Android - Multiple Touch Inputs

Unity Engine
1

So I am trying to make a local multiplayer android game and I’m a bit confused here

This is my code now for player 1’s button (Player 2 is the same)

 public tank1 tank1t;
   
    void OnMouseDown()
    {
       
        tank1t.ifRotate = false;
        tank1t.Fire();
    }

    void OnMouseUp()
    {
      
      
       
        if (tank1t.rotatingDirection == 1)
        {
            tank1t.rotatingDirection = 2;
        }
        else if (tank1t.rotatingDirection == 2)
        {
            tank1t.rotatingDirection = 1;
        }
        tank1t.stopmov();
        tank1t.ifRotate = true;
       
    }

But player 1 and player 2 buttons cant be clicked at the same time
and I have no idea how to make it work the way I want to
I need that Touch Down/Touch up and I have no idea how to handle that with multiple touches.
If anyone can help me that would be amazing.

2

One approach people seem to use for multi touch buttons is EventTriggers:

I think the input does allow for multi touch - but it takes some custom settings to get it to work proper - for instance enabling multitouch through code (Input.MultiTouchEnabled = true; ) and some stuff.

And I think if you carefully manually handle touches with GetTouch you can also do multi touch setups:

EDIT: one more thing to consider - last I checked unity remote does not accept multi touch properly, and you’ll need to test a build on the actual device rather than using remote!

1 Like
3

You’ll need to look into touch input (there are checks for touch which you would look for in Update) and not use the buttons as buttons.

I honestly haven’t tried this, but this would be my guess as I don’t believe the MouseDown and MouseUp can handle multiple touches properly.

Example would be getting a touch from the array of touches Unity - Scripting API: Input.GetTouch and then checking for when that touch ends and seeing if it entered and exited a gui element.

2 Likes
4

So i came up with this code:

public Text text;

    // Update is called once per frame
    void Update () {
        if(Input.touchCount > 0)
        {
            for (int i = 0; i < Input.touchCount; i++)
            {
                Vector2 touchpos = Input.touches[i].position;
                if(touchpos.y >= 400 && touchpos.x <= 450)
                {
                    text.text = touchpos.ToString();
                }
            }
            /*
            Touch touch = Input.GetTouch(0);
            Debug.Log(touch.position);
            text.text = touch.position.ToString();
            */
        }
      
    }

But the problem is that on every device the Y/X is different
Is that the right way to do this?

5

That is a tricky situation when it comes to scaling for all screens. There isn’t an ideal solution I’ve discovered - but you could depend on checking Screen.height and Screen.width to determine what scale you should be checking at. An alternative way might be to check with raycasts when a touch is down, and if it lands on a button, consider that a hit, here is an example of that kind of stuff:
https://stackoverflow.com/questions/49321922/unity-raycast-ui-button-and-call-its-on-click-event

That might not have working code - I haven’t personally tested, but google around for stuff similar to that, and see if you can hack something together.

6

Thank you!
But is it possible to use stuff such as OnTouchUp/OntTouchDown With this?

(Btw sry my English is really bad :confused: )

7

I’m actually not totally sure if there is way - but if so, google may know the answer :stuck_out_tongue:

There might be some way to setup delegates to call those methods when a certain raycast hits that button - but it would be a bit overkill, as you can already tell the button is being hit when the raycast detects it - so you probably wouldn’t need it to do that anymore. I hope that makes sense :smile:

8

Yeah it does make sense xd
But now i have this code:

 private float screenHeight;
    private float screenWidth;

    public tank1 tank1t;
    public tank2 tank2t;

    private void Start()
    {
        screenHeight = Screen.currentResolution.height;
        screenWidth = Screen.currentResolution.width;

        screenHeight = screenHeight / 2;
        screenWidth = screenWidth / 2;

    }
   
    
    void Update () {
        if(Input.touchCount > 0)
        {
            for (int i = 0; i < Input.touchCount; i++)
            {
                Vector2 touchpos = Input.touches[i].position;
                Touch touch = Input.touches[i];
                if (touchpos.y >= screenHeight && touchpos.x <= screenWidth)
                {
                   
                  
                    switch (touch.phase)
                    {
                        // Record initial touch position.
                        case TouchPhase.Began:
                            tank1t.ifRotate = false;
                            tank1t.Fire();
                            break;

                       
                        //case TouchPhase.Moved:
                          //  break;

                       
                        case TouchPhase.Ended:
                            if (tank1t.rotatingDirection == 1)
                            {
                                tank1t.rotatingDirection = 2;
                            }
                            else if (tank1t.rotatingDirection == 2)
                            {
                                tank1t.rotatingDirection = 1;
                            }
                            tank1t.stopmov();
                            tank1t.ifRotate = true;
                            break;
                    }
                }
            }
           
          
           
        }
      
    }

It all works fine but when I don’t release the touch and move to the side
It doesn’t really do anything till I touch again
I understand why this is happening but i have no idea how to fix it :frowning: