问题描述
我正在构建一个Android应用程序,我是json的新手。我在josn formate下面获取 -
I am building an android application and I am new to json. I am fetching below josn formate -
{
"contact"[
{
"key1": "hey1",
"key2": [
{
"key3": "hey2"
}
]
}
]
}
我使用下面的代码来获取key1值。我现在遇到的问题是如何获取key3值 -
I am using below code to fetch key1 value. Now problem I am facing is how to fetch key3 value -
jsonString = http.makeServiceCall(url, ServiceHandler.GET, null);
if (jsonString != null) {
try {
JSONObject jsonObj = new JSONObject(jsonString);
// Getting JSON Array node
questions = jsonObj.getJSONArray(TAG_CONTACTS);
for (int i = 0; i < questions.length(); i++) {
temp_obj = questions.getJSONObject(i);
key1Array.add(temp_obj.getString("key1").toString());
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
请帮帮我
推荐答案
如果您想使用Gson解析您的json数据。试一试:
If you want to use Gson to parse your json data. Let try it:
首先,你必须像这样修改你的json:
First of all, you must modify your json like this:
{
"contact":[
{
"key1": "hey1",
"key2": [
{
"key3": "hey2"
}
]
}
]
}
第二次将Gson添加到您的lib并同步build.gradle:download 提取它,并将gson-2.2.4.gson复制/过去到libs文件夹。
Second add Gson to your libs and sync build.gradle: download here extract it, and copy/past gson-2.2.4.gson to libs folder.
第三次创建一些类:
FullContents.java:
FullContents.java:
public class FullContents {
private List<ObjectKey> contact;
public List<ObjectKey> getContact() {
return contact;
}
public void setContact(List<ObjectKey> contact) {
this.contact = contact;
}
}
ObjectKey.java:
ObjectKey.java:
public class ObjectKey {
private String key1;
private List<ObjectKey3> key2;
public List<ObjectKey3> getKey2() {
return key2;
}
public void setKey2(List<ObjectKey3> key2) {
this.key2 = key2;
}
public String getKey1(){
return key1;
}
public void setKey1(String key1){
this.key1 = key1;
}
}
ObjectKey3.java:
ObjectKey3.java:
public class ObjectKey3 {
private String key3;
public String getKey3(){
return key3;
}
public void setKey3(String key3){
this.key3 = key3;
}
}
最后,获取来自url的数据:
And Finally, get data from url:
private class ParseByGson extends AsyncTask<String,Void,FullContents> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected FullContents doInBackground(String... params) {
FullContents fullContents = null;
try {
URL url=new URL(params[0]);
InputStreamReader reader=new InputStreamReader(url.openStream(),"UTF-8");
fullContents=new Gson().fromJson(reader,FullContents.class);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return fullContents;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(FullContents results) {
super.onPostExecute(results);
ObjectKey objectKey = results.getContact().get(0);
Log.e(">>",objectKey.getKey1()+"--");
}
}
您可以将以下代码放在onCreate上:
you can put below code to onCreate:
ParseByGson parseByGson = new ParseByGson();
parseByGson.execute(urlStringHere);
更新:解释
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