android - Android中的SendBird.addChannelHandler在实现接收消息时不起作用

Question

以下代码是用 onResume 编写的，正在实现 SendBird API 的接收消息功能

protected void onResume()
{
super.onResume();
Log.d("----->", "in on resume");
SendBird.addChannelHandler("ABCD" , new SendBird.ChannelHandler()
{
@Override
public void onMessageReceived(BaseChannel baseChannel, BaseMessage 
baseMessage)
{
Log.d("----->","onMessageReceived");
if (baseMessage instanceof UserMessage)
{
// message is a UserMessage
UserMessage userMessage = (UserMessage) baseMessage;
String msg = userMessage.getMessage();
alMsgs.add(msg);
adapter.notifyDataSetChanged();
Log.d("---->",msg);
}
else if (baseMessage instanceof FileMessage)
{
// message is a FileMessage
}
}
@Override
public void onChannelDeleted(String channelUrl, 
BaseChannel.ChannelType channelType)
{
super.onChannelDeleted(channelUrl, channelType);
Log.d("---->","on channel deleted");
}
});
}

我在 Android 监视器中没有得到任何日志输出，除了说“在恢复中”的那个。