fix: check for Camera Permissions first before calling the AR View

This is to prevent a bug where on the first time opening the AR view we wouldn't have Camera permissions (because they were asked for at the same time as we opened the AR view)

src/android/com/outsystems/plugins/arexample/ARPlugin.kt

@@ -1,16 +1,23 @@
 package com.outsystems.plugins.arexample
 
+import android.Manifest
 import android.content.Intent
 import com.google.ar.core.examples.java.helloar.ArTradeActivity
+import com.google.ar.core.examples.java.helloar.CameraPermissionHelper
 import org.apache.cordova.CallbackContext
 import org.apache.cordova.CordovaInterface
 import org.apache.cordova.CordovaWebView
+import org.apache.cordova.PermissionHelper
 import org.json.JSONArray
 
 class ARPlugin: CordovaImplementation(){
 
     override var callbackContext: CallbackContext? = null
 
+    var folderName = ""
+
+    val ACCESS_CAMERA = 0
+
     override fun initialize(cordova: CordovaInterface, webView: CordovaWebView) {
         super.initialize(cordova, webView)
     }
@@ -35,23 +42,42 @@ class ARPlugin: CordovaImplementation(){
     }
 
     private fun doOpenAR(args: JSONArray) {
-        //TODO
 
-        val intent = Intent(cordova.activity, ArTradeActivity::class.java)
-
-        val folderName = args.getString(0)
+        folderName = args.getString(0)
 
         if(folderName.isNullOrEmpty()){
             return
             //later we can return an error here
         }
 
-        intent.putExtra("obj_path", "www/$folderName/mesh.obj")
-        intent.putExtra("texture_path", "www/$folderName/diffuse.png")
-
-        cordova.activity.startActivityForResult(intent, 1)
+        PermissionHelper.requestPermission(this, ACCESS_CAMERA, Manifest.permission.CAMERA);
     }
 
+    override fun onRequestPermissionResult(
+        requestCode: Int,
+        permissions: Array<out String>?,
+        grantResults: IntArray?
+    ) {
+        super.onRequestPermissionResult(requestCode, permissions, grantResults)
+
+
+        if(requestCode == ACCESS_CAMERA){
+
+            if (!CameraPermissionHelper.hasCameraPermission(cordova.activity)) {
+                //if permission wasn't granted, end
+                return
+            }
+            else{
+                val intent = Intent(cordova.activity, ArTradeActivity::class.java)
+
+                intent.putExtra("obj_path", "www/$folderName/mesh.obj")
+                intent.putExtra("texture_path", "www/$folderName/diffuse.png")
+
+                cordova.activity.startActivityForResult(intent, 1)
+            }
+
+        }
+    }
 }