一、首先下载Jar包

https://github.com/square/okhttp

如果使用android studio只需要加入依赖compile 'com.squareup.okhttp3:okhttp:3.2.0'

二、下载一张图片并显示
使用的是hanlder的方式

package com.liunan.okhttpdemo2;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageView;import android.widget.Toast;import java.io.IOException;import java.io.InputStream;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;import okhttp3.ResponseBody;public class MainActivity extends AppCompatActivity { private static final int ERROR = 1; private static final int SUCCESS = 2 ; private String url = "http://192.168.1.102:8080/img/a.jpg"; private ImageView mIv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { switch (msg.what){ case SUCCESS: mIv.setImageBitmap((Bitmap) msg.obj); break; case ERROR: Toast.makeText(MainActivity.this, "请求超时", Toast.LENGTH_SHORT).show(); break; } } }; /** * 初始化 组件 */ private void initView() { mIv = (ImageView) findViewById(R.id.main_iv); } /** * 点击获取图片 */ public void getPic(View v){ new Thread(){ @Override public void run() { //获取okHttp对象get请求, try { OkHttpClient client = new OkHttpClient(); //获取请求对象 Request request = new Request.Builder().url(url).build(); //获取响应体 ResponseBody body = client.newCall(request).execute().body(); //获取流 InputStream in = body.byteStream(); //转化为bitmap Bitmap bitmap = BitmapFactory.decodeStream(in); //使用Hanlder发送消息 Message msg = Message.obtain(); msg.what = SUCCESS; msg.obj = bitmap; handler.sendMessage(msg); } catch (IOException e) { e.printStackTrace(); //失败 Message msg = Message.obtain(); msg.what = ERROR; handler.sendMessage(msg); } } }.start(); }}

也可以把网络请求写为一个工具类,

package com.liunan.okhttpdemo2;import java.io.IOException;import java.io.InputStream;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;/** * Created by 刘楠 on 2016-03-27. */public class OkHttpUtils { OkHttpClient client = new OkHttpClient(); /** * 获取流 * @param url 请求地址 * @return 输入流 */ public InputStream getInpuStream(String url) throws IOException { //设置 请求 Request request = new Request.Builder() .url(url).build(); //获取行响应 InputStream in = client.newCall(request).execute().body().byteStream(); return in; } /** * 返回字符串 * @param url * @return 返回字符串 * @throws IOException */ public String getString(String url) throws IOException { //设置 请求 Request request = new Request.Builder() .url(url).build(); //获取行响应 Response response = client.newCall(request).execute(); return response.body().string(); }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。