APIChoocher.kt

// @see https://www.avespeak.com/index.php?title=Choocher
object APIChoocher {
    const val BASE_URL = "https://jsonplaceholder.typicode.com"

    suspend fun posts(): JSONObject = request("api/posts")
    suspend fun post(id: String): JSONObject = request("api/posts/$id")
    suspend fun postCreate(title: String, body: String, userId: Int): JSONObject =
            request("api/posts", Request.Method.POST, JSONObject(mapOf("title" to title, "body" to body, "userId" to userId)))

    /**
     * e.g. call it in your Application.onCreate() passing `applicationContext`
     */
    fun initialize(context: Context) {
        mQueue = Volley.newRequestQueue(context)
        mQueue.start()
    }

    private lateinit var mQueue: RequestQueue

    private suspend fun request(path: String, method: Int = Request.Method.GET, body: JSONObject? = null): JSONObject = suspendCoroutine { cont ->
        mQueue.add(JsonObjectRequest(method, "$BASE_URL/$path", body,
                Response.Listener { response -> cont.resume(response) },
                Response.ErrorListener { error -> cont.resumeWithException(error) }))
    }
}