Add the Zoho maven repository URL in app/build.gradle:

Integrate Zoho Creator UI Library & Authentication Library in app/build.gradle.

Add the below string in the strings.xml of your app:

In the oncreate method in your application / activity class, Initialize the Accounts SDK as follows:

IAMClientSDK.getInstance(this).init(scopes)

where scopes - "aaaserver.profile.READ,zohocontacts.userphoto.READ,ZohoContacts.contactapi.READ,
ZohoCreator.meta.CREATE,ZohoCreator.meta.READ,ZohoCreator.meta.UPDATE,
ZohoCreator.meta.DELETE,ZohoCreator.data.CREATE,ZohoCreator.data.READ,
ZohoCreator.data.UPDATE,ZohoCreator.data.DELETE,Stratus.stratusop.READ,
ZohoCRM.modules.READ,ZohoCRM.users.READ"

Create an Activity called HandleRedirectActivity and add the following code to its oncreate method:

IAMClientSDK.getInstance(this).handleRedirection(this)

Add the following code to the AndroidManifest.xml file:

To open the login screen, add the below code snippet:

val sdk = IAMClientSDK.getInstance(applicationContext)
if (!sdk.isUserSignedIn) {
    sdk.presentLoginScreen(this, object : IAMTokenCallback {
        override fun onTokenFetchInitiated() {

        }

        override fun onTokenFetchComplete(zohoToken: IAMToken) {
            //<This method will be called after user logged-in successfully>
        }

        override fun onTokenFetchFailed(zohoErrorCodes: IAMErrorCodes) {
            //<This method will be called if any error occurred in the login. You will receive the error code in this callback.>
        }
    }, null)
} else {
    // start intent to your first activity
}

Implement the Creator Authentication interface ZCOauthHelper in your app as follows:

class ZCAuthImpl(private val context: Context) : ZCOauthHelper {

    @Throws(ZCException::class)
    override suspend fun getAccessToken(): String? {
        return suspendCoroutine { continuation ->
            IAMClientSDK.getInstance(context).getToken(object : IAMTokenCallback {
                override fun onTokenFetchInitiated() {
                }

                override fun onTokenFetchComplete(token: IAMToken) {
                    continuation.resumeWith(Result.success(token.token))
                }

                override fun onTokenFetchFailed(errorCode: IAMErrorCodes) {
                    continuation.resumeWith(Result.success(null))
                }
            })
        }
    }

    override fun getInitialScopes(context: Context): String {
        return ""
    }

    override fun isUserSignedIn(): Boolean {
        return IAMClientSDK.getInstance(context).isUserSignedIn
    }

    override fun getUserData(): Any? {
        return null
    }

    override fun getTransformedUrl(url: String): String {
        return url
    }

    override fun checkAndLogout(): Boolean {
        return false
    }
    override fun isEnhanceTokenNeeded(newScopes: String): Boolean { 
        return false 
    }
    override fun enhanceToken(tokenHelper: ZCOauthHelper.ZCOAuthTokenHelper, newScopes: String) { 
    }
}

Add the below code snippet to your application's / activity's oncreate method to set the instance of Authentication interface to the Creator SDK:

ZCAPIUtil.setOAuthHelper(ZCAuthImpl(applicationContext))

Add the following to your AndroidManifest.xml file, under the application tag: