Google Cast Android Sender：未调用 ResultCallback

Question

我正在学习适用于 Android 的 Google Cast Sender 应用程序教程，但在连接到 Cast CustomReceiver 时遇到了困难。

我使用以下ConnectionCallbacks 实现：

private class ConnectionCallbacks implements GoogleApiClient.ConnectionCallbacks {
    @Override
    public void onConnected(Bundle bundle) {
        Log.i(TAG, "ConnectionCallbacks.onConnected");

        LaunchOptions options = new LaunchOptions.Builder()
                .setRelaunchIfRunning(false)
                .build();
        Cast.CastApi
                .launchApplication(mApiClient, getString(R.string.google_cast_key), options)
                .setResultCallback(new ResultCallback<Cast.ApplicationConnectionResult>() {
                    @Override
                    public void onResult(Cast.ApplicationConnectionResult result) {
                        Status status = result.getStatus();
                        if (status.isSuccess()) {
                            Log.i(TAG, "Success!!! " + result.getApplicationStatus());
                        } else {
                            Log.e(TAG, "No success!!! " + result.getApplicationStatus());
                        }
                    }
                });
    }

    @Override
    public void onConnectionSuspended(int i) {
        Log.i(TAG, "ConnectionCallbacks.onConnectionSuspended: " + i);
    }
}

还有 CustomReceiver 代码：

<script>

  window.castReceiverManager = cast.receiver.CastReceiverManager.getInstance();

  var appConfig = new cast.receiver.CastReceiverManager.Config();

  appConfig.statusText = 'Ready to play';

  // 100 minutes for testing, use default 10sec in prod by not setting this value
  appConfig.maxInactivity = 6000;

  window.castReceiverManager.start();
  console.log('Starting Receiver Manager');
  document.getElementById("message").innerHTML='Starting Receiver Manager';
</script>

当我从对话框中选择我的 chromecast 时，我的自定义接收器应用程序会在 chromecast 上启动并且应用程序日志

11-05 22:38:00.470: I/MainActivity(8955): ConnectionCallbacks.onConnected

但是，它从不调用ResultCallback 或ConnectionFailedListener 的onResult 或onConnectionSuspended。我错过了什么？

添加的日志文件

 [  0.340s] [cast.receiver.CastReceiverManager] Dispatching CastReceiverManager system ready event
desorona_cast_receiver.html:45 Received Ready event: {"id":"E9198EB3","name":"DESORONA","sessionId":"93EB8C53-4589-4D49-B578-E46D289B57F9","namespaces":[],"launchingSenderId":"40:com.example.test-145"}
cast_receiver.js:40  [  0.353s] [cast.receiver.IpcChannel] IPC message sent: {"namespace":"urn:x-cast:com.google.cast.system","senderId":"SystemSender","data":"{\"type\":\"setappstate\",\"statusText\":\"Application status is ready...\"}"}
cast_receiver.js:40  [  0.373s] [cast.receiver.IpcChannel] Received message: {"data":"{\"level\":1.0,\"muted\":false,\"type\":\"volumechanged\"}","namespace":"urn:x-cast:com.google.cast.system","senderId":"SystemSender"}
cast_receiver.js:40  [  0.375s] [cast.receiver.CastMessageBus] Dispatching CastMessageBus message
cast_receiver.js:40  [  0.378s] [cast.receiver.CastReceiverManager] Dispatching system volume changed event [1, false]
cast_receiver.js:40  [  0.382s] [cast.receiver.IpcChannel] Received message: {"data":"{\"type\":\"visibilitychanged\",\"visible\":true}","namespace":"urn:x-cast:com.google.cast.system","senderId":"SystemSender"}
cast_receiver.js:40  [  0.385s] [cast.receiver.CastMessageBus] Dispatching CastMessageBus message
cast_receiver.js:40  [  0.388s] [cast.receiver.CastReceiverManager] Dispatching visibility changed event true
cast_receiver.js:40  [  0.392s] [cast.receiver.IpcChannel] Received message: {"data":"{\"standby\":false,\"type\":\"standbychanged\"}","namespace":"urn:x-cast:com.google.cast.system","senderId":"SystemSender"}
cast_receiver.js:40  [  0.393s] [cast.receiver.CastMessageBus] Dispatching CastMessageBus message
cast_receiver.js:40  [  0.395s] [cast.receiver.CastReceiverManager] Dispatching standby changed event false

Answer 1

我解决了我的问题。不是发送者，而是接收者。 Google 没有声明，在使用 CustomReceivers 时需要注册 MessageBus。使 Sender 连接到 Receiver 的最小 ReceiverCode 必须是：

  var namespace = 'urn:x-cast:com.denis_loh.desorona'

  window.onload = function() {
    cast.receiver.logger.setLevelValue(0);
    window.castReceiverManager = cast.receiver.CastReceiverManager.getInstance();       

    // Erstelle MessageBus zum Austauschen von Daten
    window.messageBus = window.castReceiverManager.getCastMessageBus(namespace);

    // Lege onMessage-Callback für den MessageBus fest.
    window.messageBus.onMessage = onMessage;

    // Starte den Receiver.
    window.castReceiverManager.start({statusText: "Application is starting"});
    console.log('Receiver Manager started');
  };

  function onMessage(event) {
    window.messageBus.send(event.senderId, event.data);
  }

但是，我还不知道为什么需要这样做。