Can you get Unity to ignore the second touch?

Questions & Answers
1

I have a script that makes an object move towards the mouse/finger position. When I play this on Android, I can freely drag the object around but whenever I use a second finger the object moves to the center point between both fingers.

I was wondering if there was a way to get Unity to disregard the second finger entirely and only allow one finger on the screen at a time?

2

You can tell how many touches are detected in a given frame by checking the Input.touchCount property. So, you could just wrap your “move” code with something like;

if (Input.touchCount == 1) 
{
    // Only 1 touch active here, so do 1-touch motion...
}
3

For handling a single touch; this will help:

void Update ()
{

    // ... some other code ....

    if (Input.touchCount > 0)
	{
		switch (Input.GetTouch(0).phase) {
		case TouchPhase.Began:
			// code to run when touch begins here...
			break;
		case TouchPhase.Moved:
		case TouchPhase.Stationary:
			// code to run when touch is being dragged here...
			break;
		case TouchPhase.Ended:
			// code to run when touch is lifted up and finished here...
			break;
		case TouchPhase.Canceled:
			// code to run when touch is interrupted and does not get to run the 'Ended' case here... (jumps from dragging to being canceled by some interruption like a phone call)
			break;
		}
	}

    // ... Some other code ...

} // end Update

if you want to handle multiple touches, just change the IF to a FOR loop [ for (int i = 0; i < Input.touchCount; i++) ] and instead of directly using getTouch(0) use getTouch (i).

Hope its useful.