最近项目写完，有开始新的学习了，volley很久以前就接触了，也看了源码，然而却没有通过文章去记录自己的学习成果。
首先讲下volley的特点：
1，扩展性强。Volley 中大多是基于接口的设计，可配置性强。
2，一定程度符合 Http 规范，包括返回 ResponseCode(2xx、3xx、4xx、5xx）的处理，请求头的处理，缓存机制的支持等。并支持重试及优先级定义。
3，默认 Android2.3 及以上基于 HttpURLConnection，2.3 以下基于 HttpClient 实现，这两者的区别及优劣在4.2.1 Volley中具体介绍。
4，提供简便的图片加载工具。
现在计划是：
- 写volley相关demo
- 分析volley源码
- 扩展和完善volley,给volley添加一些更加方便开发的功能等。
在编写代码前首先导入volley的库或者引入jar包，这里不进行赘述，只讲使用。
demo1,json数据请求：
首先请求的json数据格式：
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{ "weatherinfo" : { "Radar" : "JC_RADAR_AZ9200_JB", "SD" : "77%", "WD" : "东南风", "WS" : "2级", "WSE" : "2", "city" : "广州", "cityid" : "101280101", "isRadar" : "1", "njd" : "暂无实况", "qy" : "1004", "temp" : "24", "time" : "10:45" } }
首先创建javaBean:
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1 package com.soyoungboy.volleydemo.bean; 2 import java.io.Serializable; 3 import com.soyoungboy.volleydemo.utils.GsonImpl; 4 public class WeathBean implements Serializable { 5 /** 6 * 7 */ 8 private static final long serialVersionUID = 1L; 9 public Weatherinfo weatherinfo; 10 @Override 11 public String toString() { 12 return "WeathBean [weatherinfo=" + weatherinfo + "]"; 13 } 14 public static WeathBean getBeanFromJson(String response){ 15 WeathBean weathBean= GsonImpl.get().toObject(response, WeathBean.class); 16 return weathBean ; 17 } 18 /** 19 * Temporary class name, create by Json2Class. 20 */ 21 public static class Weatherinfo implements Serializable { 22 public String SD; 23 public int isRadar; 24 public String time; 25 public int WSE; 26 public String WS; 27 public String WD; 28 public String njd; 29 public int qy; 30 public String Radar; 31 public int temp; 32 public int cityid; 33 public String city; 34 public String getSD() { 35 return SD; 36 } 37 public void setSD(String sD) { 38 SD = sD; 39 } 40 public int getIsRadar() { 41 return isRadar; 42 } 43 public void setIsRadar(int isRadar) { 44 this.isRadar = isRadar; 45 } 46 public String getTime() { 47 return time; 48 } 49 public void setTime(String time) { 50 this.time = time; 51 } 52 public int getWSE() { 53 return WSE; 54 } 55 public void setWSE(int wSE) { 56 WSE = wSE; 57 } 58 public String getWS() { 59 return WS; 60 } 61 public void setWS(String wS) { 62 WS = wS; 63 } 64 public String getWD() { 65 return WD; 66 } 67 public void setWD(String wD) { 68 WD = wD; 69 } 70 public String getNjd() { 71 return njd; 72 } 73 public void setNjd(String njd) { 74 this.njd = njd; 75 } 76 public int getQy() { 77 return qy; 78 } 79 public void setQy(int qy) { 80 this.qy = qy; 81 } 82 public String getRadar() { 83 return Radar; 84 } 85 public void setRadar(String radar) { 86 Radar = radar; 87 } 88 public int getTemp() { 89 return temp; 90 } 91 public void setTemp(int temp) { 92 this.temp = temp; 93 } 94 public int getCityid() { 95 return cityid; 96 } 97 public void setCityid(int cityid) { 98 this.cityid = cityid; 99 } 100 public String getCity() { 101 return city; 102 } 103 public void setCity(String city) { 104 this.city = city; 105 } 106 @Override 107 public String toString() { 108 return "Weatherinfo [SD=" + SD + ", isRadar=" + isRadar + ", time=" 109 + time + ", WSE=" + WSE + ", WS=" + WS + ", WD=" + WD 110 + ", njd=" + njd + ", qy=" + qy + ", Radar=" + Radar 111 + ", temp=" + temp + ", cityid=" + cityid + ", city=" 112 + city + "]"; 113 } 114 } 115 }
创建界面：
activity_json.xml
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/lvWeatherTv" android:layout_width="match_parent" android:layout_height="match_parent" > </TextView> </LinearLayout>
主要的逻辑：
- 首先创建请求队列 mqueue;
- 创建json请求jsonObjectRequest，实现请求成功和失败的逻辑编写；
- 将请求放入请求队列中去。
1 public class JsonActivity extends Activity { 2 private static final String TAG = "com.soyoungboy.volleydemo.JsonActivity"; 3 private RequestQueue mQueue; 4 private static final String WEATHER_LINK = "http://www.weather.com.cn/data/sk/101280101.html"; 5 private TextView lvWeatherTv; 6 protected void onCreate(Bundle savedInstanceState) { 7 super.onCreate(savedInstanceState); 8 setContentView(R.layout.activity_json); 9 lvWeatherTv = (TextView) findViewById(R.id.lvWeatherTv); 10 mQueue = Volley.newRequestQueue(this); 11 getWeatherInfo(); 12 } 13 public void getWeatherInfo() { 14 JsonObjectRequest jsonObjectRequest = new JsonObjectRequest( 15 WEATHER_LINK, null, new Response.Listener<JSONObject>() { 16 @Override 17 public void onResponse(JSONObject response) { 18 if (!TextUtils.isEmpty(response.toString())) { 19 WeathBean weathBean = WeathBean 20 .getBeanFromJson(response.toString()); 21 lvWeatherTv.setText(weathBean.toString()); 22 } 23 } 24 }, new Response.ErrorListener() { 25 @Override 26 public void onErrorResponse(VolleyError error) { 27 ToastUtils.toastL(getApplicationContext(), 28 error.getMessage()); 29 } 30 }); 31 mQueue.add(jsonObjectRequest); 32 } 33 }
显示结果：
