【第四篇】Volley修改之GsonRequest

json解析工具类的引入，这里引用lite马天宇的解析json的工具类：

public class GsonImpl extends Json {
private Gson gson = new Gson();

@Override
public String toJson(Object src) {
return gson.toJson(src);
}

@Override
public <T> T toObject(String json, Class<T> claxx) {
return gson.fromJson(json, claxx);
}

@Override
public <T> T toObject(byte[] bytes, Class<T> claxx) {
return gson.fromJson(new String(bytes), claxx);
}

}

public abstract class Json {
private static Json json;

Json() {}

public static Json get() {
if (json == null) {
json = new GsonImpl();
}
return json;
}

public abstract String toJson(Object src);

public abstract <T> T toObject(String json, Class<T> claxx);

public abstract <T> T toObject(byte[] bytes, Class<T> claxx);
}

集成子Request，在parseNetworkResponse方法里面封装解析json的逻辑

public class GsonRequest<T> extends Request<T> {
private Class<T> mClazz;
private Listener<T> listener;
private Map<String, String> headers;

/**
*
* @param method
*            請求方式
* @param url
*            获取json的url
* @param clazz
*            json对应的javaBean
* @param headers
*            头文件
* @param listener
*            监听
* @param errorListener
*            错误监听
*/

public GsonRequest(int method, String url, Class<T> clazz,
Map<String, String> headers, Listener<T> listener,
ErrorListener errorListener) {
super(method, url, errorListener);
this.mClazz = clazz;
this.headers = headers;
this.listener = listener;
}

/**
* 获取头文件
*/
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
return headers != null ? headers : super.getHeaders();
}

/**
* 解析json
*/
@Override
protected Response<T> parseNetworkResponse(NetworkResponse response) {
String jsonString;
try {
jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(
GsonImpl.get().toObject(jsonString, mClazz),
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
}
}

/**
* 分发返回内容
*/
@Override
protected void deliverResponse(T response) {
listener.onResponse(response);
}
}

使用demo:

1 ，添加网络权限；

2，编码：
http://www.weather.com.cn/data/sk/101010100.html里面的json数据如下：

{"weatherinfo":{"city":"北京","cityid":"101010100","temp":"9","WD":"西南风","WS":"2级","SD":"22%","WSE":"2","time":"10:45","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1014"}}

对应的javaBean为如下两个类：

public class Weather implements Serializable{

private static final long serialVersionUID = 1L;
private Weatherinfo weatherinfo;

public Weatherinfo getWeatherinfo() {
return weatherinfo;
}

public void setWeatherinfo(Weatherinfo weatherinfo) {
this.weatherinfo = weatherinfo;
}

@Override
public String toString() {
return "Weather [weatherinfo=" + weatherinfo + "]";
}
}

和Weatherinfo类：

public class Weatherinfo implements Serializable{

private static final long serialVersionUID = 1L;
private String city;
private String cityid;
private String temp;
private String WD;
private String WS;
private String SD;
private String WSE;
private String time;
private String isRadar;
private String Radar;
private String njd;
private String qy;

public String getCity() {
return city;
}

public void setCity(String city) {
this.city = city;
}

public String getCityid() {
return cityid;
}

public void setCityid(String cityid) {
this.cityid = cityid;
}

public String getTemp() {
return temp;
}

public void setTemp(String temp) {
this.temp = temp;
}

public String getWD() {
return WD;
}

public void setWD(String wD) {
WD = wD;
}

public String getWS() {
return WS;
}

public void setWS(String wS) {
WS = wS;
}

public String getSD() {
return SD;
}

public void setSD(String sD) {
SD = sD;
}

public String getWSE() {
return WSE;
}

public void setWSE(String wSE) {
WSE = wSE;
}

public String getTime() {
return time;
}

public void setTime(String time) {
this.time = time;
}

public String getIsRadar() {
return isRadar;
}

public void setIsRadar(String isRadar) {
this.isRadar = isRadar;
}

public String getRadar() {
return Radar;
}

public void setRadar(String radar) {
Radar = radar;
}

public String getNjd() {
return njd;
}

public void setNjd(String njd) {
this.njd = njd;
}

public String getQy() {
return qy;
}

public void setQy(String qy) {
this.qy = qy;
}

@Override
public String toString() {
return "Weatherinfo [city=" + city + ", cityid=" + cityid + ", temp="
+ temp + ", WD=" + WD + ", WS=" + WS + ", SD=" + SD + ", WSE="
+ WSE + ", time=" + time + ", isRadar=" + isRadar + ", Radar="
+ Radar + ", njd=" + njd + ", qy=" + qy + "]";
}

}

Activity里面：

public class MainActivity extends Activity {
private String url = "http://www.weather.com.cn/data/sk/101010100.html";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RequestQueue mQueue = Volley.newRequestQueue(this);
GsonRequest<Weather> request = new GsonRequest<Weather>(Method.GET, url, Weather.class, null, new Response.Listener<Weather>() {

@Override
public void onResponse(Weather response) {
Toast.makeText(getApplicationContext(), response.toString(), Toast.LENGTH_LONG).show();
}
}, new Response.ErrorListener() {

@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
});
mQueue.add(request);

}
}