Replace float v=Input.GetAxis("Vertical") with touch?

Hey community,

currently I´m working on a mobile Legend of Zelda clone and got the controls on the pc going. But I have trouble porting it to android. Please help!

Now I want to replace the w,a,s,d respectively the arrow keys with 4 virtual guiTexture buttons.

I got this code on the sprite of the main charater:

 public class playerController : MonoBehaviour { 
 
     public float Speed = 2;
     Animator anima;  
 
     void Start () { 
         anima = GetComponent<Animator>();
         Label.SetActive(false);
     } 
 
     void Update () { 
         float v = Input.GetAxis("Vertical"); 
         float h = Input.GetAxis("Horizontal");
         float s = Input.GetAxis("Space");
         ManageMovement(h, v, s);
     } 
 
     void ManageMovement(float horizontal,float vertical,float fight) { 
         if (horizontal != 0f || vertical != 0f) { 
             anima.SetBool ("moving", true); 
             animateWalk (horizontal, vertical);
         } 
         else {
             anima.SetBool ("moving", false);
         }
 
         if (fight != 0f) {
             anima.SetBool ("fighting", true);
             animateFight (horizontal, vertical);
         }
         else {
             anima.SetBool ("fighting", false);
         }
 
         Vector3 movement = new Vector3 (horizontal,vertical, 0); 
         rigidbody2D.velocity = movement * Speed; 
     } 
 
     void animateWalk(float h,float v) { 
         if(anima){ if ((v > 0)&&(v>h)) { 
                 anima.SetInteger ("Direction", 1);
 
             } 
         if ((h > 0)&&(v<h)) { 
                 anima.SetInteger ("Direction", 2); 
             }
         if ((v < 0)&&(v<h)) { 
                 anima.SetInteger ("Direction", 3); 
             } 
         if ((h < 0 )&&(v>h)) { 
                 anima.SetInteger ("Direction", 4); 
             }
         } 
     }
 
     void animateFight(float h,float v) {
         if(anima){ if ((v > 0)&&(v>h)) { 
                 anima.SetInteger ("Direction", 1);
                 
             } 
             if ((h > 0)&&(v<h)) { 
                 anima.SetInteger ("Direction", 2); 
             }
             if ((v < 0)&&(v<h)) { 
                 anima.SetInteger ("Direction", 3); 
             } 
             if ((h < 0 )&&(v>h)) { 
                 anima.SetInteger ("Direction", 4); 
             }
         } 
     }
 } 

Thanks very much for your time, answers and help!