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