我想检索“opening_hour”对象并解析“open_now”数组。但由于某种原因我无法做到这一点，可能是我的解析层次结构错了。有人可以建议，应该怎么做。以下是我的JSON链接：
if (status == 200) {
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("results");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
Elements parameters = new Elements();
parameters.setTitle(object.getString("name"));
parameters.setImage(object.getString("icon"));
elementList.add(parameters);
}
JSONArray jarraytwo = jsono.getJSONArray("opening_hours");
for (int i = 0; i < jarraytwo.length(); i++) {
JSONObject objecttwo = jarraytwo.getJSONObject(i);
Elements parameterstwo = new Elements();
parameterstwo.setAuthor(objecttwo.getString("open_now"));
Toast.makeText(getApplicationContext(), "open_now : " + objecttwo.getString("open_now"), Toast.LENGTH_LONG).show();
elementListtwo.add(parameterstwo);
}
return true;
这是我所知道的愚蠢问题，但我不知道嵌套的json解析。以下是我的完整代码和我传递的链接
public class MainActivity extends AppCompatActivity {
private static final int REQ_CODE_SPEECH_INPUT = 100;
private TextView mVoiceInputTv;
private ImageButton mSpeakBtn;
private static final int PERMISSION_ACCESS_COARSE_LOCATION = 1;
private GoogleApiClient googleApiClient;
int status;
ArrayList<String> result;
ArrayList<Elements> elementList;
ArrayList<Elements> elementListtwo;
ElementAdaptor adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//mVoiceInputTv = (TextView) findViewById(R.id.voiceInput);
mSpeakBtn = (ImageButton) findViewById(R.id.btnSpeak);
mSpeakBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startVoiceInput();
}
});
}
private void startVoiceInput() {
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Welcome to Harman Framework");
try {
startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
} catch (ActivityNotFoundException a) {
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case REQ_CODE_SPEECH_INPUT: {
if (resultCode == RESULT_OK && null != data) {
result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
//mVoiceInputTv.setText(result.get(0));
Toast.makeText(getApplicationContext(), "You searched : " + result.get(0), Toast.LENGTH_LONG).show();
elementList = new ArrayList<Elements>();
new JSONAsyncTask().execute("https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=-33.8670,151.1957&radius=500&types=food&name=" + result.get(0) + "&key=AIzaSyD_kA7xtNYffQNlykVkVGk5ZNQgQtZFZTk");
ListView listview = (ListView)findViewById(R.id.list);
adapter = new ElementAdaptor(getApplicationContext(), R.layout.row, elementList);
listview.setAdapter(adapter);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long id) {
Intent intent = new Intent(getApplicationContext(), DescriptionActivity.class);
intent.putExtra("title", elementList.get(position).getTitle());
intent.putExtra("author", elementList.get(position).getAuthor());
intent.putExtra("publishedat", elementList.get(position).getPublishedat());
intent.putExtra("description", elementList.get(position).getDescription());
intent.putExtra("imageurl", elementList.get(position).getImage());
startActivity(intent);
}
});
}
break;
}
}
}
//String url = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=-33.8670,151.1957&radius=500&types=food&name=" + result.get(0) + "&key=AIzaSyD_kA7xtNYffQNlykVkVGk5ZNQgQtZFZTk";
class JSONAsyncTask extends AsyncTask<String, Void, Boolean> {
ProgressDialog dialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("Loading.......");
dialog.setTitle("Connecting server");
dialog.show();
dialog.setCancelable(false);
}
@Override
protected Boolean doInBackground(String... urls) {
try {
HttpGet httppost = new HttpGet(urls[0]);
HttpParams httpParameters = new BasicHttpParams();
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(httppost);
HttpParams params = httpclient.getParams();
status = response.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("results");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
Elements parameters = new Elements();
parameters.setTitle(object.getString("name"));
parameters.setImage(object.getString("icon"));
elementList.add(parameters);
}
return true;
}
} catch (JSONException e3) {
e3.printStackTrace();
} catch (IOException e2) {
e2.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean result) {
dialog.cancel();
adapter.notifyDataSetChanged();
if(result == false)
Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
}
}
}
答案 0 :(得分：1)
您需要将for循环嵌套到彼此中。看看你的JSON文件的结构：你有jarray，它是一个JSON对象数组。阵列中的每个JSON对象都有自己的开放时间。所以你想要这样的事情：
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
Elements parameters = new Elements();
parameters.setTitle(object.getString("name"));
parameters.setImage(object.getString("icon"));
elementList.add(parameters);
// Get opnening hours for current result
JSONObject curOpeningHours = object.getJSONObject("opening_hours");
hoursList.push(curOpeningHours);
String openNow = curOpeningHours.getString("open_now");
// Do something...
}
它没有测试这个，但它应该给你一个想法
答案 1 :(得分：0)
使用嵌套的JSONObject
JSONArray jarray = jsono.getJSONArray("results");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
JSONArray jarray1 = object.getJSONArray("opening_hours");
for (int j = 0; j < jarray1.length(); j++) {
JSONObject object2 = jarray1.getJSONObject(j);
parameters.setOpenNow(object2.getString("open_now"));
}
}
答案 2 :(得分：0)
在解析复杂的json时，或者如果json至少包含一个对象数组，我根本不会使用JSONObject。 而是使用google-gson。
使用gson，您可以用更少的代码和精力序列化/反序列化您的json。
我首先创建一个java类，代表您尝试解析的相同json方案。
例如，尝试解析此JSon字符串：
[
{
"FirstName": "What",
"LastName": "Ever"
},
{
"FirstName": "John",
"LastName": "Snow"
}
]
在java代码中，我首先创建一个类：
public class Person {
public String FirstName;
public String LastName;
}
现在解析json：
Gson gson = new Gson();
List<Person> people = gson.fromJson("Json string here", new TypeToken<List<Person>>() {}.getType());
现在你可以在列表上做一个循环，找到John Snow。