Check device access permissions [iOS and Android]

@sajoga

An answer covering iOS.

https://forum.unity3d.com/threads/request-and-get-state-of-camera-permission.281858/

The final post in that thread tells you how to get the iOS permission state. Works, I've tried it. It only deals specifically with the camera, but would be easy to modify for the other states you wanted.

I don't know how to re-ask for permission, I just put up a dialog box telling them they will have to go to settings and give permission manually.

Not yet found a way of detecting on Android yet.

For iOS I used the methods mentioned in the Unity docs here: https://docs.unity3d.com/ScriptReference/Application.RequestUserAuthorization.html

For Android also the methods from the docs: https://docs.unity3d.com/Manual/android-RequestingPermissions.html

I also needed to handle when permission was not granted. Here is my class (I need camera permission before I want to activate Vuforia Engine):

 using UnityEngine;
 using Vuforia;
 #if UNITY_ANDROID
 using UnityEngine.Android;
 #elif UNITY_IOS
 using UnityEngine.iOS;
 #endif
 
 public class CameraPermission : MonoBehaviour
 {
     public GameObject permissionUIparent;
     public GameObject explanationUI;
     public GameObject noAccessUI;
 
     bool isVuforiaInitializing = false;
     VuforiaBehaviour vuforiaBehaviour;
 
     void Awake()
     {
         vuforiaBehaviour = GameObject.Find("AR Camera").GetComponent<VuforiaBehaviour>();
     }
 
     void Start()
     {
         permissionUIparent.SetActive(true);
         explanationUI.SetActive(true);
         noAccessUI.SetActive(false);
     }
 
     void OnGUI()
     {
 #if PLATFORM_ANDROID
         if (!Permission.HasUserAuthorizedPermission(Permission.Camera))
         {
             // permission denied, no access should be visible, when activated when requested permission
             return;
         }
 #elif UNITY_IOS
         if (!Application.HasUserAuthorization(UserAuthorization.WebCam))
         {
             // permission denied, no access should be visible, when activated when requested permission
             return;
         }
 #endif
         // camera permission granted
 
         permissionUIparent.SetActive(false);
 
         if (!isVuforiaInitializing)
         {
             isVuforiaInitializing = true;
             ActivateVuforiaEngine();
         }
     }
 
     public void ActivateVuforiaEngine()
     {
         vuforiaBehaviour.enabled = true;
         VuforiaRuntime.Instance.InitVuforia();
     }
 
     public bool IsCameraPermissionGranted()
     {
 #if UNITY_ANDROID
         return Permission.HasUserAuthorizedPermission(Permission.Camera);
 #elif UNITY_IOS
         return Application.HasUserAuthorization(UserAuthorization.WebCam);
 #endif
     }
 
     public void RequestCameraPermission()
     {
         noAccessUI.SetActive(true); // so it will be visible if user doesn't give permission
 #if PLATFORM_ANDROID
         if (!Permission.HasUserAuthorizedPermission(Permission.Camera))
         {
             Permission.RequestUserPermission(Permission.Camera);
         }
 #elif UNITY_IOS
         if (!Application.HasUserAuthorization(UserAuthorization.WebCam))
         {
             Application.RequestUserAuthorization(UserAuthorization.WebCam);
         }
 #endif
     }
 
     public void ClickedNoAccessGranted()
     {
         noAccessUI.SetActive(true);
     }
 }

Here is the Android Solution:

https://docs.unity3d.com/Manual/android-RequestingPermissions.html