从android中的蓝牙设备读取数据

Question

我正在使用蓝牙聊天来连接和接收来自蓝牙设备的数据.

我使用以下代码来读取数据:

public void run() {
    byte[] buffer = new byte[1024];
    int bytes;
    Log.v("MR", "start listening....");

    // Keep listening to the InputStream while connected
    while (true) {
        try {
            // Read from the InputStream
            Log.d("MR", "buffer in try");

            bytes = mmInStream.read(buffer);
            Log.d("MR", "input stream :"+(new String(buffer)));
            // Send the obtained bytes to the UI Activity
            mHandler.obtainMessage(Conn.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
            Log.d("MR", "buffer after");

        } catch (Exception e) {
            Log.e("MR", "Error :"+e.getMessage());
            //
            connectionLost();
           // break;
        }

        Log.d("MR", "buffer after while");
    }
}

设备始终在不停止的情况下发送数据.

使用上面的代码我得到的信息是:

Log.d("MR", "buffer in try");

然后它进入下一行:

bytes=mmInStream.read(buffer);

并且永远不会从那个电话回来.我想这是因为它开始从设备读取数据,并且在断开连接之前不会停止.我怎样才能一次读取一定数量的字节？

编辑

除非它bytes = mmInStream.read(buffer);因代码而停留在代码中; 否则从设备上获取任何数据？

Answer 1

我使用DataInputStreams,因为你可以做一个readFully()方法,它等待在返回之前读取一定数量的字节.我像这样设置BT连接:

BluetoothDevice btDevice = bta.getRemoteDevice(macAddress);
BluetoothSocket btSocket = InsecureBluetooth.createRfcommSocketToServiceRecord(
                    btDevice, UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"), false);

btSocket.connect();
InputStream input = btSocket.getInputStream();
DataInputStream dinput = new DataInputStream(input);

后来当我想阅读时我使用readFully:

dinput.readFully(byteArray, 0, byteArray.length);