Android

Question

我需要连接到充当服务器的蓝牙设备。我知道它的 UUID（至少设备的文档包含它）。但是，当我尝试连接到它时出现异常。发现部分成功进行。

下面我引用了相关的代码部分

这是发现。成功找到我的设备后，我尝试连接它。

private val bluetoothAdapter: BluetoothAdapter? = BluetoothAdapter.getDefaultAdapter()
private val bluetoothReceiver = object : BroadcastReceiver() {
  override fun onReceive(context: Context, intent: Intent) {
    val action: String = intent.action
    when (action) {
      BluetoothDevice.ACTION_FOUND -> {
        val foundDevice: BluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE)
        Log.i("NAME", foundDevice.name)
        if (foundDevice.name.startsWith("RN487")) {
          bluetoothAdapter?.cancelDiscovery()
          device = foundDevice
          val connectThread = ConnectThread(device)
          connectThread.start()
        }
      }
    }
  }
}
private lateinit var device: BluetoothDevice

ConnectThread class 在这里：

private inner class ConnectThread(device: BluetoothDevice) : Thread() {

  private val mSocket: BluetoothSocket? by lazy(LazyThreadSafetyMode.NONE) {
    device.createRfcommSocketToServiceRecord(UUID)
  }

  override fun run() {
    bluetoothAdapter?.cancelDiscovery()
    mSocket?.use { socket ->
      socket.connect()
      toast("Connected!")
    }
  }

  fun cancel() {
    try {
      mSocket?.close()
    } catch (e: IOException) {
      Log.e(TAG, "Could not close the client socket", e)
    }
  }
}

UUID 被指定为

private val UUID = nameUUIDFromBytes("49535343-...".toByteArray())

感谢您的宝贵时间和专业知识！

Answer 1

正如我一位眼尖的同事指出的那样，蓝牙描述以 "oldschool" version on the official android developers site. Later, the bluetooth low energy 开头，我的项目需要它。

Android - 启动蓝牙套接字 - 连接超时

Android - Initiate Bluetooth Socket - connection timeout

bluetooth

kotlin

bluetooth-socket