import com.google.ipc.invalidation.ticl.android2.channel.AndroidChannelConstants.C2dmConstants; //导入依赖的package包/类
/** Sets the token echoed on subsequent HTTP requests. */
static void setEchoToken(Context context, String token) {
  SharedPreferences.Editor editor = getPreferences(context).edit();

  // This might fail, but at worst it just means we lose an echo token; the channel
  // needs to be able to handle that anyway since it can never assume an echo token
  // makes it to the client (since the channel can drop messages).
  editor.putString(C2dmConstants.ECHO_PARAM, token);
  if (!editor.commit()) {
    logger.warning("Failed writing shared preferences for: setEchoToken");
  }
}
 

import com.google.ipc.invalidation.ticl.android2.channel.AndroidChannelConstants.C2dmConstants; //导入依赖的package包/类
/** Sets the token echoed on subsequent HTTP requests. */
static void setEchoToken(Context context, String token) {
  SharedPreferences.Editor editor = getPreferences(context).edit();

  // This might fail, but at worst it just means we lose an echo token; the channel
  // needs to be able to handle that anyway since it can never assume an echo token
  // makes it to the client (since the channel can drop messages).
  editor.putString(C2dmConstants.ECHO_PARAM, token);
  commitEditor(editor, "setEchoToken");
}
 

import com.google.ipc.invalidation.ticl.android2.channel.AndroidChannelConstants.C2dmConstants; //导入依赖的package包/类
@Override
protected void onMessage(Intent intent) {
  // Forward the message to the Ticl service.
  if (intent.hasExtra(C2dmConstants.CONTENT_PARAM)) {
    String content = intent.getStringExtra(C2dmConstants.CONTENT_PARAM);
    byte[] msgBytes = Base64.decode(content, Base64.URL_SAFE);
    try {
      // Look up the name of the Ticl service class from the manifest.
      String serviceClass = new AndroidTiclManifest(this).getTiclServiceClass();
      AddressedAndroidMessage addrMessage = AddressedAndroidMessage.parseFrom(msgBytes);
      Intent msgIntent =
          ProtocolIntents.InternalDowncalls.newServerMessageIntent(addrMessage.getMessage());
      msgIntent.setClassName(this, serviceClass);
      startService(msgIntent);
    } catch (InvalidProtocolBufferException exception) {
      logger.warning("Failed parsing inbound message: %s", exception);
    }
  } else {
    logger.fine("GCM Intent has no message content: %s", intent);
  }

  // Store the echo token.
  String echoToken = intent.getStringExtra(C2dmConstants.ECHO_PARAM);
  if (echoToken != null) {
    AndroidChannelPreferences.setEchoToken(this, echoToken);
  }
}
 

import com.google.ipc.invalidation.ticl.android2.channel.AndroidChannelConstants.C2dmConstants; //导入依赖的package包/类
/** Returns the echo token that should be included on HTTP requests. */

public static String getEchoToken(Context context) {
  return getPreferences(context).getString(C2dmConstants.ECHO_PARAM, null);
}