I get the folliwng error- “NullReferenceException: Object reference not set to an instance of an object”,
and it refers me to the following line in my code-
" if (!Touchscreen.current.primaryTouch.press.isPressed) ".
Update-
If I erase those line, the error occures again, and it refers me to the next line that includes “Touchscreen”.
The game works fine.
Any advice?
Thanks!
Aviv
Paste in your complete script and we’ll take a look.
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.InputSystem;
public class BallHandler : MonoBehaviour
{
[SerializeField] private GameObject ballPrefab;
[SerializeField] private Rigidbody2D pivot;
[SerializeField] private float detachDelay;
[SerializeField] private float respawenDelay;
private Camera mainCamera;
private Rigidbody2D currentBallRB;
private SpringJoint2D currentBallSpringJoint;
private bool isDragging;
void Start()
{
mainCamera=Camera.main;
SpawnNewBall();
}
void Update()
{
if (currentBallRB==null) {return;}
if (!Touchscreen.current.primaryTouch.press.isPressed)
{
if (isDragging)
{
LaunchBall();
}
isDragging=false;
return;
}
Vector2 touchPosition=Touchscreen.current.primaryTouch.position.ReadValue();
Vector3 wordposition = mainCamera.ScreenToWorldPoint(touchPosition);
currentBallRB.position= wordposition;
isDragging=true;
currentBallRB.isKinematic=true;
}
private void LaunchBall()
{
currentBallRB.isKinematic=false;
currentBallRB=null;
Invoke(nameof(DetachBall),detachDelay);
}
private void DetachBall()
{
currentBallSpringJoint.enabled= false;
currentBallSpringJoint= null;
Invoke(nameof(SpawnNewBall),respawenDelay);
}
private void SpawnNewBall()
{
GameObject ballInstance = Instantiate(ballPrefab, pivot.position, Quaternion.identity);
currentBallRB=ballInstance.GetComponent<Rigidbody2D>();
currentBallSpringJoint= ballInstance.GetComponent<SpringJoint2D>();
currentBallSpringJoint.connectedBody=pivot;
}
}The code looks correct. Have you enabled Simulate Touch Input From Mouse or Pen in the Input Debugger? (Window/Analysis/InputDebugger) TouchScreen will be null if this is not done.
Yes, it’s enabled.
Is there any other place in which I can see if the thouchscreen is null?
Solved! (but not satisfied)
The error occurs only when I am in game mode. I does not occur when I’m in the simulator.
Thank you Brian!
Aviv
Lol, that happens to me all the time, I get frustrated when the game doesn’t work in the game view, and then finally realize that I need to be in the simulator 
.
Just remember when doing these types of touch inputs like in the course, you can’t use the game view to test, only the simulator
The simulation of the touch screen, enabling TouchScreen is specifically in the Simulator, not the Game window. It simply doesn’t exist in the Game window. That’s a Unity issue.
