java-如何在设备进入睡眠状态时保持ChromeCast会话的活动状态？

概述我有一个可以将本地媒体内容流式传输到Chromecast接收器的应用.除在设备处于睡眠状态且未使用外部电源时,会话将在约5分钟后终止(从屏幕黑屏起算),这将大部分工作.我已经在这里查看了这个问题：HowdoIkeepaChromeCastroutealivewhenmyappisinthebackgroundonbatter

我有一个可以将本地媒体内容流式传输到Chromecast接收器的应用.除在设备处于睡眠状态且未使用外部电源时,会话将在约5分钟后终止(从屏幕黑屏起算),这将大部分工作.

我已经在这里查看了这个问题：

How do I keep a ChromeCast route alive when my app is in the background on battery power?

…并实施了两个建议的答案.

具体来说,在我的应用清单中,我有：

<uses-permission androID:name="androID.permission.WAKE_LOCK" />

然后,在用于将媒体内容流式传输到Chromecast接收器的嵌入式http服务器中,我正在做：

PowerManager powerManager = (PowerManager)Environment.getApplicationContext().getSystemService(Context.POWER_SERVICE);wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "cast-server-cpu");wakeLock.acquire();WifiManager wifiManager = (WifiManager)Environment.getApplicationContext().getSystemService(Context.WIFI_SERVICE);wifiLock = wifiManager.createWifiLock(WifiManager.WIFI_MODE_FulL_HIGH_PERF, "cast-server-net");wifiLock.acquire();

该代码在服务器线程启动时执行(在选择Chromecast路由时发生),并且直到服务器停止才释放锁.这发生在我的MediaRouter.Callback实现中,该实现(包含上面问题的可接受答案)如下所示：

this.mediaRouterCallback = new MediaRouter.Callback() {    private MediaRouter.RouteInfo autoconnectRoute = null;    @OverrIDe    public voID onRouteSelected(MediaRouter mediaRouter, MediaRouter.RouteInfo routeInfo) {        if (autoconnectRoute == null) {            if (isPlaying()) {                stop();                playbutton.setimageResource(R.drawable.icon_play);            }            castDevice = CastDevice.getFromBundle(routeInfo.getExtras());            if (castServer != null) {                castServer.stop();            }            //start the Chromecast file server            castServer = new CasthttpfileServer();            new Thread(castServer).start();        }        initCastClIEntListener();        initRemoteMediaPlayer();        launchReceiver();    }    @OverrIDe    public voID onRouteUnselected(MediaRouter mediaRouter, MediaRouter.RouteInfo routeInfo) {        if (! doesRouterContainRoute(mediaRouter, routeInfo)) {            //XXX:  do not disconnect in this case (the unselect was not initiated by a user action); see https://stackoverflow.com/questions/18967879/how-do-i-keep-a-Chromecast-route-alive-when-my-app-is-in-the-background-on-batte            autoconnectRoute = routeInfo;            return;        }        //user disconnected, teardown and stop playback        if (isPlaying()) {            stop();            playbutton.setimageResource(R.drawable.icon_play);        }        if (castServer != null) {            castServer.stop();            castServer = null;        }        teardown();        castDevice = null;    }    @OverrIDe    public voID onRouteAdded(MediaRouter router, MediaRouter.RouteInfo route) {        super.onRouteAdded(router, route);        if (autoconnectRoute != null && route.getID().equals(autoconnectRoute.getID())) {            this.onRouteSelected(router, route);        }    }    private boolean doesRouterContainRoute(MediaRouter router, MediaRouter.RouteInfo route) {        if (router == null || route == null) {            return false;        }        for (MediaRouter.RouteInfo info : router.getRoutes()) {            if (info.getID().equals(route.getID())) {                return true;            }        }        return false;    }};

当设备处于睡眠状态且未连接外部电源时,为了使Chromecast会话保持活动状态,还需要做些什么？

此外,考虑到该问题仅在设备未连接USB时才会重现,因此在这种情况下进行调试的有效方法是什么？

编辑

这是会话终止时(从嵌入式http服务器)报告的堆栈跟踪：

java.net.socketException: Software caused connection abort at java.net.socketoutputStream.socketWrite0(Native Method) at java.net.socketoutputStream.socketWrite(SocketoutputStream.java:112) at java.net.socketoutputStream.write(SocketoutputStream.java:157) at com.myapp.CasthttpfileServer.writeResponse(CasthttpfileServer.java:124) at com.myapp.CasthttpfileServer.run(CasthttpfileServer.java:180)

而且我还注意到,我可以在RemoteMediaPlayer.OnStatusUpdatedListener实现中捕获此事件,例如：

if (lastStatus == MediaStatus.PLAYER_STATE_PLAYING && mediaStatus.getPlayerState() == MediaStatus.PLAYER_STATE_BUFFERING) {    //buffer underrun/receiver went away because the wifi dIEd; how do we fix this?}

解决方法:

CommonsWare在他的评论中对此保留权利.闲置约5分钟后,我正在运行AndroID 7.1.2和Doze mode was causing the network to drop的设备上进行测试,而与我的应用程序持有的唤醒锁无关.

解决方法是在清单中添加以下权限：

<uses-permission androID:name="androID.permission.REQUEST_IGnorE_BATTERY_OPTIMIZATIONS" />

然后更新我的onRouteSelected()回调实现,以请求/如果选择了ChromeCast路由,则请禁用“打ze”模式：

if (Build.VERSION.SDK_INT >= 23) {    String packagename = context.getPackagename();    PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);    if (! pm.isIgnoringBatteryOptimizations(packagename)) {        //reguest that Doze mode be Disabled        Intent intent = new Intent();        intent.setAction(            Settings.ACTION_REQUEST_IGnorE_BATTERY_OPTIMIZATIONS);        intent.setData(Uri.parse("package:" + packagename));        context.startActivity(intent);    }}

只要用户在提示时选择“是”,就将遵守该应用的唤醒锁,即使设备未充电,ChromeCast会话仍保持活动状态.

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