无法在Android应用中的Object内返回JSON对象 [英] Unable to return JSON Object, within Object in Android app
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问题描述
所以我有一个我正在研究的Android应用程序，它对服务器进行API调用并返回JSON信息。现在在我的Android应用程序中，我可以解析JSON，但直到第一个数组。之后它说该类别不存在。
So I have an Android app I am working on that makes an API call to the server and returns JSON information. Now in my android app I can parse the JSON but only up until the first array. After that it says that category doesn't exist.
这是JSON响应布局：
Here is the JSON response layout:
[
{
"success": 0,
"error": "string",
"response": {
"lastseen": 0,
"mapstats": {
"maps": [
{
"tier": 0,
"modeid": 0,
"modename": "string",
"modecolor": "string",
"bonus": 0,
"name": "string",
"rank": 0,
"time": "string",
"num_completed": 0
}
],
"highest_tier": 0,
"num_beaten": 0,
"percent_completion": 0
},
"tag_color": "string",
"name": "string",
"rank": 0,
"avatar": "string",
"tag": "string",
"playtime": 0,
"percent": 0
}
}
]
这是我的java类：
package com.horizonservers.horizon;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Iterator;
import java.util.jar.Attributes;
import java.util.regex.Pattern;
import javax.net.ssl.HttpsURLConnection;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link MainFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link MainFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MainFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private static final Pattern delimeter = Pattern.compile(",\\s+");
private TextView mResult;
private OnFragmentInteractionListener mListener;
public MainFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MainFragment.
*/
// TODO: Rename and change types and number of parameters
public static MainFragment newInstance(String param1, String param2) {
MainFragment fragment = new MainFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
new PostDataTask().execute("https://www.horizonservers.net/api/v1/PlayerInfo");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_main, container, false);
mResult = (TextView) v.findViewById(R.id.tv_result);
return v;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
class PostDataTask extends AsyncTask<String, Void, String> {
ProgressDialog progressDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
try {
return postData(params[0]);
} catch (IOException ex) {
return "Network error !";
} catch (JSONException ex) {
return "Data Invalid !";
}
}
@Override
protected void onPostExecute(String result) {
try {
JSONObject jsonObject = new JSONObject(result);
String NameInfo = jsonObject.getString("name");
JSONObject jsonObject1 = new JSONObject(NameInfo);
for(int i = 0; i < jsonObject1.length(); i++){
JSONObject jsonPart = new JSONObject();
//Log.i("response", jsonPart.getString("response"));
String newName = jsonPart.getString("name");
//mResult.setText(NameInfo);
mResult.setText(newName);
}
} catch (JSONException e) {
mResult.setText("Error!");
}
super.onPostExecute(result);
if (progressDialog != null) {
progressDialog.dismiss();
}
}
private String postData(String urlPath) throws IOException, JSONException {
StringBuilder result = new StringBuilder();
BufferedWriter bufferedWriter = null;
BufferedReader bufferedReader = null;
try {
//Create data to send to server
JSONObject dataToSend = new JSONObject();
dataToSend.put("apikey", "UPj07lqWdetOWrk9M8Ya9UZzeIAizjr4sYQRKzkHFYm1KaQDopytCFq9HHCerwNy");
dataToSend.put("steamid", "STEAM_0:1:90345825");
dataToSend.put("maptype", "surf");
//Initialize and config request, then connect to server.
URL url = new URL(urlPath);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(10000 /* milliseconds */);
urlConnection.setRequestMethod("POST");
urlConnection.setDoOutput(true); //enable output (body data)
urlConnection.setRequestProperty("Content-Type", "application/json");// set header
urlConnection.connect();
//Write data into server
OutputStream outputStream = urlConnection.getOutputStream();
bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream));
bufferedWriter.write(dataToSend.toString());
bufferedWriter.flush();
//Read data response from server
InputStream inputStream = urlConnection.getInputStream();
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = bufferedReader.readLine()) != null) {
result.append(line).append("&");
}
} finally {
if (bufferedReader != null) {
bufferedReader.close();
}
if (bufferedWriter != null) {
bufferedWriter.close();
}
}
return result.toString();
}
}
}
将信息打印到屏幕的具体部分是
The specific part that prints the information to the screen is
@Override
protected void onPostExecute(String result) {
try {
JSONObject jsonObject = new JSONObject(result);
String NameInfo = jsonObject.getString("name");
JSONObject jsonObject1 = new JSONObject(NameInfo);
for(int i = 0; i < jsonObject1.length(); i++){
JSONObject jsonPart = new JSONObject();
//Log.i("response", jsonPart.getString("response"));
String newName = jsonPart.getString("name");
//mResult.setText(NameInfo);
mResult.setText(newName);
}
} catch (JSONException e) {
mResult.setText("Error!");
}
super.onPostExecute(result);
if (progressDialog != null) {
progressDialog.dismiss();
}
}
如何解析数组/对象中的这些对象。我已经尝试将其转换为数组，但此时它变得更糟。预先感谢您的帮助。
How can I parse these objects from the array/objects. I have already tried converting it to an array, but it becomes worse at that point. Thank you in advance for your help.
推荐答案
我不确定您试图提取的JSON响应中的哪些数据。但我认为使用Google Translate API的这个示例可以帮助您。
I'm not sure which data from your JSON response, you are trying to extract. But I think this example with Google Translate API will help you out.
JSON响应：
"data": {
"translations": [
{
"translatedText": "Hallo Welt",
"detectedSourceLanguage": "en"
}
]
}
如果我想获得翻译的文本，Hallo Welt，我这样做：
If I want to get the translatedText, "Hallo Welt", I do it like this:
public String parseJSONForTranslation(String jsonString) {
try {
JSONObject object = (JSONObject) new JSONTokener(jsonString).nextValue();
return object.getJSONObject("data").getJSONArray("translations").
getJSONObject(0).getString("translatedText");
}
catch (JSONException e) {
return null;
}
}
如你所知，如果你想进一步通过进入JSON响应的下一个级别来提取信息，使用getJSONObject或getJSONArray（取决于它是否为数组），直到达到要提取的数据所在的级别。并且当你处于最后的级别时，你只使用getString。希望这可以帮助你。
So as you can see, if you want to further extract information by going into the next "level" of your JSON response, you use either getJSONObject or getJSONArray (depending on if it's an array or not) until you reach the "level" where the data you want to extract is at. And you only use getString when you are at that last "level". Hopefully, this can help you out.
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