MainActivity.java

package com.tutosandroidfrance.okhttp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

import com.squareup.okhttp.Callback;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    OkHttpClient okHttpClient;
    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.textView = (TextView) findViewById(R.id.text);

        this.okHttpClient = new OkHttpClient();

        post();
    }

    public void get(){
        //get Request
        Request myGetRequest = new Request.Builder()
                .url("https://api.github.com/users/florent37")
                .build();

        okHttpClient.newCall(myGetRequest).enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {

            }

            @Override
            public void onResponse(Response response) throws IOException {
                //le retour est effectué dans un thread différent
                final String text = response.body().string();
                final int statusCode = response.code();

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        textView.setText(text);
                    }
                });
            }
        });
    }

    public void post(){

        MediaType JSON_TYPE = MediaType.parse("application/json; charset=utf-8");
        String myJson = "{}";

        //post Request
        Request myGetRequest = new Request.Builder()
                .url("https://api.github.com/users/florent37")
                .post(RequestBody.create(JSON_TYPE, myJson))
                .build();

        okHttpClient.newCall(myGetRequest).enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {

            }

            @Override
            public void onResponse(Response response) throws IOException {
                //le retour est effectué dans un thread différent
                final String text = response.body().string();

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        textView.setText(text);
                    }
                });
            }
        });
    }
}