Volley是 Google 推出的 Android 异步网络请求框架和图片加载框架。
Volley的特性
(1).封装了的异步的请求API。Volley 中大多是基于接口的设计，可配置性强。
(2).一个优雅和稳健的请求队列，一定程度符合 Http 规范，包括请求头的处理，缓存机制的支持等。
(3).自定义的网络图像加载视图（NetworkImageView，ImageLoader等) 。
(4). 提供简便的图片加载工具。
本案例包含get，post请求和几种网络图片加载的方式，效果如图：
代码：
辅助类ApplicationController.java
/**
*
*
* 使用请求队列
* Volley的所有请求都放在一个队列，然后进行处理，这里是你如何将创建一个请求队列
* @author Administrator
*
*/
public class ApplicationController extends Application {
public static RequestQueue queue;
@Override
public void onCreate() {
super.onCreate();
queue = Volley.newRequestQueue(getApplicationContext());//使用全局上下文
}
public static RequestQueue getHttpQueue() {
return queue;
}
}
网络请求：
/****
*
* Volley之网络请求
*
* 包含两种 get 和 post 请求方式
*
* @author Administrator
*
*/
public class VolleyRequest extends Activity implements OnClickListener {
private RequestQueue mQueue;
TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_http);
mQueue = ApplicationController.queue;// Volley.newRequestQueue(this);
VolleyUtil.initialize(VolleyRequest.this);
initView();
}
private void initView() {
// TODO Auto-generated method stub
findViewById(R.id.get).setOnClickListener(this);
findViewById(R.id.post).setOnClickListener(this);
findViewById(R.id.get1).setOnClickListener(this);
findViewById(R.id.post1).setOnClickListener(this);
mTextView = (TextView) findViewById(R.id.textView1);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.get:
get();
break;
case R.id.get1:
get1();
break;
case R.id.post:
post();
break;
case R.id.post1:
post1();
break;
default:
break;
}
}
private void get() {
// 列如
String url = "https://www.baidu.com";
mQueue.add(new StringRequest(Method.GET, url, new Listener<String>() {
@Override
public void onResponse(String arg0) {
mTextView
.setText("------------------------------------get1----------------------------------------- \n\n"
+ arg0);
}
}, new ErrorListener() {
@Override
public void onErrorResponse(VolleyError arg0) {
Toast.makeText(VolleyRequest.this, "Get请求失败", 2).show();
}
}));
}
private void get1() {
String url = "https://www.baidu.com";
StringRequest request = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
mTextView
.setText("------------------------------------get2----------------------------------------- \n\n"
+ s);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(VolleyRequest.this, "Get请求失败", 2).show();
}
});
// 设置取消取消http请求标签 Activity的生命周期中的onStiop()中调用
request.setTag("volleyget");
ApplicationController.getHttpQueue().add(request);
}
public void post() {
RequestQueue requestQueue = Volley.newRequestQueue(VolleyRequest.this);
StringRequest stringRequest = new StringRequest(Request.Method.POST,
"https://route.showapi.com/32-9",
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
mTextView
.setText("------------------------------------post1----------------------------------------- \n\n"
+ response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(VolleyRequest.this, "请求失败", 2).show();
}
}) {
@Override
protected Map<String, String> getParams() {
// 在这里设置需要post的参数
return showMap();
}
};
requestQueue.add(stringRequest);
}
public void post1() {
RequestQueue requestQueue = ApplicationController.getHttpQueue();
Request<JSONObject> request = new NormalPostRequest(
"https://route.showapi.com/32-9",
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
mTextView
.setText("------------------------------------post2--------------------------------------- \n\n"
+ response.toString());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(VolleyRequest.this, "请求失败", 2).show();
}
}, showMap());
requestQueue.add(request);
}
/***
*
* 接口POST参数
*
* @return Map
*/
private Map<String, String> showMap() {
Map<String, String> map = new HashMap<String, String>();
map.put("q", "test");
map.put("showapi_appid", "11548");
map.put("showapi_timestamp", "20160511115654");
map.put("showapi_sign", "bb1d15ab7ce646ec87cc89d684ca4bcb");
return map;
}
@Override
protected void onStop() {
super.onStop();
ApplicationController.getHttpQueue().cancelAll("volleyget"); // 结束Activity时队列里面注销
mQueue.cancelAll(this); //取消这个队列里的所有请求：
}
}
图片加载：
/****
*
* Volley之图片加载
*
* @author Administrator
*
*/
public class VolleyImg extends Activity implements OnClickListener {
ImageView imageview1,imageview2;
NetworkImageView mNetworkImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_img);
initView();
}
private void initView() {
// TODO Auto-generated method stub
findViewById(R.id.btn1).setOnClickListener(this);
findViewById(R.id.btn2).setOnClickListener(this);
findViewById(R.id.btn3).setOnClickListener(this);
imageview1 = (ImageView) findViewById(R.id.img1);
imageview2 = (ImageView) findViewById(R.id.img2);
mNetworkImageView = (NetworkImageView) findViewById(R.id.networkImageView);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn1:
img1();
break;
case R.id.btn2:
img2();
break;
case R.id.btn3:
img3();
break;
default:
break;
}
}
private void img1() {
ImageRequest request = new ImageRequest("http://img.my.csdn.net/uploads/201407/26/1406383299_1976.jpg",
new Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap bitmap) {
imageview1.setImageBitmap(bitmap);
}
}, 0, 0, Config.RGB_565,
new Response.ErrorListener() {
public void onErrorResponse(VolleyError error) {
imageview1.setImageResource(R.drawable.ic_launcher);
}
});
VolleySingleton.getVolleySingleton(this.getApplicationContext()).addToRequestQueue(request);
}
public void img2() {
com.android.volley.toolbox.ImageLoader mImageLoader;
mImageLoader = VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
//IMAGE_URL是图片网络地址
//mImageView是ImageView实例
//R.drawable.def_image默认图片id
//R.drawable.err_image加载图片错误时的图片
mImageLoader.get("http://hiphotos.baidu.com/baidu/pic/item/63d0f703918fa0ec2ebf584b269759ee3d6ddb7f.jpg",
com.android.volley.toolbox.ImageLoader.getImageListener(imageview2,R.drawable.ic_launcher, R.drawable.ic_launcher));
}
/**
* 使用NetworkImageView加载图片
*/
public void img3()
{
com.android.volley.toolbox.ImageLoader mImageLoader;
mImageLoader = VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
mNetworkImageView.setImageUrl("http://hiphotos.baidu.com/baidu/pic/item/f603918fa0ec08fabf7a641659ee3d6d55fbda0d.jpg", mImageLoader);
}
}
记得AndroidManifest.xml中加
<uses-permissionandroid:name="android.permission.INTERNET"/> <uses-permissionandroid:name="android.permission.ACCESS_NETWORK_STATE"/> <application android:name="util.ApplicationController">
由于代码太多，布局文件未给出，要源码直接下载即可