CUSTOM DROP DOWN BUTTON FOR ANDROID APPLICATION

Questions & Answers
1

There’s a problem with my project and I am new in coding C#. Everytime I play/run the project on unity, it runs properly but then when I build it on my mobile phone (android), everytime I touch the drop down button, it doesn’t display the buttons under that drop down. Can anyone please help me to solve this? I tried searching solutions on the internet but I cant get the right solution. Thank you so much! Here’s my code:

using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections;

public class Dropdown : MonoBehaviour
{

public RectTransform container;
public bool isOpen;

void Start () 
{
	container = transform.Find ("Container").GetComponent<RectTransform>();

}

void Update () 
{
	if (isOpen) 
	{
		Vector3 scale = container.localScale;
		scale.y = Mathf.Lerp (scale.y, 1, Time.deltaTime * 12);
		container.localScale = scale;
	}

	else
	{
		Vector3 scale = container.localScale;
		scale.y = Mathf.Lerp (scale.y, 0, Time.deltaTime * 12);
		container.localScale = scale;
	}
}

void OnMouseDown()
{
	isOpen = true;
}

void OnMouseUp()
{
	isOpen = false;
}

}

2

OnMouseDown/OnMouseUp are only invoked if using a mouse, so use OnPointerDown/OnPointerUp instead. Implement the interfaces IPointerDownHandler and IPointerUpHandler in order for UnityEvents to call them automatically.

Like:

public class Dropdown : MonoBehaviour, IPointerDownHandler, IPointerUpHandler
{
	public void OnPointerDown(PointerEventData eventData)
	{
		isOpen = true;
	}

	public void OnPointerUp(PointerEventData eventData)
	{
		isOpen = false;
	}
}

Note in order for this to work you need a EventSystem in your scene, but chances are you already have it.

Also note your dropdown will only appear if you hold the button down due to your code.