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：
{
"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:
-
package com.soyoungboy.volleydemo.bean;
import java.io.Serializable;
import com.soyoungboy.volleydemo.utils.GsonImpl;
public class WeathBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
public Weatherinfo weatherinfo;
@Override
public String toString() {
return "WeathBean [weatherinfo=" + weatherinfo + "]";
}
public static WeathBean getBeanFromJson(String response){
WeathBean weathBean= GsonImpl.get().toObject(response, WeathBean.class);
return weathBean ;
}
/**
* Temporary class name, create by Json2Class.
*/
public static class Weatherinfo implements Serializable {
public String SD;
public int isRadar;
public String time;
public int WSE;
public String WS;
public String WD;
public String njd;
public int qy;
public String Radar;
public int temp;
public int cityid;
public String city;
public String getSD() {
return SD;
}
public void setSD(String sD) {
SD = sD;
}
public int getIsRadar() {
return isRadar;
}
public void setIsRadar(int isRadar) {
this.isRadar = isRadar;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public int getWSE() {
return WSE;
}
public void setWSE(int wSE) {
WSE = wSE;
}
public String getWS() {
return WS;
}
public void setWS(String wS) {
WS = wS;
}
public String getWD() {
return WD;
}
public void setWD(String wD) {
WD = wD;
}
public String getNjd() {
return njd;
}
public void setNjd(String njd) {
this.njd = njd;
}
public int getQy() {
return qy;
}
public void setQy(int qy) {
this.qy = qy;
}
public String getRadar() {
return Radar;
}
public void setRadar(String radar) {
Radar = radar;
}
public int getTemp() {
return temp;
}
public void setTemp(int temp) {
this.temp = temp;
}
public int getCityid() {
return cityid;
}
public void setCityid(int cityid) {
this.cityid = cityid;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
@Override
public String toString() {
return "Weatherinfo [SD=" + SD + ", isRadar=" + isRadar + ", time="
+ time + ", WSE=" + WSE + ", WS=" + WS + ", WD=" + WD
+ ", njd=" + njd + ", qy=" + qy + ", Radar=" + Radar
+ ", temp=" + temp + ", cityid=" + cityid + ", city="
+ city + "]";
}
}
}创建界面：
activity_json.xml
-
<?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。
public class JsonActivity extends Activity {
private static final String TAG = "com.soyoungboy.volleydemo.JsonActivity";
private RequestQueue mQueue;
private static final String WEATHER_LINK = "http://www.weather.com.cn/data/sk/101280101.html";
private TextView lvWeatherTv;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_json);
lvWeatherTv = (TextView) findViewById(R.id.lvWeatherTv);
mQueue = Volley.newRequestQueue(this);
getWeatherInfo();
}
public void getWeatherInfo() {
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(
WEATHER_LINK, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
if (!TextUtils.isEmpty(response.toString())) {
WeathBean weathBean = WeathBean
.getBeanFromJson(response.toString());
lvWeatherTv.setText(weathBean.toString());
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
ToastUtils.toastL(getApplicationContext(),
error.getMessage());
}
});
mQueue.add(jsonObjectRequest);
}
}
显示结果：
