APK Expansion Files / Obb 接入介绍

APK Expansion Files 是谷歌官方提供的APK分包下载策略, 依赖工程已经包含在SDK中.

官方资料

• 文档

使用方法

1. 导入依赖工程

依赖工程放在SDK文件夹中/SDK/extras/google/文件夹下, 需要依赖market_apk_expansion与market_licensing.

说明1: market_apk_expansion对market_licensing有依赖

说明2: 如果出现Android App crashes on Lollipop - Service Intent must be explicit: [duplicate]类似的报错, 请参照链接修改工程代码licensing工程BUG

2. 打包OBB文件

• 官方文档-使用JOBB打包OBB文件

3. 客户端接入

OBB是通过谷歌后台public key与包名进行资源匹配, 请确保这两项正确.

1. 继承service, receiver

   • 继承 BroadcastReceiver

     
     用于在游戏运行的时候检查是否需要下载资源文件, 重写`onReceive(Context, Intent)`方法, 示例@Overridepublic void onReceive(Context context, Intent intent) {try {DownloaderClientMarshaller.startDownloadServiceIfRequired(context,intent, SampleDownloaderService.class);} catch (PackageManager.NameNotFoundException e) {e.printStackTrace();}}

   • 继承DownloaderService

     新建一个class, 继承`DownloaderService`, 重写了里面的三个方法, * `getPublicKey()`, 需要在return中返回游戏的`public key`.
     * `getSALT()`, 需要在return中返回SALT需要返回一个随机字节数组, 格式如下public static final byte[] SALT = new byte[] { 1, 42, -12, -1, 54, 98, -100, -12, 43, 2, -8, -4, 9, 5, -106, -107, -33, 45, -1, 84};
     * `getAlarmReceiverClassName()`返回之前继承`BroadcastReceiver`的className, 示例@Overridepublic String getAlarmReceiverClassName() {return SampleAlarmReceiver.class.getName();}

2. AndroidManifest.xml相关配置

   声明权限:

       <!-- Required to access Google Play Licensing --><uses-permission android:name="com.android.vending.CHECK_LICENSE" /><!-- Required to download files from Google Play --><uses-permission android:name="android.permission.INTERNET" /><!-- Required to keep CPU alive while downloading files(NOT to keep screen awake) --><uses-permission android:name="android.permission.WAKE_LOCK" /><!-- Required to poll the state of the network connectionand respond to changes --><uses-permissionandroid:name="android.permission.ACCESS_NETWORK_STATE" /><!-- Required to check whether Wi-Fi is enabled --><uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/><!-- Required to read and write the expansion files on shared storage --><uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE" />声明service, receiver:<service android:name=".SampleDownloaderService" /><receiver android:name=".SampleAlarmReceiver" />
   

   1. 下载Activity的配置

      • onCreate中添加初始化代码

        示例
        @Override

protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);try{Intent notifierIntent = new Intent(this, MainActivity.class);notifierIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_CLEAR_TOP);PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,notifierIntent, PendingIntent.FLAG_UPDATE_CURRENT);// 如果需要, 开始下载serviceint startResult =DownloaderClientMarshaller.startDownloadServiceIfRequired(this,pendingIntent, SampleDownloaderService.class);if (startResult != DownloaderClientMarshaller.NO_DOWNLOAD_REQUIRED) {// 开始下载mDownloaderClientStub = DownloaderClientMarshaller.CreateStub(this,SampleDownloaderService.class);return;}}catch(Throwable e) {e.printStackTrace();}}* 接入接口Activity中implements`IDownloaderClient`.* `onServiceConnected()`当service连接的时候会调用此方法, 请添加如下逻辑, 获得service对象mRemoteService = DownloaderServiceMarshaller.CreateProxy(m);mRemoteService.onClientUpdated(mDownloaderClientStub.getMessenger());* `onDownloadStateChanged()`下载状态发生变化的时候, 会调用此方法* `onDownloadProgress()`下载进度进行中会不断调用此方法, 用于更新下载的状态* service其他API* `requestPauseDownload()`暂停下载* `requestContinueDownload()`继续下载* `setDownloadFlags()`下载标识设置. 目前只提供一个标识, `IDownloaderService.FLAGS_DOWNLOAD_OVER_CELLULAR`, 如果设置, 玩家可以通过移动网络下载, 否则只能在WIFI状态进行下载