snippets Kotlin

gistfile1.kt

// ------- HOW DEFINE A SINGLETON FOR VOLLEY REQUEST -------
// original source in Java: https://developer.android.com/training/volley/requestqueue.html
object MySingleton {

    val TAG:String = "MySingleton"
    var mRequestQueue:RequestQueue? = null

    init {
        Log.d(TAG, "init")
    }

    fun getRequestQueue(context:Context):RequestQueue? {
        Log.d(TAG, "getRequestQueue")

        if(mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(context)
        }

        return mRequestQueue
    }

    fun <T> addToRequestQueue(req:Request<T>){
        mRequestQueue?.add(req)
    }
}

// ------- MAKE VOLLEY REQUEST WITH SINGLETON -------
val url:String = "https://ringsdb.com/api/public/card/01002"

val jsonObjectRequest: JsonObjectRequest= JsonObjectRequest(Request.Method.GET, url, null,
    Response.Listener {
        response:JSONObject -> Log.d(TAG, response.toString())
    },
    Response.ErrorListener {
        error:VolleyError -> Log.e(TAG, error.message)
    }
)

MySingleton.getRequestQueue(this)

MySingleton.addToRequestQueue(jsonObjectRequest)

//----- START NEW ACTIVITY WITH INTENT ------
var intent:Intent = Intent(applicationContext, OtherActivity::class.java)
startActivity(intent)