Java Android bluetooth IOException:读取失败，套接字可能已关闭或超时，读取ret:-1

我在Android蓝牙API中连接客户端套接字时遇到问题。 我已经读过这些帖子了：，还有 根据这些帖子，我编写了如下代码，但仍然不起作用：

class MainActivity : AppCompatActivity()
{
    private val bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
    private var connectThread: ConnectThread? = null

    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        if (bluetoothAdapter != null)
        {
            if (!bluetoothAdapter.isEnabled)
                bluetoothAdapter.enable()

            val devices = bluetoothAdapter.bondedDevices.toTypedArray()


            if (devices.isNotEmpty())
            {
                connectThread = ConnectThread(devices[0])
                connectThread!!.run()
            }
        }
        else
            Log.i("BluetoothTest", "No bluetooth supported")
    }

    override fun onDestroy()
    {
        super.onDestroy()

        connectThread!!.cancel()
    }

    private inner class ConnectThread(device: BluetoothDevice) : Thread()
    {
        //private val socket = device.createRfcommSocketToServiceRecord(UUID.fromString ("00001101-0000-1000-8000-00805F9B34FB"))
        private val socket = device.javaClass.getMethod("createRfcommSocket", (Int::class
            .javaPrimitiveType)).invoke(device, 2) as BluetoothSocket

        override fun run()
        {
            bluetoothAdapter.cancelDiscovery()
            socket.connect()
        }

        fun cancel()
        {
            socket.close()
        }

    }
}

以下是socket.connect（）上返回的错误日志：

问题似乎出现在Android 4.3之后，因为套接字的端口值 我使用的是安卓7.1和8.1

---

有人知道如何在Android上使用蓝牙吗？

最后，根本原因是无法读取套接字的输入流。这是因为服务器端没有具有相同UUID的开放套接字

看

因此，为了解决这个问题，我们需要一个在另一端具有相同UUID的侦听套接字，对我来说，它是python中的一个覆盆子：

from bluetooth import *

server_sock=BluetoothSocket( RFCOMM )
server_sock.bind(("",PORT_ANY))
server_sock.listen(1)

port = server_sock.getsockname()[1]

uuid = "YOUR UUID"

advertise_service( server_sock, "SampleServer", service_id = uuid, service_classes = [ uuid, SERIAL_PORT_CLASS ], profiles = [ SERIAL_PORT_PROFILE ])

print("Waiting for connection on RFCOMM channel %d" % port)

client_sock, client_info = server_sock.accept()
print("Accepted connection from ", client_info)

try:
    while True:
        data = client_sock.recv(1024)
        if len(data) == 0: break
        print("received [%s]" % data)
except IOError:
    pass

print("disconnected")

client_sock.close()
server_sock.close()
print("all done")

从

from bluetooth import *

server_sock=BluetoothSocket( RFCOMM )
server_sock.bind(("",PORT_ANY))
server_sock.listen(1)

port = server_sock.getsockname()[1]

uuid = "YOUR UUID"

advertise_service( server_sock, "SampleServer", service_id = uuid, service_classes = [ uuid, SERIAL_PORT_CLASS ], profiles = [ SERIAL_PORT_PROFILE ])

print("Waiting for connection on RFCOMM channel %d" % port)

client_sock, client_info = server_sock.accept()
print("Accepted connection from ", client_info)

try:
    while True:
        data = client_sock.recv(1024)
        if len(data) == 0: break
        print("received [%s]" % data)
except IOError:
    pass

print("disconnected")

client_sock.close()
server_sock.close()
print("all done")