okhttpの使い方

http://qiita.com/ryugoo/items/478ba23cda0f57bd21e8

package com.test.okhttptest;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import java.io.IOException;
import butterknife.ButterKnife;
import butterknife.OnClick;


public class MainActivity extends Activity {

    @OnClick(R.id.button)
    public void getRequest(final Button button) {
        button.setEnabled(false);

        new AsyncTask<Void, Void, String>() {
            @Override
            protected String doInBackground(Void... params) {
                String result = null;

                Request request = new Request.Builder()
                        .url("http://google.com")
                        .get()
                        .build();

                OkHttpClient client = new OkHttpClient();

                try {
                    Response response = client.newCall(request).execute();
                    result = response.body().string();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                return result;
            }

            @Override
            protected void onPostExecute(String result) {
                Log.d("TAG", result);
                button.setEnabled(true);
            }
        }.execute();
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.inject(this);
    }

}