我正在尝试用Google Gson库解析Json,但目前无法将其工作...
这是我应该得到的杰森:
{
"shoppingLists": [
{
"ShoppingList": {
"id": "51",
"name": "loool",
"created": "2014-03-22 13:03:22",
"modified": "2014-03-22 13:03:22"
},
"ShoppingItem": [
{
"id": "24",
"shopping_item_category_id": "19",
"name": "Biscuits",
"description": "",
"created": "2014-02-05 17:43:45",
"modified": "2014-02-05 17:43:45",
"category_name": "Confiseries \/ Gouters"
},
{
"id": "25",
"shopping_item_category_id": "19",
"name": "Snickers",
"description": "",
"created": "2014-02-05 17:44:08",
"modified": "2014-02-05 17:44:08",
"category_name": "Confiseries \/ Gouters"
},
{
"id": "26",
"shopping_item_category_id": "19",
"name": "C\u00e9reales",
"description": "",
"created": "2014-02-05 17:44:57",
"modified": "2014-02-05 17:44:57",
"category_name": "Confiseries \/ Gouters"
}
]
}
]
}
这是我的模特:
shoppingLists:
public class shoppingLists {
public ShoppingList ShoppingList;
public List<ShoppingItem> ShoppingItems;
}
购物清单 :
public class ShoppingList {
public int id;
public String name;
public String created;
public String modified;
}
ShoppingItem:
public class ShoppingItem {
public int id;
public int shopping_item_category_id;
public String name;
public String description;
public String created;
public String modified;
public String category_name;
}
这是我的AsyncTask,它从服务器获取Json:
public class APIRetrieveLists extends AsyncTask<APIRequestModel, Void, List<shoppingLists>>{
SQLHelper _sqlHelper = null;
Context _context;
ProgressBar _pb;
public APIRetrieveLists(Context context, ProgressBar pb){
this._context = context;
this._pb = pb;
}
@Override
protected void onPreExecute(){
}
@Override
protected void onPostExecute(List<shoppingLists> model){
this._sqlHelper = new SQLHelper(this._context);
if (model != null){
for (shoppingLists cn : model){
Log.i("infos", "list's name => " + cn.ShoppingList.name);
}
}else{
Log.i("infos", "model is null");
}
}
@Override
protected List<shoppingLists> doInBackground(APIRequestModel... arg0) {
APIRequestModel model = arg0[0];
try
{
try
{
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("access_token", model.getToken()));
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://apiurl/index.json");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));
HttpResponse response = httpclient.execute(httppost);
BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String s = "";
String all = "";
while ((s = reader.readLine()) != null){
all += s;
}
Gson gson = new Gson();
List<shoppingLists> Obj = (List<shoppingLists>) gson.fromJson(all, new TypeToken<List<shoppingLists>>(){}.getType());
return (Obj);
}
catch (ClientProtocolException e) {
Log.i("infos", "first");
return (null);
}
}
catch (Exception e){
Log.i("infos", "second");
return (null);
}
}
}
总是触发异常“ second”。Log.i(“ infos”,“ model为null”); 也被执行。如果有人可以帮助:)谢谢!问候。
在您的shoppingLists中再添加一个包装器,因为jsonObject将shoppingLists作为键,并将ShoppingListItem的数组作为值。另外,您还需要@SerializedName
为ShoppingItems字段添加注释,因为它与Json中的键不匹配。
查找以下更新的类和解析器
Gson gson = new Gson();
FinalClass myObj = gson.fromJson(jsonString, FinalClass.class);
班级
public class FinalClass {
public ArrayList<ShoppingListItem> shoppingLists;
}
public class ShoppingListItem {
public ShoppingList ShoppingList;
@SerializedName("ShoppingItem")
public List<ShoppingItem> ShoppingItems;
}
public class ShoppingList {
public int id;
public String name;
public String created;
public String modified;
}
public class ShoppingItem {
public int id;
public int shopping_item_category_id;
public String name;
public String description;
public String created;
public String modified;
public String category_name;
}
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