Gson使用简记
在APP的开发过程中，必不可少的就是网络请求，请求服务器，得到数据，解析数据并加载到控件上，实现了APP的动态数据显示。
在解析数据的方法上也是多种多样的，之前用的都是JsonObject、JsonArray直接解析出来，后来发现用Gson配合Android Studio的 GsonFormat可以更加快速地解析数据。
首先，导入Gson包，在Android Studio的gradle里面添加：
dependencies {
compile 'com.google.code.gson:gson:2.6.2'
}服务器返回值如下：
{
"status": true,
"info": "获取成功",
"results": {
"version": "1",
"title": "测试标题",
"url": "http://www.baidu.com"
}}然后，用GsonFormat生成Bean文件:
public class WelcomePic {
/**
* status : true
* info : 获取成功
* results : {"version":"1","title":"测试标题","url":"http://www.baidu.com"}
*/
private boolean status;
private String info;
/**
* version : 1
* title : 测试标题
* url : http://www.baidu.com
*/
private ResultsBean results;
public boolean isStatus() {
return status;
}
public void setStatus(boolean status) {
this.status = status;
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
public ResultsBean getResults() {
return results;
}
public void setResults(ResultsBean results) {
this.results = results;
}
public static class ResultsBean {
private int version;
private String title;
private String url;
public int getVersion() {
return version;
}
public void setVersion(int version) {
this.version = version;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
}获取网路数据用的是Volley：
/**
* 获取欢迎界面的图片
*/
private void getWelcome() {
StringRequest stringRequest = new StringRequest(Baseurl.Welcome, new Response.Listener() {
@Override
public void onResponse(String response) {
Gson gson = new Gson();
WelcomePic welcomePic = gson.fromJson(response,WelcomePic.class);
WelcomePic.ResultsBean resultsBean = welcomePic.getResults();
if (welcomePic.isStatus()){
ToastUtil.showToast(context,
resultsBean.getTitle()+resultsBean.getUrl()+resultsBean.getVersion());
}
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
queue.add(stringRequest);
} 如果返回的数据包含了列表，原理类似：
{
"status": true,
"info": "获取信息成功",
"results": [
{
"id": "199",
"title": "APP1.1版本更新",
"classid": "1",
"info": "APP1.1版本更新，请更新APP",
"time": "2016-01-18 15:26:54",
"see": "1",
"type": "系统"
},
{
"id": "198",
"title": "欢迎使用APP,
"classid": "2",
"info": "欢迎使用APP，希望你喜欢",
"time": "2016-01-18 15:27:55",
"see": "1",
"type": "通知"
}
]
}GsonFormat生成的Bean与之前的有点区别,前面的ResultsBean,后面的是List：
public class MessageBean {
private boolean status;
private String info;
private List results;
public boolean isStatus() {
return status;
}
public void setStatus(boolean status) {
this.status = status;
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
public List getResults() {
return results;
}
public void setResults(List results) {
this.results = results;
}
public static class ResultsBean {
private String id;
private String title;
private String classid;
private String info;
private String time;
private int see;
private String type;
private String url;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getClassid() {
return classid;
}
public void setClassid(String classid) {
this.classid = classid;
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public int getSee() {
return see;
}
public void setSee(int see) {
this.see = see;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
} 处理返回的数据：
private void GetInfolist() {
String path = ""
StringRequest string = new StringRequest(path, new Response.Listener() {
@Override
public void onResponse(String response) {
Gson gson = new Gson();
MessageBean messageBean = gson.fromJson(response, MessageBean.class);
List resultsBeen = messageBean.getResults();
if (messageBean.isStatus()) {
for (int i = 0; i < resultsBeen.size(); i++) {
if (resultsBeen.get(i).getSee() == 0) {
resultsBeen.get(i).setSee(R.mipmap.ico_message_issee);
} else {
resultsBeen.get(i).setSee(Color.parseColor("#080809"));
}
messageBean.setResults(resultsBeen);
}
list.add(messageBean);
mAdapter.notifyDataSetChanged();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
mqueue.add(string);
}