Double touch on mobile, simple way?

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Hi,

i have some issues to understand how we can get a double tap on mobile (android). The code from the complete project of Penelope works fine, but it is more about a "long touch" rather than a double touch. I have tried the code from this thread (http://answers.unity3d.com/questions/167750/how-does-multi-touch-work.html), but it does not work :

     var count = Input.touchCount;
     
     
     /* 1/ DOES NOT WORK:
     var tt : Touch;
     var tcount = tt.tapCount;
     
     if (tcount==1) Debug.Log("______!!!!!!!!!!!!!!!______________");
     else if (tcount==2) animation.CrossFade("newAnim");*/
     
     
     
     /* 2/ ONLY SAYS count == 1, never count == 2*/
     if (count!=0){
         
         Debug.Log("________ count EQUALS :::::: _________"+count);
         
         var tapCount = Input.touchCount;
         if(tapCount > 1) {
             animation.CrossFade("newAnim");
         }
         
         for(var i : int = 0;i < count; i++)
         {
             if (i==0) Debug.Log("________ i EQUALS ZERO_________");//always shows this one
             else if (i==1) Debug.Log("________ i EQUALS OOONNNNEEE_________");//never this one
         }
     }

I tried to modify the code from "Penelope", but i guess i have to be very careful with the time elapsed between 2 touches :

 if (count!=0){
         
         for(var i : int = 0;i < count; i++)
         {
             Debug.Log("__ME : _____i : "+i);
             // Adjust the tap time window while it still available
             if ( tapTimeWindow > 0 )
                 tapTimeWindow -= Time.deltaTime;
             else
                 tapCount = 0;
                 
             // Accumulate taps if it is within the time window
             if ( tapTimeWindow > 0 )
                 tapCount++;
             else
             {
                 tapCount = 1;
                 tapTimeWindow = tapTimeDelta;
             }
         }
         
         if (tapCount==2){
             Debug.Log("__ME : _____if tapCount==2 YES");
             animation.CrossFade("newAnim");
         }
         
     
     }

Would anyone know why the first code does not work? And if there is a simple solution to get the double touch, instead of calculating the time between 2 touches?

EDIT:

I have tried this one, but i never get more that "one" touch, so it stays at "GetTouch(0)" even when i double tap on the screen :

 var count = Input.touchCount;
     
     if (count!=0){
         
         for(var i : int = 0;i < count; i++)
         {
             if (Input.GetTouch(i).phase == TouchPhase.Began) Debug.Log("______GetTouch("+i+") !!!______________");
         }
     }

Thanks

Answer 1

Answer by Eric5h5 · Nov 08, 2012 at 06:29 PM

 for (var touch in Input.touches) {
     if (touch.tapCount == 2) {
         // double-tap
     }
 }

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Paul36 · Nov 08, 2012 at 11:07 PM 0

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@Eric5h5 Argh thanks a lot, why my first attempt with the "for loop" did not work? Also, i have read that with this way (var touch in Input.touches) it uses the heap and not only the stack for the memory. Would it be a problem if i use a lot of different touches during my game?

Thanks again Eric!

Eric5h5 · Nov 08, 2012 at 11:57 PM 0

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You could check touchCount and loop through them using Input.GetTouch().

Paul36 · Nov 09, 2012 at 01:36 PM 0

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@Eric5h5 how would you do that? Because `if (Input.GetTouch(1))` does not work, as "it cannot be used in a boolean context", and `Input.touchCount == 1` for example does not trigger the Debug.Log ?

Eric5h5 · Nov 09, 2012 at 02:44 PM 0

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See the code examples in the docs for Input.GetTouch.

Paul36 · Nov 09, 2012 at 03:12 PM 0

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@Eric5h5 do you mean adding a TouchPhase value to the getTouch? i edited my post to show you the code, because it does not work for a double tap, only for one touch

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