volley 应用 GET POST请求 图片异步加载

 package com.example.volleydemo;

 import java.util.HashMap;
 import java.util.Map;

 import org.json.JSONObject;

 import android.app.Activity;
 import android.app.ProgressDialog;
 import android.graphics.Bitmap;
 import android.os.Bundle;
 import android.support.v4.util.LruCache;
 import android.util.Log;
 import android.widget.ImageView;

 import com.android.volley.Request;
 import com.android.volley.RequestQueue;
 import com.android.volley.Response;
 import com.android.volley.VolleyError;
 import com.android.volley.toolbox.ImageLoader;
 import com.android.volley.toolbox.ImageLoader.ImageCache;
 import com.android.volley.toolbox.ImageLoader.ImageListener;
 import com.android.volley.toolbox.JsonObjectRequest;
 import com.android.volley.toolbox.NetworkImageView;
 import com.android.volley.toolbox.StringRequest;
 import com.android.volley.toolbox.Volley;

 /**
  * Demo描述: 1 利用Volley获取JSON数据  2 利用Volley异步加载图片 1 利用NetworkImageView加载网路图片
  *
  */
 public class MainActivity extends Activity {
     private ImageView mImageView;
     private NetworkImageView mNetworkImageView;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         init();
     }

     private void init() {
         mImageView = (ImageView) findViewById(R.id.imageView);
         mNetworkImageView = (NetworkImageView) findViewById(R.id.networkImageView);
         getJSONByVolley();
         getJsonPost();
         loadImageByVolley();
         showImageByNetworkImageView();
     }

     /**
      * 利用Volley获取JSON数据
      */
     private void getJSONByVolley() {
         RequestQueue requestQueue = Volley.newRequestQueue(this);
         String JSONDataUrl = "http://127.0.0.1:8099/api/api.ashx?action=product_list&ver=1&pageindex=1&pageCount=5";
         final ProgressDialog progressDialog = ProgressDialog.show(this,
                 "请稍后...", "正在加载...");

         JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(
                 Request.Method.GET, JSONDataUrl, null,
                 new Response.Listener<JSONObject>() {
                     @Override
                     public void onResponse(JSONObject response) {
                         //处理返回的JSON数据
                         Log.e("bbb", response.toString());
                         if(progressDialog.isShowing() && progressDialog!=null){
                           progressDialog.dismiss(); }
                     }
                 }, new Response.ErrorListener() {
                     @Override
                     public void onErrorResponse(VolleyError arg0) {
                         // System.out.println("sorry,Error");
                         Log.e("aaa", arg0.toString());
                     }
                 });
         requestQueue.add(jsonObjectRequest);
     }

     /***
      * 以POST形式加载数据
      */
     private void getJsonPost() {
         RequestQueue requestQueue = Volley.newRequestQueue(this);
         String url = "http://127.0.0.1:8099/api/api.ashx";
         StringRequest postRequest = new StringRequest(Request.Method.POST, url,
                 new Response.Listener<String>() {
                     @Override
                     public void onResponse(String response) {
                         //处理返回的JSON数据
                         Log.d("Response", response);
                     }
                 }, new Response.ErrorListener() {
                     @Override
                     public void onErrorResponse(VolleyError error) {
                         // error
                     }
                 }) {
             @Override
             protected Map<String, String> getParams() {
                 //POST 参数
                 Map<String, String> params = new HashMap<String, String>();
                 params.put("action", "product_list");
                 params.put("ver", "1");
                 params.put("pageindex", "1");
                 params.put("pageCount", "5");
                 return params;
             }
         };
         requestQueue.add(postRequest);
     }

     /**
      * 利用Volley异步加载图片
      *
      * 注意方法参数: getImageListener(ImageView view, int defaultImageResId, int
      * errorImageResId) 第一个参数:显示图片的ImageView 第二个参数:默认显示的图片资源 第三个参数:加载错误时显示的图片资源
      */
     private void loadImageByVolley() {
         String imageUrl = "http://d.hiphotos.baidu.com/pic/w%3D310/sign=a00aca825aafa40f3cc6c8dc9b65038c/060828381f30e9246b63e1814c086e061c95f7bf.jpg";
         RequestQueue requestQueue = Volley.newRequestQueue(this);
         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(
                 20);
         ImageCache imageCache = new ImageCache() {
             @Override
             public void putBitmap(String key, Bitmap value) {
                 lruCache.put(key, value);
             }

             @Override
             public Bitmap getBitmap(String key) {
                 return lruCache.get(key);
             }
         };
         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
         ImageListener listener = ImageLoader.getImageListener(mImageView,
                 R.drawable.ic_launcher, R.drawable.ic_launcher);
         imageLoader.get(imageUrl, listener);
     }

     /**
      * 利用NetworkImageView显示网络图片
      */
     private void showImageByNetworkImageView() {
         String imageUrl = "http://d.hiphotos.baidu.com/pic/w%3D310/sign=a00aca825aafa40f3cc6c8dc9b65038c/060828381f30e9246b63e1814c086e061c95f7bf.jpg";
         RequestQueue requestQueue = Volley.newRequestQueue(this);
         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(
                 20);
         ImageCache imageCache = new ImageCache() {
             @Override
             public void putBitmap(String key, Bitmap value) {
                 lruCache.put(key, value);
             }

             @Override
             public Bitmap getBitmap(String key) {
                 return lruCache.get(key);
             }
         };
         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
         mNetworkImageView.setTag("url");
         mNetworkImageView.setImageUrl(imageUrl, imageLoader);
     }

 }

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
      >  

     <com.android.volley.toolbox.NetworkImageView
         android:id="@+id/networkImageView"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_centerHorizontal="true"
         android:layout_marginTop="30dip"
     />  

      <ImageView
         android:id="@+id/imageView"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_centerInParent="true"
     />  

 </RelativeLayout>  

引入Volley非常简单，首先，从git库先克隆一个下来：

git clone https://android.googlesource.com/platform/frameworks/volley

然后生成JAR包 引用

下面是我生成好的JAR

引用volley JAR包 下载地址

结合GSON和fastJson用法

http://www.cnblogs.com/freexiaoyu/p/3955137.html