Volley를 이용한 간단한 네트워크 통신

Volley를 이용하여 간단한 HTTP 통신을 하는 예제이다.

1. AndroidManifest.xml 에서 권한 명시 

<uses-permission android:name="android.permission.INTERNET" />

2. build.gradle 내  dependencies 에 Volley 사용을 위한 명시

compile 'com.android.volley:volley:1.1.0'

3. Build - Make Project 를 하여 프로젝트에서 Volley 사용 가능

4. HTTP 통신 예제

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.util.Log.i
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
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    lateinit var request: RequestQueue
    lateinit var stringRequest: StringRequest

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Setup RequestQueue
        request = Volley.newRequestQueue(this)
        val url = "http://www.google.com"

        // Setup StringRequest
        stringRequest = StringRequest(Request.Method.GET, url, Response.Listener<String> {
            response -> textView1.text = response // Print http source using textview
        }, Response.ErrorListener {
            error ->  i(applicationContext.packageName, error.toString()) // Print log if error occurred
        })

        // Set tag for cancel
        stringRequest.tag = applicationContext.packageName
        // Request
        request.add(stringRequest)
    }

    override fun onStop() {
        super.onStop()

        // Cancel all request that have packageName tag
        if(request != null) {
            request.cancelAll(applicationContext.packageName)
        }
    }
}

GitHub : https://github.com/Hot6ix/SimpleHttpRequest

출처 : https://developer.android.com/training/volley/simple.html