指定的消息队列同步屏障令牌尚未发布 [英] The specified message queue synchronization barrier token has not been posted

问题描述

我有一个应用程序，它作为一个绑定的服务。我将消息发送到服务，但有时我收到以下错误：

I have an app which as a binded service. I am sending messages to the service, but sometimes I am getting the following error:

E / AndroidRuntime（28216）：java.lang.IllegalStateException：指定的消息队列同步屏障令牌尚未发布或已经被删除

E/AndroidRuntime(28216): java.lang.IllegalStateException: The specified message queue synchronization barrier token has not been posted or has already been removed.

有时候，我得到这个错误，而不是：
 android.util.AndroidRuntimeException：{=什么时888 = 0}此消息已在使用中

Sometimes I get this error instead: android.util.AndroidRuntimeException: { what=888 when=0 } This message is already in use.

有时UI只是冻结。我从服务，通过处理器进行通信的活动，反之亦然。

Sometimes the UI just freezes. I am communicating from the service to the activity and visa versa through handlers.

 public void init(IBinder service){
    playerService = new Messenger(service);
    setBound(true);
    try {
        Message msg = Message.obtain(null, PlayerService.MSG_REGISTER_CLIENT);
        msg.replyTo = messenger;
        playerService.send(msg);
        while(!messageQueue.isEmpty()){
            playerService.send(messageQueue.remove());
        }
    } catch (RemoteException e) {
        // In this case the service has crashed before we could even do anything with it
        Log.d(Player.TAG, "problem binding player messenger " + e.getMessage());
    }
}

下面是consistenly结果上结冰，因此被称为第二次的方法。

Here is a method which consistenly results on freezes, the second time it is called.

public void play(String url) {
    Message msg = Message.obtain(null, PlayerService.PLAY, 0, 0);
    msg.setData(getURLBundle(url));
    sendMessage(msg);
}

private void sendMessage(Message message){
    if(!isBound){
        Log.d(Player.TAG, "isnt bound, queueing message");
        messageQueue.add(message);
    }else {
        try {
            playerService.send(message);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
}

我是新的线程/使者和处理程序，所以任何帮助AP preciated，感谢：）

I'm new to Threading/ Messengers and Handlers, so any help is appreciated, thanks :)

推荐答案

问题是，你队列消息，由message.obtain（）分配。你需要通过调用新的Message（）的copyfrom（消息）来创建邮件的副本，然后在队列中添加复印的消息。

Problem is that you queue messages, that are allocated by message.obtain(). You need to create copy of message by calling new Message(), copyFrom(message) and then add copied message in queue.

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