Android Back (or Escape) button isn't being recognized.

Questions & Answers
1

Hello!

I’ve already searched a lot around the internet, but still with the problem. So, what i want to do is: I’m on a video gallery screen (it’s a app not a game) and I want that when I press the Android “Back” button, it returns these functions CloseScreen(); and OpenScreen(); so that will close the video gallery screen and open the main menu screen. I already have a close button to do this, and it is working, but i want the Android “Back” button working too.

Here it is my code:

	void Update(){
		if (Input.GetKey(KeyCode.Escape)){
			CloseScreen ();
			OpenScreen ();
			Debug.Log ("Pressed Back button");
		}
	}

	public void OpenScreen(){
		screenToBeOpened.SetActive (true);
	}
	public void CloseScreen(){
		screenToBeClosed.SetActive (false);
	}
}
4

I finally solved the problem.

1st thing: the android back button is totally buged using unity 5 remote with Galaxy tab 3 (I don’t know with other devices), it just worked when I built the project.

2nd thing: It just worked with a brand new project, and I used other code to do the open/close functions.

3rd thing: I’ll show the scripts.

using UnityEngine;
using System.Collections;

public class openCloseAB : MonoBehaviour {

	public Transform canvas;
	public GameObject openThis;

	void Update () {
		if (Input.GetKeyDown(KeyCode.Escape)){
			if (canvas.gameObject.activeInHierarchy == false) { //If the "canvas" is deactivated on the hierarchy.
				canvas.gameObject.SetActive (true); // It activates the "canvas" when I press Escape button.
			} 
			else{
				canvas.gameObject.SetActive (false); //It deactivates the "canvas" when I press Escape button.
				openit (); //When I deactivate the "canvas" it opens the previous gameObject (other canvas).
			}
		}
	}

	private void openit(){
		openThis.gameObject.SetActive (true);
	}
}

This script is used for the android back button.

The other one:

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class openClose : MonoBehaviour {

	public GameObject screenToBeOpened, screenToBeClosed;

	public void OpenScreen(){	//This function opens a canvas.
		screenToBeOpened.SetActive (true);
	}
	public void CloseScreen(){	//This function closes the previous canvas to optimize the app.
		screenToBeClosed.SetActive (false);
	}
}

And this one is used to activate and deactivate the canvases, with the buttons functions too.

I’m sorry if it’s a little bit confusing by the way…
Well, thanks for the help of everyone @sohail_786 @Bonfire-Boy @SaurabhStudio !!!

2

void Update()
{
if (Input.GetKey(KeyCode.Escape))
{
// code
}
}

Code is perfect , Do you get debug?

Have you drag that scripts to any gameobject?

If yes , then that gameobject is active or not? Please check that.

3

@username
use Input.GetKeyDown (KeyCode.Escape) instead if (Input.GetKey(KeyCode.Escape))
and call it in update or make a couroutine with yield return new WaitForEndOfFrame ();