如何在Android中配对（绑定）蓝牙设备后以编程方式连接到该设备

Question

我一直在努力让键盘或遥控器等蓝牙设备连接到Android设备。更具体地说，当这个程序第一次运行时，它会扫描蓝牙设备，并尝试与找到的设备配对和连接。我尝试了所有可能的方法来实现这一点，但我只能配对设备，而不能完全连接。我已经在Android Bluetooth guide和其他许多手册中尝试了这些例子。一个一致性是javi。BluetoothSocket调用connect时发生io错误。

java.io.IOException: read failed, socket might closed or timeout, read ret: -1
at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:505)
at android.bluetooth.BluetoothSocket.waitSocketSignal(BluetoothSocket.java:482)
at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:324)
at BTConnectThread.run(BTConnectThread.java:61)

我尝试了不同的UUID。有些是我自己生成的，有些是我从设备中提取的。我还尝试编写代码，假设两者都充当服务器，主要反映我在这里所做的事情以及Android蓝牙指南中的内容。已经尝试了在设备上调用createBond（）的所有变体。所有尝试都使设备配对/绑定但未连接。非常感谢任何帮助。'html" target="_blank">public BTConnectThread（BluetoothDevice BluetoothDevice）{

    BluetoothSocket tempSocket = null;

    try {
       // tempSocket =        bluetoothDevice.createRfcommSocketToServiceRecord(WELL_KNOWN_UUID);
      //  tempSocket = bluetoothDevice.createInsecureRfcommSocketToServiceRecord(WELL_KNOWN_UUID);

        //Magic?
        Method method = bluetoothDevice.getClass().getMethod("createRfcommSocket",
            new Class[]{int.class});
        tempSocket = (BluetoothSocket) method.invoke(bluetoothDevice, 1);

    } catch (Exception e) {
        e.printStackTrace();
    }

    m_bluetoothSocket = tempSocket;

}

public void run() {

    //cancel discovery
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (bluetoothAdapter != null)
        bluetoothAdapter.cancelDiscovery();

    //TODO: Try brute force approach. Loop until it connects.
    //TODO: Try a fallback socket.
    try {
        m_bluetoothSocket.connect();
        Log.d(TAG, "Connection Established");

    } catch (IOException connectException) {
        // Unable to connect; close the socket and get out
        Log.d(TAG, "Fail to connect!", connectException);
        try {
            m_bluetoothSocket.close();
        } catch (IOException closeException) {
            Log.d(TAG, "Fail to close connection", closeException);
        }
        return;
    }
}

public void cancel() {

    try {
        m_bluetoothSocket.close();
    } catch (IOException e) {

    }
}`

Answer 1

连接函数

    fun connect(btDevice: BluetoothDevice?){
        val id: UUID = btDevice?.uuids?.get(0)!!.uuid
        val bts = btDevice.createRfcommSocketToServiceRecord(id)
        bts?.connect()
    }

在主线程中调用此

    val bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
    val device = bluetoothAdapter.getRemoteDevice("your mac address")
    connect(device)

Answer 2

蓝牙连接需要创建3个以上的线程，因此您可以尝试使用https://android-arsenal.com/details/1/1859.