How to pair Bluetooth device programmatically Android

Question

I am developing an application where I want to connect a Bluetooth device main issue is I don\'t want user to enter required pin instead application should do that by himsel

Answer 1

    BluetoothSocket bluetoothSocket = null;
    try {
        bluetoothSocket = device.createRfcommSocketToServiceRecord(UUID.fromString(UUID_DIVING));
    } catch (IOException e) {
        Log.i("Bluetooth", "IOException = " + e.getMessage());
        e.printStackTrace();
    }

    try {
        byte[] pin = (byte[]) BluetoothDevice.class.getMethod("convertPinToBytes", String.class).invoke(BluetoothDevice.class, "0000");
        Method m = device.getClass().getMethod("setPin", byte[].class);
        m.invoke(device, (Object) pin);
        device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);
    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
        Log.i("Bluetooth", "IOException = " + e.getMessage());
        e.printStackTrace();
    }

    try {
        if (bluetoothSocket != null) {
            bluetoothSocket.connect();
            Log.i("Bluetooth", "bluetoothSocket.connect() ");
            InputStream inputStream = bluetoothSocket.getInputStream();
            OutputStream outputStream = bluetoothSocket.getOutputStream();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }