如何通过蓝牙连接两个设备按参数发送配对代码？ JAVA，Android的

Question

I'm trying to connect via bluetooth two devices. I've been able to do it, but when the connections starts the OS ask me to provide the pairing code.

What I want to do is give that code programatically. Is there a way to connect those devices and send that pairing code without asking the user to insert it?

Note: I do have the pairing code, I just don't want the user to insert it, instead the app will take it from where it is saved and use it.

Note_2: The pairing code must be used. So, connecting with createInsecureRfcommSocketToServiceRecord() or something like it that does not use the Pairing Code is not an option.

Answer 1

Calling by reflection the hidden method "setPin(byte[])" was the solution.I share the code.

private void PairDevice(BluetoothDevice pDevice, String pin)
{
    try
    {   
        Log.d("pairDevice()", "Start Pairing...");

        Method pairMethod = pDevice.getClass().getMethod("setPin", byte[].class);
        Boolean lReturn = (Boolean) pairMethod.invoke(pDevice, pin.getBytes("UTF8"));

        if(lReturn.booleanValue())
        {
            Log.d("pairDevice()", "Pairing Finished...");

            Method bondMethod = pDevice.getClass().getMethod("createBond");
            bondMethod.invoke(pDevice);
        }               
    }
    catch(Exception ex)
    {
        Log.e("pairDevice()", ex.getMessage());
    }
}   

Also, this answer with more details. Android bluetooth setpin function

Answer 2

I think this link will help you find what you need.

I was thinking more of the "Pairing is automatically performed when you initiate an encrypted connection with the Bluetooth APIs." part of the link. I haven't tried it but was thinking that pairing automatically means no user input.