"ArcGISRuntimeException: Cannot call this method in this context":when calling createDefaultParametersAsync() for online RouteTask

Question

We are using ARCGIS Android SDK 100.5

We try to fetch the token using rest api

https://www.arcgis.com/sharing/rest/oauth2/token

and create UserCredentials object using token and referrer (unfortunately referrer cannot be nil in Android unlike IOS).

We are assigning the credentials to an online RouteTask

val routeTask = RouteTask(appContext, "http://route.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World")
 val credential = UserCredential.createFromToken(accessToken, "www.arcgis.com")
 routeTask.credential = credential

We are getting exception :

"ArcGISRuntimeException: Cannot call this method in this context" whenever we try to get route parameters from routeTask.

for this method

val routeParameters = routeTask?.createDefaultParametersAsync()?.get()

Please note that we are following similar approach in IOS and it is working fine.

Any hints or suggestion on why this exception is coming?

appdev · Answer

Hi RAMESH BACHIRAJU‌.

I am having the same exact problem as you:
com.esri.arcgisruntime.io.JsonEmbeddedException: Unable to generate token.
Error Code: 22

I am sure the token is fine because i post the URL in a browser like http://layer_url/0?token=my_token and i see the layer information on the browser.

Did you get any solution for this? I would appreciate any help.

Thanks in advance.

RAMESHBACHIRAJU · Answer

We would like to use client-id and client-secret which are not supported by OAuthConfiguration in Android ArcGIS SDK and ArcGIS IOS SDK but are supported in .NET SDK and Rest Api.

Only way we can achieve this is by using RestApi to get the token and assign the token through UserCredential class and assign this credential object to RouteTask

However this is not working, LoadAsync throws an Error.

Any suggestions on how to manage this?

MarkBaird · Answer

My hardcoded user credentials in the above code sample were just to show the done loading pattern, as I explained this is not recommended in a real app.

You shouldn't need to use the rest API directly to use oAuth.  Have you seen this samples code: Authenticate with OAuth | ArcGIS for Developers ?

Code is on git arcgis-runtime-samples-android/java/authenticate-with-oauth at master · Esri/arcgis-runtime-samples-android · GitHub

ChallengeHandlers are what we use for this.  You can use the DefaultChallengeHander as in the example linked above, or you could write your own.