Develop Reference

How to access object>array>object>array>object in json?

I have to fetch text via json in url .
The hierarchy is given below :
object>array>object>array>object.
I want to get text with this code .But I am getting error :org.json.JSONException: No value for text
Below is the code :-
public class ListViewActivity extends Activity {
// Log tag
private static final String TAG = ListViewActivity.class.getSimpleName();
// change here url of server api
private static final String url = "http://2e9b8f52.ngrok.io/api/v1/restaurants?per_page=5&km=1&location=true&lat=19.0558306414&long=72.8339840099";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Movie movie = movieList.get(position);
Intent intent = new Intent(ListViewActivity.this, SecondActivity.class);
intent.putExtra("name", movie.getName());
intent.putExtra("average_ratings", movie.getAverage_ratings());
intent.putExtra("full_address", movie.getAddress());
intent.putExtra("image_url", movie.getThumbnailUrl());
intent.putExtra("cuisine",movie.getCuisine());
intent.putExtra("cost",movie.getCost());
startActivity(intent);
}
});
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Please Keep patience.Its loading...");
pDialog.show();
// Creating volley request obj
JsonObjectRequest movieReq = new JsonObjectRequest(Request.Method.GET,
url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
Log.d(TAG, response.toString());
JSONArray
restaurantsJSONArray= null;
try {
restaurantsJSONArray = response.getJSONArray("restaurants");
} catch (JSONException e) {
e.printStackTrace();
}
hidePDialog();
// Parsing json
for (int i = 0; i < restaurantsJSONArray.length(); i++) {
try {
JSONObject obj =restaurantsJSONArray.getJSONObject(i);
Movie movie = new Movie();
//movie.setTitle(obj.getString("title"));
movie.setName(obj.getString("name"));
//movie.setThumbnailUrl(obj.getString("image"));
movie.setThumbnailUrl(obj.getString("org_image_url"));
movie.setAverage_ratings(obj.getString("average_ratings"));
movie.setCuisine(obj.getString("cuisine"));
movie.setAddress(obj.getJSONObject("address").getString("area"));
// movie.setAddress(obj.getJSONObject("address").getString("full_address"));
movie.setCost(obj.getString("cost"));
movie.setDistance( obj.getDouble("distance"));
movie.settext(obj.getString("text"));
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
AppController.getInstance().addToRequestQueue(movieReq);
}
#Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
}
I am attaching snapshot of json data. In the snapshot we can see the color "Text=15% discount on bill " i have to access .

try {
String yourresponseString ="";// this string refer to your api response
JSONObject jsonObject = new JSONObject(yourresponseString);
JSONArray objJsonArray = new JSONArray(jsonObject.getString("restaurants"));
for (int i = 0; i < objJsonArray.length(); i++) {
JSONArray objInnerJsonArray = objJsonArray.getJSONObject(i).getJSONArray("restaurant_offers");
for (int j = 0; j < objInnerJsonArray.length(); j++) {
//Here you can acess youe bill discount value
JSONObject objInnerJSONObject = objInnerJsonArray.getJSONObject(j);
System.out.println("Discount==>" + objInnerJSONObject.getString("text"));
}
}
} catch (JSONException e) {
e.printStackTrace();
}
You can parse like this.And using this classes you can parse any type of hierarchy.

JSONArray restaurantsJSONArray= null;
try {
restaurantsJSONArray = response.getJSONArray("restaurants");
} catch (JSONException e) {
e.printStackTrace();
}
hidePDialog();
// Parsing json
for (int i = 0; i < restaurantsJSONArray.length(); i++) {
try {
JSONObject obj =restaurantsJSONArray.getJSONObject(i);
Movie movie = new Movie();
//movie.setTitle(obj.getString("title"));
movie.setName(obj.getString("name"));
JSONArray textJSONArray= obj.getJSONArray("restaurant_offers");
for (int j = 0; j < textJSONArray.length(); j++) {
JSONObject txtobj =textJSONArray.getJSONObject(i);
movie.settext(txtobj .getString("text"));
}
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
try this code restaurant_offers is a JSONArray so you can parse like this

You can parse like this
JSONObject apiResponseJsonObject= // Your API Response
try {
JSONArray restaurantJSONArray = apiResponseJsonObject.getJSONArray("restaurants");
// you can get any text from an object like this
restaurantJSONArray.getJSONObject(index).getString("name");
restaurantJSONArray.getJSONObject(index).getString("cost"); // Like this
//If you want to access phone numbers of specific object
JSONArray phoneJSONArray=restaurantJSONArray.getJSONObject(index).getJSONArray("phone_numbers");
// And you can get specific data from phoneNumber like this
phoneJSONArray.getJSONObject(phoneNumberIndex).getString("number");
//TO get Address, you can use like this
JSONObject addressJSONObject=restaurantJSONArray.getJSONObject(index).getJSONObject("address");
//Like this you can parse whatever you want.
} catch (JSONException e) {
e.printStackTrace();
}

You must change the for loop content like this
JSONObject obj =restaurantsJSONArray.getJSONObject(i);
JSONArray restauranstOffersJSONArray = obj.getJSONArray("restaurants_offers");
for (int i = 0; i < restauranstOffersJSONArray.length(); i++) {
JSONObject offersObj = restauranstOffersJSONArray.get(i);
String text = offersObj.getString("text");
}

How to create ExpandableListview with json data in Android

can anyone suggest that how to create expandable list-view with Json data, i want to parse json data in my expandable list view, plss suggest how can i create

This is exactly what you looking for,you can parse and display data to ExpandableListview
See this : http://www.tutorialsbuzz.com/2015/02/android-expandable-listview-json-http.html
public class MainActivity extends Activity {
String url = "http://api.tutorialsbuzz.com/cricketworldcup2015/cricket.json";
ProgressDialog PD;
private ExpandListAdapter ExpAdapter;
private ExpandableListView ExpandList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ExpandList = (ExpandableListView) findViewById(R.id.exp_list);
PD = new ProgressDialog(this);
PD.setMessage("Loading.....");
PD.setCancelable(false);
makejsonobjreq();
}
private void makejsonobjreq() {
PD.show();
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET, url,
null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
ArrayList<Group> list = new ArrayList<Group>();
ArrayList<Child> ch_list;
try {
Iterator<String> key = response.keys();
while (key.hasNext()) {
String k = key.next();
Group gru = new Group();
gru.setName(k);
ch_list = new ArrayList<Child>();
JSONArray ja = response.getJSONArray(k);
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = ja.getJSONObject(i);
Child ch = new Child();
ch.setName(jo.getString("name"));
ch.setImage(jo.getString("flag"));
ch_list.add(ch);
} // for loop end
gru.setItems(ch_list);
list.add(gru);
} // while loop end
ExpAdapter = new ExpandListAdapter(
MainActivity.this, list);
ExpandList.setAdapter(ExpAdapter);
PD.dismiss();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
PD.dismiss();
}
});
MyApplication.getInstance().addToReqQueue(jsonObjReq, "jreq");
}
}

Android RecyclerView not updating items

I have a RecyclerView on my tabview fragment Activity. iam using arrayList to fill items on the recyclerview. Those JSON data are taken from this URL through volley library.
Here is my code
public class EditorsChoiceFragment extends Fragment {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private static String LOG_TAG = "EditorsChoiceFragment";
private String urlJsonArry = "http://checkthisphone.com/black.apps/get_apps/editor.php";
private ProgressDialog pDialog;
private String jsonResponse;
private static String TAG = EditorsChoiceFragment.class.getSimpleName();
private String appTitle;
private String appDescription;
private JSONArray appDetails=null;
ArrayList<DataObject> results = new ArrayList<DataObject>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.editor_choice_layout, container, false);
makeJsonArrayRequest();
pDialog = new ProgressDialog(getContext());
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
mRecyclerView = (RecyclerView)view.findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(getContext());
mRecyclerView.setLayoutManager(mLayoutManager);
// mAdapter.notifyDataSetChanged();
makeJsonArrayRequest();
mAdapter = new MyRecyclerViewAdapter(results);
mAdapter.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter);
mAdapter.notifyDataSetChanged();
return view;
}
#Override
public void onResume() {
super.onResume();
/*((MyRecyclerViewAdapter) mAdapter).setOnItemClickListener(new MyRecyclerViewAdapter
.MyClickListener() {
#Override
public void onItemClick(int position, View v) {
Log.i(LOG_TAG, " Clicked on Item " + position);
}
});*/
}
private void makeJsonArrayRequest() {
// showpDialog();
JsonArrayRequest req = new JsonArrayRequest(urlJsonArry,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
try {
for (int i = 0; i < response.length(); i++) {
JSONObject person = (JSONObject) response.get(i);
String title = person.getString("title");
String description = person.getString("description");
DataObject obj = new DataObject(title, description);
results.add(i, obj);
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
Log.d(TAG, e.getMessage());
}
hidepDialog();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
hidepDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(req);
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
Log file indicates data coming correctly but recyclerview is not updating. I have used .notifyDataSetChanged(); but still it shows blank. Please me to find the error..

I didn't view your codes each line by line but what I can suggest is refactor these codes as a method like here
public void setAdapter(ArrayList<DataObject> results){
mAdapter = new MyRecyclerViewAdapter(results);
mRecyclerView.setAdapter(mAdapter);
mAdapter.notifyDataSetChanged();
}
Call this in onCreateView once and again call this after retrieving the results that means inside onResponse method like here
try {
for (int i = 0; i < response.length(); i++) {
JSONObject person = (JSONObject) response.get(i);
String title = person.getString("title");
String description = person.getString("description");
DataObject obj = new DataObject(title, description);
results.add(i, obj);
}
}
catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
Log.d(TAG, e.getMessage());
}
//Call method here
setAdapter(results)

Please remove notifyDataSetChanged from the below places.
makeJsonArrayRequest();
mAdapter = new MyRecyclerViewAdapter(results);
mAdapter.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter);
mAdapter.notifyDataSetChanged();
notifyDataSetChanged should be called when you have changed the data in your adapter and want the adapter to know that data has been changes. So in this case you will call it some data added to your results array list.
So once you add data to your results in makeJsonArrayRequest() call
mAdapter.notifyDataSetChanged();
after the for loop.
Also in your adapter constructor make sure you are not creating a new array list and are reusing results as follows.
ArrayList<DataObject> results;
MyRecyclerViewAdapter(results){
this.results = results;
}
Let me know if this works. If it does not please post your adapter code so i can further debug.

You should notify DatasetChanged in onRequestFinished method of volley.
in MainActivity.java
RequestListener listener;
listener = new RequestListener();
volley_queue.addRequestFinishedListener(listener);
RequestListner class
class RequestListener implements RequestQueue.RequestFinishedListener {
#Override
public void onRequestFinished(Request request) {
mAdapter.notifyDataSetChanged();
}
}

try {
for (int i = 0; i < response.length(); i++) {
JSONObject person = (JSONObject) response.get(i);
String title = person.getString("title");
String description = person.getString("description");
DataObject obj = new DataObject(title, description);
results.add(i, obj);
mAdapter.notifyItemInserted(i);
}

try
{
for (int i = 0; i < response.length(); i++)
{
JSONObject person = (JSONObject) response.get(i);
String title = person.getString("title");
String description = person.getString("description");
DataObject obj = new DataObject(title, description);
results.add(i, obj);
}
}
catch (JSONException e)
{
e.printStackTrace();
Toast.makeText(getContext(),"Error: " + e.getMessage(),Toast.LENGTH_LONG).show();
Log.d(TAG, e.getMessage());
}
mAdapter.notifyDataSetChanged();
hidepDialog();

Json Parser with volley library

I was searching a solution but I could not solve it.
thats my JSON
{"Error":"","Filme":[{
"title": "Dawn of the Planet of the Apes",
"image": "http://api.androidhive.info/json/movies/1.jpg",
"rating": 8.3,
"releaseYear": 2014,
"genre": ["Action", "Drama", "Sci-Fi"]
},
{
"title": "District 9",
"image": "http://api.androidhive.info/json/movies/2.jpg",
"rating": 8,
"releaseYear": 2009,
"genre": ["Action", "Sci-Fi", "Thriller"]
},
...
...
}]}
and that's my code
// Movies json url
private static final String url = "https://d....url....";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private HorizontalListView listView;
private CustomListAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (HorizontalListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// changing action bar color
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url ,new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i).getJSONObject(TAG_MOVIE);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
//Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
// adding movie to movies array
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
#Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
but the result is only a white layout. I think it is because my code don't find "Filme" variable in JSON but i don't know how to fix it.
any idea??
Thank you!!

"Filme" is not a JSONObject, it is a JSONArray actually. Simply parse it as a JSONArray :-)
EDIT:
First of all, use a StringRequest, not JSONArray, as the root of what you receive is NOT an JSONArray.
And then, once you have a simple String as a result, do something like this:
JSONObject root = new JSONObject(result);
JSONArray films = root.getJSONArray("Filme");
JSONObject obj;
for (int i = 0; i < films.length(); i++) {
obj = films.getJSONObject(i);
//Put all the parsing for a single Movie JSONObject here
}

Here is the solution that I made with “Kelevandos” help.
Maybe it can help someone.
// Request a string response from the provided URL.
StringRequest movieReq = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
//Log.d(TAG, response.toString());
hidePDialog();
JSONObject root;
try {
root = new JSONObject(response);
JSONArray films = root.getJSONArray("Filme");
JSONObject obj;
for (int i = 0; i < films.length(); i++) {
obj = films.getJSONObject(i);
//Put all the parsing for a single Movie JSONObject here
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
// adding movie to movies array
movieList.add(movie);

passing json data downloaded using volley between activities

i am trying to pass data loaded into my listview with volley.i know how to pass images and text through activities but not json data.It may be a duplicate question but i wasnt helped with the other responses.
Below is my activity code:
public class Movies extends ActionBarActivity{
// Log tag
private static final String TAG = MainActivity.class.getSimpleName();
// Movies json url
private static final String url = "http://api.androidhive.info/json/movies.json";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.event);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Intent newActivity2=new Intent();
setResult(RESULT_OK, newActivity2);
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// changing action bar color
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
// adding movie to movies array
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
if (error instanceof NoConnectionError){
Toast.makeText(getBaseContext(), "Bummer..There's No Internet connection!", Toast.LENGTH_LONG).show();
}};
});
// Adding request to request queue
ParseApplication.getInstance().addToRequestQueue(movieReq);
}
#Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent(Movies.this, Detail.class);
startActivity(intent);
}
});}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
I am supposed to implement this code snippet when passing the param:
intent.putExtra("json",jsonobj.toString());
and on my second activity;
JSONObject obj=new JSONObject(getIntent().getStringExtra("json")
But i dont get what to replace "json",jsonobj.toString() with from my own activity code.please help.
Thanks in advance

i was able to figure it out and passed the title.The image is still underway.I'm jus doing this to help someone who was stuck like me.This will jus give you the clue.
insert this before onCreate():
private static String Title="title";
Then in the onClick()
String name = ((TextView) view.findViewById(R.id.title))
.getText().toString();
Intent intent = new Intent(Movies.this, Detail.class);
intent.putExtra(Title, name);
startActivity(intent);
And in the second activity,retrieve it a such:
Intent i=getIntent();
String name = i.getStringExtra(Title);
TextView lblName = (TextView) findViewById(R.id.name_label);
lblName.setText(name);}
After you have placed the following before onCreate():
private static String Title="title";
Thanks guys for all the help.