compile 'com.squareup.okhttp3:okhttp:3.2.0'

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();

    }

}

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();

    }

}