rootView = findViewById(R.id.videoLayout);
            videoPlayer = new SampleVideoPlayer(rootView.getContext(),
                    (SimpleExoPlayerView) rootView.findViewById(R.id.playerView));
            videoPlayer.enableControls(false);
    
            final SampleAdsWrapper sampleAdsWrapper = new SampleAdsWrapper(this, videoPlayer,
                (ViewGroup) rootView.findViewById(R.id.adUiContainer));
            sampleAdsWrapper.setFallbackUrl(DEFAULT_STREAM_URL);
    
            final ScrollView scrollView = (ScrollView) findViewById(R.id.logScroll);
            final TextView textView = (TextView) findViewById(R.id.logText);
    
            sampleAdsWrapper.setLogger(new SampleAdsWrapper.Logger() {
                @Override
                public void log(String logMessage) {
                    Log.i(APP_LOG_TAG, logMessage);
                    if (textView != null) {
                        textView.append(logMessage);
                    }
                    if (scrollView != null) {
                        scrollView.post(new Runnable() {
                            @Override
                            public void run() {
                                scrollView.fullScroll(View.FOCUS_DOWN);
                            }
                        });
                    }
                }
            });
    
            playButton = (ImageButton) rootView.findViewById(R.id.playButton);
            // Set up play button listener to play video then hide play button.
            playButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    sampleAdsWrapper.requestAndPlayAds();
                    playButton.setVisibility(View.GONE);
                }
            });
        }
    …
    }
  7. 修改 Activity 的布局文件 activity_my.xml,以添加用于日志记录的界面元素。

    res/layout/activity_my.xml

    …
        <TextView
            android:id="@+id/playerDescription"
            android:text="@string/video_description"
            android:textAlignment="center"
            android:gravity="center_horizontal"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.1"
            android:textSize="@dimen/font_size" />
        <!-- UI element for viewing SDK event log -->
        <ScrollView
            android:id="@+id/logScroll"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.5"
            android:padding="5dp"
            android:background="#DDDDDD">
    
            <TextView
                android:id="@+id/logText"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
            </TextView>
        </ScrollView>
    

恭喜!您正在 Android 应用中请求并展示视频广告。如需微调您的实现,请参阅书签Snapback 指南以及 API 文档

问题排查

如果您在播放视频广告时遇到问题,请尝试下载已完成的基本示例。如果它在 BasicExample 中正常运行,则表示该应用的 IMA 集成代码可能存在问题。 请查看本指南和 API 文档,以检测任何差异。

仍然有问题?请在 IMA SDK 论坛上留言。