处理程序后执行队列顺序不正确

时间：2019-01-30 15:40:20

标签： android bluetooth-lowenergy threadpool handler

我正在与蓝牙BLE设备（使用针对我们产品开发的自定义协议）进行通信的android应用程序上工作。

连接到设备后，我有回叫public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) 每次设备要向我发送数据时都会触发。 在应用程序体系结构中，我们有操作（例如getDeviceStatus()），该协议按以下方式工作：电话连接到设备->进行握手->发送命令（以字节为单位）->设备以命令响应（正常/不正常） ）->现在设备开始发送X byte[]块。 因此，请确保我们以正确的顺序处理数据，并且不会因我添加了HandlerThread的不同线程而陷入混乱：

HandlerThread handlerThread = new HandlerThread("ActionHandlerThread");
      handlerThread.start();
      Looper looper = handlerThread.getLooper();
      mHandler = new Handler(looper);

每次设备发送数据时我都会呼叫

@Override
 public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
    mHandler.post(() -> {
        mListener.onCharacteristicChanged(gatt, characteristic);
        }
    );  
 }

和mListener将数据发送给其他类，这些类检查到达的数据类型和期望的数据。 如果我每次调用post（）都理解正确，则将新任务添加到处理程序的循环程序中，并应按照与添加它们相同的顺序处理该任务，但是当我在日志中运行该应用程序时，我看到回调已正确触发并发布了）以正确的顺序调用，但随后的处理顺序错误。 例如，应用程序希望接收到确认命令，但是数据已经来了，但这是不可能的，因为数据不能在确认之前来。 我创建HandlerThread的主要原因是确保使用BLE的整个操作将在单个线程上运行，并且不必担心同步问题，但是现在看来我确实存在同步问题。 我是否错过一些逻辑或对HandlerThread的理解。

我仅使用计时器和计数器进行的一些测试，我们可以看到，当间隔短至1 ms时，并非所有任务都打印在帖子中：

5毫秒的间隔：

2019-01-30 21:33:31.531 27991-27991/? D/ThreadTest: Thread before Thread[main,5,main]
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间隔1毫秒：

2019-01-30 21:32:57.104 27831-27831/? D/ThreadTest: Thread before Thread[main,5,main]
2019-01-30 21:32:57.105 27831-27866/? D/ThreadTest: Counter : 1 , Thread[Timer-0,5,main]
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2019-01-30 21:32:57.152 27831-27865/? D/ThreadTest: Counter : 40 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.153 27831-27866/? D/ThreadTest: Counter : 41 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.154 27831-27866/? D/ThreadTest: Counter : 42 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.154 27831-27865/? D/ThreadTest: Counter : 42 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.154 27831-27865/? D/ThreadTest: Counter : 42 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.155 27831-27866/? D/ThreadTest: Counter : 43 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.155 27831-27865/? D/ThreadTest: Counter : 43 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.156 27831-27866/? D/ThreadTest: Counter : 44 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.156 27831-27865/? D/ThreadTest: Counter : 44 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.157 27831-27866/? D/ThreadTest: Counter : 45 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.158 27831-27865/? D/ThreadTest: Counter : 45 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.159 27831-27866/? D/ThreadTest: Counter : 46 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.159 27831-27865/? D/ThreadTest: Counter : 46 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.160 27831-27866/? D/ThreadTest: Counter : 47 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.160 27831-27865/? D/ThreadTest: Counter : 47 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.161 27831-27866/? D/ThreadTest: Counter : 48 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.161 27831-27865/? D/ThreadTest: Counter : 48 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.163 27831-27866/? D/ThreadTest: Counter : 49 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.163 27831-27866/? D/ThreadTest: Counter : 50 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.163 27831-27865/? D/ThreadTest: Counter : 50 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.163 27831-27865/? D/ThreadTest: Counter : 50 , inside post Thread[MyTestThread,5,main]

测试代码：

private fun handlerThreadTest() {
    val handlerThread = HandlerThread("MyTestThread")
    handlerThread.start()

    val handler = Handler(handlerThread.looper)

    Log.d("ThreadTest", "Thread before ${Thread.currentThread()}")
    var i = 0
    val timerObj = Timer()
    val timerTaskObj = object : TimerTask() {
      override fun run() {
        i++
        //perform your action here
        Log.d("ThreadTest", "Counter : $i , ${Thread.currentThread()}")
        handler.post {
          Log.d("ThreadTest", "Counter : $i , inside post ${Thread.currentThread()}")
          if (i == 50)
            timerObj.cancel()
        }
      }
    }

    timerObj.schedule(timerTaskObj, 0, 5)

  }

1 个答案:

答案 0 :(得分：1)

您的代码中有错误。在发布Runnable之前，需要从特性中提取值。否则，当Runnable稍后运行并提取值时，它将是最新的。

在Chromium中实施Web蓝牙时犯了同样的错误。参见https://bugs.chromium.org/p/chromium/issues/detail?id=647673&desc=2。

还要注意，在较新的Android版本中，您可以直接在connectGatt中设置处理程序。

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