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 }
<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
