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我这里有一个 ListFragment,它使用一个 url 来使用 GSON 库解析 JSON。后台任务截击:
public class LatestFragment extends ListFragment {
public LatestFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_latest, container,
false);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
arrItemList = new ArrayList<ItemListModel>();
va = new LatestAdapter(getActivity(), arrItemList);
loadItemList(1);
}
private void loadItemList(int page) {
mRequestQueue = Volley.newRequestQueue(getActivity());
pd = ProgressDialog.show(getActivity(), null, "Loading...");
// TODO use Volley param
currentPage = page;
param = "?page=" + currentPage;
String url = Constants.LATEST_ITEM_LIST + param;
GsonRequest<ItemListModel> myReq = new GsonRequest<ItemListModel>(
Method.GET, url, ItemListModel.class,
createMyReqSuccessListener(), createMyReqErrorListener());
mRequestQueue.add(myReq);
}
private Response.Listener<ItemListModel> createMyReqSuccessListener() {
return new Response.Listener<ItemListModel>() {
@Override
public void onResponse(ItemListModel response) {
try {
Log.d("response > ", response.toString());
pd.dismiss();
} catch (Exception e) {
e.printStackTrace();
}
};
};
}
private Response.ErrorListener createMyReqErrorListener() {
return new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
};
}
}
当我运行应用程序时,它显示response
为null。
这是ItemListModel
:
public class ItemListModel {
private String user_id;
private String item_id;
private String name;
private String price;
private String category;
private ThumbnailModel thumbnail; // not array list
public ItemListModel(){}
//getters
@Override
public String toString() {
return "ItemListModel [user_id=" + user_id + ", item_id=" + item_id
+ ", name=" + name + ", price=" + price + ", category="
+ category + ", thumbnail=" + thumbnail + "]";
} // ALL NULL
}
反序列化这个 JSON 格式:
{
"results": [
{
"user_id": "1",
"item_id": "18630",
"name": "Unnamed Item",
"price": "0",
"description": "",
"created_at": "2014-01-16 15:31:36",
"thumbnail": {
"image50": "http://www.example.com/adsa.jpg",
"image100": "hhttp://www.example.com/adsa.jpg"
},...
这次我做错了什么?我应该坚持使用 Volley 的 JSONArrayRequest 吗?嗯。
最佳答案
您为 Json 响应创建的模型有问题。
{
"results": [
{
"user_id": "1",
"item_id": "18630",
"name": "Unnamed Item",
"price": "0",
"description": "",
"created_at": "2014-01-16 15:31:36",
"thumbnail": {
"image50": "http://www.example.com/adsa.jpg",
"image100": "hhttp://www.example.com/adsa.jpg"
},...
像这样尝试上面的 Json 响应
public class ItemListModel {
public ArrayList<Result> results;
@Override
public String toString() {
return "Response [results=" + results + "]";
}
public ArrayList<Result> getResults() {
return results;
}
}
然后
public class Result {
private String user_id;
private String item_id;
private String name;
private String price;
private String description;
private String created_at;
private ThumbnailModel thumbnail;
public String getUser_id() {
return user_id;
}
public String getItem_id() {
return item_id;
}
public String getName() {
return name;
}
public String getPrice() {
return price;
}
public String getDescription() {
return description;
}
public String getCreated_at() {
return created_at;
}
public ThumbnailModel getThumbnail() {
return thumbnail;
}
@Override
public String toString() {
return "Result [user_id=" + user_id + ", item_id=" + item_id
+ ", name=" + name + ", price=" + price + ", description="
+ description + ", created_at=" + created_at + ", thumbnail="
+ thumbnail + "]";
}
}
最后
public class ThumbnailModel {
private String image50;
private String image100;
public String getImage50() {
return image50;
}
public String getImage100() {
return image100;
}
@Override
public String toString() {
return "ThumbnailModel [image50=" + image50 + ", image100=" + image100
+ "]";
}
这是上述 Json 的正确模型。
编辑:-
private Response.Listener<ItemListModel> createMyReqSuccessListener() {
return new Response.Listener<ItemListModel>() {
@Override
public void onResponse(ItemListModel response) {
try {
Log.d("Name> ", response.getResults().get(0).getName());//Edited
Log.d("ThumbnailModel Image> ", response.getResults().get(0).getThumbnail().getImage100());//Edited
pd.dismiss();
} catch (Exception e) {
e.printStackTrace();
}
};
};
}
希望这对你有用。
关于java - Android - GsonRequest 返回 null,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21158432/
我目前正在制作一个 GsonRequest,如下所示: final GsonRequest gsonRequest = new GsonRequest(url, People.class, n
我这里有一个 ListFragment,它使用一个 url 来使用 GSON 库解析 JSON。后台任务截击: public class LatestFragment extends ListFrag
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