How to implement volleyresponse listener using Kotlin - kotlin

Question

I am trying to move my volley requests into a class, so I can use it for multiple network calls. I need a way to access the response listener in whatever activity I use in this class. i saw some examples in java, But I am finding it difficult to do achieve this.
import android.content.Context
import com.android.volley.DefaultRetryPolicy
import com.android.volley.Request
import com.android.volley.RequestQueue
import com.android.volley.Response
import com.android.volley.toolbox.StringRequest
import com.android.volley.toolbox.Volley
interface VolleyResponse{
}
class NetworkCall(LINK:String,
CONTEXT:Context,
CACHE:Boolean,
PARAMS: HashMap<String, String> = HashMap(),
SuccessListener: Response.Listener<String>,
ErrorListener: Response.ErrorListener ) {
private var link:String = LINK
private var context: Context = CONTEXT
var cache: Boolean = CACHE
var PARAMS: HashMap<String,String> = HashMap()
fun RunTask( ){
//BUILD the request and listen for error or success
var request = object : StringRequest(
Request.Method.POST,link,
Response.Listener { response -> { }
},
Response.ErrorListener { error -> { }
}) {
override fun getParams(): HashMap<String, String> {
return PARAMS
}
}
var RequestQueue: RequestQueue = Volley.newRequestQueue(context)
request.setShouldCache(cache)
request.setRetryPolicy(DefaultRetryPolicy(10000, 0, 0F))
}
}
and i call it like this...
fun processLogin() {
var params:HashMap<String,String> = HashMap()
params.put("user_email","username")
params.put("user_password","password")
var networkCall = NetworkCall("",applicationContext,false,params)
}
I just need to be able to access the response listeners in my processLogin function.

Answer 1

First you have to define implementations of Response.Listener<String> and Response.ErrorListener in the class where processLogin is defined, this can be done as following
private val successListener = Response.Listener<String> {
// Do something when response is received
}
private val errorListener = Response.ErrorListener {
// Do something when error is received
}
now pass these as parameters when you call processLogin as following
var networkCall = NetworkCall("",applicationContext,false,params, successListener, errorListener)
Finally you need to update your NetworkCall class so that these listeners are called on network action
fun RunTask( ){
//BUILD the request and listen for error or success
var request = object : StringRequest(
Request.Method.POST,link,
SuccessListener, // Pass listeners to request
ErrorListener) {
override fun getParams(): HashMap<String, String> {
return PARAMS
}
}