How can I detect if a gamepad is present?

On PC, you can use Input.GetJoystickNames(), which returns an array of strings of the names of the joysticks that are connected. If that array is empty, there are no pnp joysticks connected, I guess.

I hope that helps!

I'm currently trying to figure out how to tell if there is a Bluetooth joystick connected on an Android device, but that information doesn't seem to be quite as handily available.

you can do this in C#

 private int Xbox_One_Controller = 0;
     private int PS4_Controller = 0;
 void Update()
 {
 string[] names = Input.GetJoystickNames();
         for (int x = 0; x < names.Length; x++)
         {
             print(names[x].Length);
             if (names[x].Length == 19)
             {
                 print("PS4 CONTROLLER IS CONNECTED");
                 PS4_Controller = 1;
                 Xbox_One_Controller = 0;
             }
             if (names[x].Length == 33)
             {
                 print("XBOX ONE CONTROLLER IS CONNECTED");
                 //set a controller bool to true
                 PS4_Controller = 0;
                 Xbox_One_Controller = 1;
 
             }
         }
 
 
 if(Xbox_One_Controller == 1)
 {
 //do something
 }
 else if(PS4_Controller == 1)
 {
 //do something
 }
 else
 {
 // there is no controllers
 }
 }

FYI, on PC I'm finding some GamePads (MOGA for example) stay registered as connected in Windows 10 --- even months later. And generate an Axis value if -1,-1.

Not sure if that helps anyone else. But I'll probably create an exception where until a joysticks value changes for the first time it continues to consider them disabled.