Android网络请求框架的使用okhttp

        1、在manifest文件中添加网络权限。

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

        2、在module的build.gradle文件中添加依赖库。

compile 'com.squareup.okhttp:okhttp:2.0.0'
compile 'com.squareup.okio:okio:1.5.0'

        3、使用okhttp请求网络字符串。

private void okhttpRequestString () {
//创建OkHttpClient对象
OkHttpClient okHttpClient = new OkHttpClient ();
//定义url字符串。
String url = "https://www.baidu.com";
//构建请求对象
Request request = new Request.Builder ().url (url).build ();
//发送请求。
Call call = okHttpClient.newCall (request);
//设置回调
call.enqueue (new Callback () {
//请求失败
@Override
public void onFailure (Request request, IOException e) {
Log.d ("ysy","request is failure!");
}
//请求成功
@Override
public void onResponse (Response response) throws IOException {
//获取请求到的数据
String string = response.body ().string ();
//发送Handler消息，跟新UI
Message msg = new Message ();
msg.what = MSG_STRING;
msg.obj = string;
mHandler.sendMessage (msg);
}
});
}

       4、使用okhttp从网络上请求一张图片。

private void okhttpRequestImage () {
//创建OkHttpClient对象
OkHttpClient okHttpClient = new OkHttpClient ();
//定义url字符串。
String url = "https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png";
//构建请求对象
Request request = new Request.Builder ().url (url).build ();
//发送请求。
Call call = okHttpClient.newCall (request);
//设置回调
call.enqueue (new Callback () {
//请求失败
@Override
public void onFailure (Request request, IOException e) {
Log.d ("ysy","request image is failure!");
}
//请求成功
@Override
public void onResponse (Response response) throws IOException {
//获取请求到的输入流
InputStream inputStream = response.body ().byteStream ();
//将输入流加载为一个Bitmap对象。
Bitmap bitmap = BitmapFactory.decodeStream (inputStream);
//发送Handler消息，跟新UI
Message msg = new Message ();
msg.what = MSG_IMAGE;
msg.obj = bitmap;
mHandler.sendMessage (msg);
}
});
}