volley 应用 GET POST请求图片异步加载

  1 package com.example.volleydemo;
  2 
  3 import java.util.HashMap;
  4 import java.util.Map;
  5 
  6 import org.json.JSONObject;
  7 
  8 import android.app.Activity;
  9 import android.app.ProgressDialog;
 10 import android.graphics.Bitmap;
 11 import android.os.Bundle;
 12 import android.support.v4.util.LruCache;
 13 import android.util.Log;
 14 import android.widget.ImageView;
 15 
 16 import com.android.volley.Request;
 17 import com.android.volley.RequestQueue;
 18 import com.android.volley.Response;
 19 import com.android.volley.VolleyError;
 20 import com.android.volley.toolbox.ImageLoader;
 21 import com.android.volley.toolbox.ImageLoader.ImageCache;
 22 import com.android.volley.toolbox.ImageLoader.ImageListener;
 23 import com.android.volley.toolbox.JsonObjectRequest;
 24 import com.android.volley.toolbox.NetworkImageView;
 25 import com.android.volley.toolbox.StringRequest;
 26 import com.android.volley.toolbox.Volley;
 27 
 28 /**
 29  * 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
 30  * 
 31  */
 32 public class MainActivity extends Activity {
 33     private ImageView mImageView;
 34     private NetworkImageView mNetworkImageView;
 35 
 36     @Override
 37     protected void onCreate(Bundle savedInstanceState) {
 38         super.onCreate(savedInstanceState);
 39         setContentView(R.layout.activity_main);
 40         init();
 41     }
 42 
 43     private void init() {
 44         mImageView = (ImageView) findViewById(R.id.imageView);
 45         mNetworkImageView = (NetworkImageView) findViewById(R.id.networkImageView);
 46         getJSONByVolley();
 47         getJsonPost();
 48         loadImageByVolley();
 49         showImageByNetworkImageView();
 50     }
 51 
 52     /**
 53      * 利用Volley获取JSON数据
 54      */
 55     private void getJSONByVolley() {
 56         RequestQueue requestQueue = Volley.newRequestQueue(this);
 57         String JSONDataUrl = "http://127.0.0.1:8099/api/api.ashx?action=product_list&ver=1&pageindex=1&pageCount=5";
 58         final ProgressDialog progressDialog = ProgressDialog.show(this,
 59                 "请稍后...", "正在加载...");
 60 
 61         JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(
 62                 Request.Method.GET, JSONDataUrl, null,
 63                 new Response.Listener<JSONObject>() {
 64                     @Override
 65                     public void onResponse(JSONObject response) {
 66                         //处理返回的JSON数据
 67                         Log.e("bbb", response.toString());
 68                         if(progressDialog.isShowing() && progressDialog!=null){ 
 69                           progressDialog.dismiss(); }
 70                     }
 71                 }, new Response.ErrorListener() {
 72                     @Override
 73                     public void onErrorResponse(VolleyError arg0) {
 74                         // System.out.println("sorry,Error");
 75                         Log.e("aaa", arg0.toString());
 76                     }
 77                 });
 78         requestQueue.add(jsonObjectRequest);
 79     }
 80 
 81     /***
 82      * 以POST形式加载数据
 83      */
 84     private void getJsonPost() {
 85         RequestQueue requestQueue = Volley.newRequestQueue(this);
 86         String url = "http://127.0.0.1:8099/api/api.ashx";
 87         StringRequest postRequest = new StringRequest(Request.Method.POST, url,
 88                 new Response.Listener<String>() {
 89                     @Override
 90                     public void onResponse(String response) {
 91                         //处理返回的JSON数据
 92                         Log.d("Response", response);
 93                     }
 94                 }, new Response.ErrorListener() {
 95                     @Override
 96                     public void onErrorResponse(VolleyError error) {
 97                         // error
 98                     }
 99                 }) {
100             @Override
101             protected Map<String, String> getParams() {
102                 //POST 参数
103                 Map<String, String> params = new HashMap<String, String>();
104                 params.put("action", "product_list");
105                 params.put("ver", "1");
106                 params.put("pageindex", "1");
107                 params.put("pageCount", "5");
108                 return params;
109             }
110         };
111         requestQueue.add(postRequest);
112     }
113 
114     /**
115      * 利用Volley异步加载图片
116      * 
117      * 注意方法参数: getImageListener(ImageView view, int defaultImageResId, int
118      * 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
119      */
120     private void loadImageByVolley() {
121         String imageUrl = "http://d.hiphotos.baidu.com/pic/w%3D310/sign=a00aca825aafa40f3cc6c8dc9b65038c/060828381f30e9246b63e1814c086e061c95f7bf.jpg";
122         RequestQueue requestQueue = Volley.newRequestQueue(this);
123         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(
124                 20);
125         ImageCache imageCache = new ImageCache() {
126             @Override
127             public void putBitmap(String key, Bitmap value) {
128                 lruCache.put(key, value);
129             }
130 
131             @Override
132             public Bitmap getBitmap(String key) {
133                 return lruCache.get(key);
134             }
135         };
136         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
137         ImageListener listener = ImageLoader.getImageListener(mImageView,
138                 R.drawable.ic_launcher, R.drawable.ic_launcher);
139         imageLoader.get(imageUrl, listener);
140     }
141 
142     /**
143      * 利用NetworkImageView显示网络图片
144      */
145     private void showImageByNetworkImageView() {
146         String imageUrl = "http://d.hiphotos.baidu.com/pic/w%3D310/sign=a00aca825aafa40f3cc6c8dc9b65038c/060828381f30e9246b63e1814c086e061c95f7bf.jpg";
147         RequestQueue requestQueue = Volley.newRequestQueue(this);
148         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(
149                 20);
150         ImageCache imageCache = new ImageCache() {
151             @Override
152             public void putBitmap(String key, Bitmap value) {
153                 lruCache.put(key, value);
154             }
155 
156             @Override
157             public Bitmap getBitmap(String key) {
158                 return lruCache.get(key);
159             }
160         };
161         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
162         mNetworkImageView.setTag("url");
163         mNetworkImageView.setImageUrl(imageUrl, imageLoader);
164     }
165 
166 }

View Code

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
 2     xmlns:tools="http://schemas.android.com/tools"  
 3     android:layout_width="match_parent"  
 4     android:layout_height="match_parent"  
 5      >  
 6   
 7     <com.android.volley.toolbox.NetworkImageView  
 8         android:id="@+id/networkImageView"  
 9         android:layout_width="fill_parent"  
10         android:layout_height="wrap_content"  
11         android:layout_centerHorizontal="true"  
12         android:layout_marginTop="30dip"  
13     />  
14       
15      <ImageView  
16         android:id="@+id/imageView"  
17         android:layout_width="fill_parent"  
18         android:layout_height="wrap_content"  
19         android:layout_centerInParent="true"  
20     />  
21   
22 </RelativeLayout>

View Code

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

posted on 2013-11-27 16:25 freexiaoyu 阅读(12639) 评论(0) 编辑收藏举报

volley 应用 GET POST请求 图片异步加载

volley 应用 GET POST请求图片异步加载