Android JSON使用GSON解析数组 [英] Android JSON parsing arrays with GSON
本文介绍了Android JSON使用GSON解析数组的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
Adventures ：
+ ------------- +
|冒险1 |
+ ------------- +
|冒险2 |
+ ------------- +
活动：
+ ------------- +
|事件1 |
+ ------------- +
|事件2 |
+ ------------- +
I'能够读出单个字符串很好，但我没有把我的头移动到数组。我收到的JSON格式是：
{
events：[
{
eid：11111111，
bid：aaaaaaaa，
bname：示例商业1，
开始：3/26/14 @ 6pm，
end：3/27/14 @ 2am，
points：50，
title：示例事件1，
description：示例事件描述，
cat：夜生活，
type：酒吧，
子类型：卡拉OK，
有效：真
}，
{
eid：22222222，
bid：bbbbbbbb，
bname：示例商务2，
start：3/26/14 @ 6pm，
end：3/27/14 @ 2am，
points：
title：示例事件2，
description：示例事件描述，
cat：夜生活，
type ：喜剧，
子类型：一般，
有效：真
}，
{
eid：33333333，
bid：cccccccc，
bname：示例商业3，
开始：3 / 26/14 @ 6pm，
end：3/27/14 @ 2am，
points：150，
title：示例事件3 ，
description：示例事件描述，
cat：Dining，
type：Restraunt，
subtype：Chinese ，
valid：true
}
]，
冒险：[
{
aid：11111111，
出价：aaaaaaaa，
开始：3/26/14 6pm，
结束：3/27/14 2am，
分 ：
title：示例冒险1，
description：示例冒险描述，
cat：夜生活，
类型：酒吧，
子类型：卡拉OK，
steps_comp：2，
total_steps：5，
有效 ：true
}，
{
aid：2 2222222，
bid：bbbbbbbb，
start：3/26/14 6pm，
end：3/27/14 2am，
points：250，
title：示例冒险2，
description：示例冒险描述，
cat： ，
type：Bar，
subtype：Neighborhood，
steps_comp：0，
total_steps：5，
valid：true
}
]
}} p>
我使用以下（包含排球代码）解析出JSON：
RequestQueue队列= Volley.newRequestQueue（this）;
JsonObjectRequest jsObjRequest = new JsonObjectRequest（Request.Method.GET，full_url，null，new Response.Listener< JSONObject>（）{
@Override $ b $ public void onResponse（JSONObject response）{
String example = response.toString（）;
Log.e（JSON Response，example）;
try {
JsonParser jsonParser = new JsonParser（）;
JsonObject jo =（JsonObject）jsonParser.parse（example）;
JsonArray jsonArr = jo.getAsJsonArray（events）;
// jsonArr。
Gson googleJson = new Gson（ ）;
ArrayList jsonObjList = googleJson.fromJson（jsonArr，ArrayList.class）;
System.out.println（List size is：+ jsonObjList.size（））;
System.out.println（List Elements are：+ jsonObjList.toString（））;
for（int i = 0; i< jsonObjList.size（）; i ++）{
String item = jsonObjList.get（i）.toString（）;
System.out.println（Item+ i +：+ item）;
}
Toast.makeText（getApplicationContext（），0：+ jsonObjList.get（0），
Toast.LENGTH_LONG）.show（）;
} catch（Exception e）{
// TODO自动生成的catch块
e.printStackTrace（）;
}
Toast.makeText（getApplicationContext（），blah，
Toast.LENGTH_LONG）.show（）;
}
}，新的Response.ErrorListener（）{
@Override
public void onErrorResponse（VolleyError error）{
// TODO自动生成的方法存根
}
}
）;
queue.add（jsObjRequest）;
我得到每一行都很好，但它只是一个字符串，所以我无法获取每个单独的元素。我想我可能需要在for循环中再做一次GSON调用来打破这个问题，然后放入数组中？这似乎很混乱。我已经做了一些googleing（我已经得到了这么多），但我似乎无法将这些作品放在一起，使这一个工作。任何帮助将不胜感激。
解决方案
首先为每个JsonAarry创建类以容纳价值
public class Events {
private String eid;
私人字符串出价;
私人字符串bname;
私有字符串开始;
私人字符串结束;
私人弦乐分数;
私有字符串标题;
私有字符串描述;
私人字符串猫;
私有字符串类型;
私有字符串子类型;
私有布尔有效;
@Override
public String toString（）{
returnEvents [eid =+ eid +，bid =+ bid +，bname =+ bname
+ ，start =+ start +，end =+ end +，points =+ points
+，title =+ title +，description =+ description
+， cat =+ cat +，type =+ type +，subtype =+ subtype
+，valid =+ valid +];
}
}
和
public class Adventures {
private String aid;
私人字符串出价;
私有字符串开始;
私人字符串结束;
私人弦乐分数;
私有字符串标题;
私有字符串描述;
私人字符串猫;
私有字符串类型;
私有字符串子类型;
private String steps_comp;
@Override
public String toString（）{
returnAdventures [aid =+ aid +，bid =+ bid +，start =+ start
+ ，end =+ end +，points =+ points +，title =+ title
+，description =+ description +，cat =+ cat +，type =
+ type +，subtype =+ subtype +，steps_comp =+ steps_comp
+，total_steps =+ total_steps +，valid =+ valid +];
}
private String total_steps;
私有布尔有效;
$ / code> 现在创建一个保存整个响应的类
public class ResponseHolder {
private ArrayList< Events>事件;
private ArrayList< Adventures>冒险;
@Override
public String toString（）{
returnResponseHolder [events =+ events +，adventures =
+ adventures +];
}
public ArrayList< Events> getEvents（）{
返回事件;
}
public ArrayList< Adventures> getAdventures（）{
返回冒险;
}
}
最后
Gson googleJson = new Gson（）;
ResponseHolder rh = googleJson.fromJson（jsonArr，ResponseHolder.class）;
并获取数据，例如
<$ p $ （事件e：rh.getEvents（））{
System.out.println（e.toString（））; p>
（Adventures e：rh.getAdventures（））{
System.out.println（e.toString（））;
}
I've been fighting with GSON for the better part of the day. Well, not the GSON so much as my general non-understanding of lists in Android I think. Basically what is happening is I am receiving 2 arrays in JSON, which will then each be formatted and displayed in a list:
Adventures:
+-------------+
| Adventure 1 |
+-------------+
| Adventure 2 |
+-------------+
Events:
+-------------+
| Event 1 |
+-------------+
| Event 2 |
+-------------+
I'm able to read out individual string just fine, but I'm not getting my head around moving this on to arrays. JSON format I'm recieving is:
{
"events": [
{
"eid": "11111111",
"bid": "aaaaaaaa",
"bname": "Example Business 1",
"start": "3/26/14 @ 6pm",
"end": "3/27/14 @ 2am",
"points": "50",
"title": "Example Event 1",
"description": "Example Event Description",
"cat": "Nightlife",
"type": "Bar",
"subtype": "Karaoke",
"valid": true
},
{
"eid": "22222222",
"bid": "bbbbbbbb",
"bname": "Example Business 2",
"start": "3/26/14 @ 6pm",
"end": "3/27/14 @ 2am",
"points": "50",
"title": "Example Event 2",
"description": "Example Event Description",
"cat": "Nightlife",
"type": "Comedy",
"subtype": "General",
"valid": true
},
{
"eid": "33333333",
"bid": "cccccccc",
"bname": "Example Business 3",
"start": "3/26/14 @ 6pm",
"end": "3/27/14 @ 2am",
"points": "150",
"title": "Example Event 3",
"description": "Example Event Description",
"cat": "Dining",
"type": "Restraunt",
"subtype": "Chinese",
"valid": true
}
],
"adventures": [
{
"aid": "11111111",
"bid": "aaaaaaaa",
"start": "3/26/14 6pm",
"end": "3/27/14 2am",
"points": "150",
"title": "Example Adventure 1",
"description": "Example Adventure Description",
"cat": "Nightlife",
"type": "Bar",
"subtype": "Karaoke",
"steps_comp": "2",
"total_steps": "5",
"valid": true
},
{
"aid": "22222222",
"bid": "bbbbbbbb",
"start": "3/26/14 6pm",
"end": "3/27/14 2am",
"points": "250",
"title": "Example Adventure 2",
"description": "Example Adventure Description",
"cat": "Nightlife",
"type": "Bar",
"subtype": "Neighborhood",
"steps_comp": "0",
"total_steps": "5",
"valid": true
}
]
}
I'm parsing out the JSON with the following (Volley code included):
RequestQueue queue = Volley.newRequestQueue(this);
JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.GET, full_url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
String example = response.toString();
Log.e("JSON Response", example);
try {
JsonParser jsonParser = new JsonParser();
JsonObject jo = (JsonObject)jsonParser.parse(example);
JsonArray jsonArr = jo.getAsJsonArray("events");
//jsonArr.
Gson googleJson = new Gson();
ArrayList jsonObjList = googleJson.fromJson(jsonArr, ArrayList.class);
System.out.println("List size is : "+jsonObjList.size());
System.out.println("List Elements are : "+jsonObjList.toString());
for (int i = 0; i < jsonObjList.size(); i++){
String item = jsonObjList.get(i).toString();
System.out.println("Item " + i + " : " + item);
}
Toast.makeText(getApplicationContext(), "0: "+jsonObjList.get(0),
Toast.LENGTH_LONG).show();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), "blah",
Toast.LENGTH_LONG).show();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
}
);
queue.add(jsObjRequest);
I'm getting each row just fine, but it's just a string so I'm not able to get at the individual elements for each. I'm thinking I might need to do another GSON call inside the for loop to break that one as well, then place inside of a array? This seems messy. I've done a bit of googleing(how I've gotten this far), but I can't seem to put the pieces together to make this one work. Any help would be appreciated.
解决方案
First create class for each JsonAarry to hold the vales
public class Events {
private String eid;
private String bid;
private String bname;
private String start;
private String end;
private String points;
private String title;
private String description;
private String cat;
private String type;
private String subtype;
private boolean valid;
@Override
public String toString() {
return "Events [eid=" + eid + ", bid=" + bid + ", bname=" + bname
+ ", start=" + start + ", end=" + end + ", points=" + points
+ ", title=" + title + ", description=" + description
+ ", cat=" + cat + ", type=" + type + ", subtype=" + subtype
+ ", valid=" + valid + "]";
}
}
and
public class Adventures {
private String aid;
private String bid;
private String start;
private String end;
private String points;
private String title;
private String description;
private String cat;
private String type;
private String subtype;
private String steps_comp;
@Override
public String toString() {
return "Adventures [aid=" + aid + ", bid=" + bid + ", start=" + start
+ ", end=" + end + ", points=" + points + ", title=" + title
+ ", description=" + description + ", cat=" + cat + ", type="
+ type + ", subtype=" + subtype + ", steps_comp=" + steps_comp
+ ", total_steps=" + total_steps + ", valid=" + valid + "]";
}
private String total_steps;
private boolean valid;
}
Now create a class that hold the whole response
public class ResponseHolder {
private ArrayList<Events> events;
private ArrayList<Adventures> adventures;
@Override
public String toString() {
return "ResponseHolder [events=" + events + ", adventures="
+ adventures + "]";
}
public ArrayList<Events> getEvents() {
return events;
}
public ArrayList<Adventures> getAdventures() {
return adventures;
}
}
and finally
Gson googleJson = new Gson();
ResponseHolder rh= googleJson.fromJson(jsonArr, ResponseHolder.class);
And get the data like
for(Events e: rh.getEvents()){
System.out.println(e.toString());
}
for(Adventures e: rh.getAdventures()){
System.out.println(e.toString());
}
这篇关于Android JSON使用GSON解析数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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