Develop Reference

How parse JSON data into ListView

I would like to visualize the Json data on a listview, but I don't know how to do it ... I tried to use a TextView to verify the correct passage of the data and it seems to work, but I would need to display them on the listView ... ideas?
{"Esito":true,"Dati":[{"id":"357","id_utente":"16","nome_prodotto":"cozze"},{"id":"358","id_utente":"16","nome_prodotto":"riso"},{"id":"362","id_utente":"16","nome_prodotto":"patate"},{"id":"366","id_utente":"16","nome_prodotto":"cozze"},{"id":"367","id_utente":"16","nome_prodotto":null}]}
JsonObjectRequest request = new JsonObjectRequest(Request.Method.G[enter image description here][1]ET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("Dati");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject dato = jsonArray.getJSONObject(i);
String id = dato.getString("id");
String id_utente = dato.getString("id_utente");
String nome_prodotto = dato.getString("nome_prodotto");
mTextViewResult.append(id + ", " + id_utente + ", " + nome_prodotto + "\n\n");
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}

Just make new object class and collect data to list :
class YourObiekt {
private String id;
private String idUtente;
private String nomeProdotto;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getIdUtente() {
return idUtente;
}
public void setIdUtente(String idUtente) {
this.idUtente = idUtente;
}
public String getNomeProdotto() {
return nomeProdotto;
}
public void setNomeProdotto(String nomeProdotto) {
this.nomeProdotto = nomeProdotto;
}
}
List<YourObiekt> yourObiektList = new ArrayList<YourObiekt>();
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("Dati");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject dato = jsonArray.getJSONObject(i);
YourObiekt yo = new YourObiekt();
yo.setId(dato.getString("id"));
yo.setIdUtente(dato.getString("id_utente"));
yo.setNomeProdotto(dato.getString("nome_prodotto"));
yourObiektList.add(yo);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
And now you get yourObiektList as data for your listView

Volley does not work correctly when URL has UTF-8 on Android version less than 5

I use the volley library in my app, and I accidentally realized that my String URL for Android less than 5, the response from the server is empty, But in the higher version the answer is correct, So I checked My URL, Which is as follows:
string url ====> http://www.articler.ir/android_php/search.php?Method=rate&CAT=مهندسی%20عمران
Part of this has a character of UTF-8, Why this URL returns the correct response in higher versions of Android (5+). But the response is empty in the lower versions(5-)?
Please help me, thank You...
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
final ListView listView = findViewById(R.id.test);
final CustomListAdapter adapter = new CustomListAdapter(this, myList);
Intent intent = getIntent();
FirstURL = intent.getStringExtra("SearchURL");
SearchURL = FirstURL.replaceAll(" ", "%20");
Log.d("Search", "Search: " + SearchURL);
myList.removeAll(myList);
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(SearchURL, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Toast.makeText(TestActivity.this, "", Toast.LENGTH_SHORT).show();
Log.d("VolleyRes", "response: " + response);
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jsonObject = response.getJSONObject(i);
Model model = new Model();
model.setTitle(jsonObject.getString("title"));
model.setMainText(jsonObject.getString("mainText"));
model.setrate(jsonObject.getDouble("rate"));
model.setYear(jsonObject.getInt("year"));
model.setConfName(jsonObject.getString("confName"));
model.setProductId(jsonObject.getInt("productId"));
model.setCountView(jsonObject.getInt("countView"));
model.setPdfURL(jsonObject.getString("pdfURL"));
// authors is json array
authors = new ArrayList<String>();
JSONArray authorArray = jsonObject.getJSONArray("authors");
for (int j = 0; j < authorArray.length(); j++) {
if (!authors.contains(authorArray.getString(j)) && !authorArray.isNull(j)) {
authors.add((String) authorArray.get(j));
}
}
model.setAuthor(authors);
// Keywords is json array
keywords = new ArrayList<String>();
JSONArray keywordArray = jsonObject.getJSONArray("Keywords");
for (int k = 0; k < keywordArray.length(); k++) {
if (!keywords.contains(keywordArray.getString(k)) && !keywordArray.isNull(k)) {
keywords.add((String) keywordArray.get(k));
}
}
model.setKeywords(keywords);
myList.add(model);
} catch (JSONException e) {
e.printStackTrace();
}
}
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("VolleyErr", "ErrorMassage: " + error.getMessage());
}
});
AppController.getInstance().addToRequestQueue(jsonArrayRequest);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int year = myList.get(position).getYear();
int productId = myList.get(position).getProductId();
int countView = myList.get(position).getCountView();
double rate = myList.get(position).getrate();
String title = myList.get(position).getTitle();
String mainText = myList.get(position).getMainText();
String confName = myList.get(position).getConfName();
ArrayList authors = myList.get(position).getAuthor();
ArrayList keywords = myList.get(position).getKeywords();
String pdfURL = myList.get(position).getPdfURL();
SharedPreferences prefs = PreferenceManager.
getDefaultSharedPreferences(getApplicationContext());
SharedPreferences.Editor editor = prefs.edit();
editor.putInt("productId", productId); //InputString: from the EditText
editor.putInt("countView", countView);
editor.putFloat("rate", (float) rate);
editor.putString("pdfURL",pdfURL);
editor.putString("title",title);
editor.putString("mainText",mainText);
editor.putString("confName",confName);
editor.putString("authors", String.valueOf(authors));
editor.putString("keywords", String.valueOf(keywords));
editor.putInt("year", year);
editor.commit();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent intent = new Intent(getApplicationContext(),DetailActivity.class);
startActivity(intent);
// finish();
}
}, 1500);
}
});
}
}

After a lot of searches, I realized that URL with Persian fonts on Android less than 5 is not supported. So I need to change the string by encoding it so I used the method below to change it.
//this is initial string url ====> http://www.articler.ir/android_php/search.php?Method=rate&CAT=مهندسی%20عمران
String MyKey = مهندسی عمران;
final String EncodeKey= URLEncoder.encode(MyKey , "UTF-8");
String EncodeURL = " http://www.articler.ir/android_php/search.php?Method=rate&CAT= " + EncodeKey;
after changing this part, my response is correct, like 5+ version;

how to access an element of an JSON array

Given below is my JSON and I want to access "trips" JSON array and want to place it in an array list so that I can use it in a spinner. How can I access trips JSON array directly and use as a ArrayList for spinner?
My JSON:
{
"trips": [
77
],
"status": {
"message": "Successfully fetched the Open trips ",
"code": 200
}
}
My Activity class:
public class MainActivity extends AppCompatActivity implements Spinner.OnItemSelectedListener {
private Spinner spinner;
private ArrayList<String> trips;
private JSONArray result;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
trips= new ArrayList<String>();
this.spinner = (Spinner) findViewById(R.id.spinner);
spinner.setOnItemSelectedListener(this);
loadtrip();
}
public void loadtrip() {
HashMap<String,String> params=new HashMap<String,String>();
{
params.put("systemId", "12");
params.put("customerId", "3513");
params.put("userId", "124");
params.put("tripType", "Open");
}
JsonObjectRequest stringRequest = new JsonObjectRequest(Request.Method.POST,config.DATA_URL, new JSONObject(params),
new Response.Listener<JSONObject>() {
public void onResponse(JSONObject response) {
try {
result = response.getJSONArray(config.JSON_ARRAY);
} catch (JSONException e) {
e.printStackTrace();
}
spinner.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item,trips));
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) ;
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String item = parent.getItemAtPosition(position).toString();
Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView<?> parent) {
}
}

You can get value from json array directly from its index.
JSONArray array = yourJsonObject.getJSONArray("trips");
for (int i=0; i<array.length(); i++) {
int value = array.getInt(i);
}

JSONArray array = yourJsonObject.getJSONArray("trips");
for (int i=0; i<array.length(); i++)
{
int value = array.getInt(i);
}
JSONObject objStates = yourJsonObject.getJSONObject(“status”);
String msg= objStates.getString(“message”)
Int code= objStates.getInt(“code”)

Try something like
try {
result = response.getJSONArray("trips");
for(int i = 0; i < result.length(); i++){
trips.add(String.valueOf(result.getInt(i)));
}
} catch (JSONException e) {
e.printStackTrace();
}

Declare int value; and parse JSON:
new Response.Listener<JSONObject>() {
public void onResponse(JSONObject response) {
try {
result = response.getJSONArray("trips");
for (int i=0; i<result.length(); i++) {
value = result.getInt(i);
trips.add(String.valueOf(value));
}
} catch (JSONException e) {
e.printStackTrace();
}
spinner.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item,trips));

As you are using config.JSON_ARRAY key to parse in your code, what is the value for config.JSON_ARRAY. If config.JSON_ARRAY="trips" then fine and replace static "trips" key with yours config.JSON_ARRAY else follow mine static key to parse.
Just update your code with this one: In this I parsed the trips JSON array and added all the items to the trips ArrayList.
public class MainActivity extends AppCompatActivity implements Spinner.OnItemSelectedListener {
private Spinner spinner;
private ArrayList<String> trips;
private JSONArray result;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
trips= new ArrayList<String>();
this.spinner = (Spinner) findViewById(R.id.spinner);
spinner.setOnItemSelectedListener(this);
loadtrip();
}
public void loadtrip() {
trips = new ArrayList<>();
HashMap<String,String> params=new HashMap<String,String>();
{
params.put("systemId", "12");
params.put("customerId", "3513");
params.put("userId", "124");
params.put("tripType", "Open");
}
JsonObjectRequest stringRequest = new JsonObjectRequest(Request.Method.POST,config.DATA_URL, new JSONObject(params),
new Response.Listener<JSONObject>() {
public void onResponse(JSONObject response) {
try {
result = response.optJSONArray("trips");
for(int i = 0; i < result.length(); i++){
trips.add(String.valueOf(result.getInt(i)));
}
} catch (JSONException e) {
e.printStackTrace();
}
spinner.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item,trips));
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) ;
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String item = parent.getItemAtPosition(position).toString();
Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView<?> parent) {
}
}

Try this it works for me.
JSONObject object = jObj.getJSONObject(result);
Iterator<?> iterator = object.keys();
while (iterator.hasNext()) {
String key = (String) iterator.next();
ArrayList<JSONObject> value = new ArrayList<>();
JSONArray jsonArray = object.getJSONArray(key);
for (int i = 0; i < jsonArray.length(); i++) {
value.add(jsonArray.getJSONObject(i));
}
System.out.println("key : " + key + " " + "value : " + value);
hm.put(key, value);
}

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");
}

I am getting Error like below in android using volley.error is , org.json.JSONException: Index 3 out of range [0..3)

I am using volley library to achive network operation when i try to ru the program using below program i am gettin warning and getting size less than what i have in the url the warning message is org.json.JSONException: Index 3 out of range [0..3).
public class MainActivity extends AppCompatActivity {
TextView results;
String JsonURL = "http://184.73.181.186/jsondata.php";
String data = "";
RequestQueue requestQueue;
MyCustomBaseAdapter myCustomBaseAdapter;
ArrayList<StudentInfo> studentInfoList = new ArrayList<StudentInfo>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
requestQueue = Volley.newRequestQueue(this);
results = (TextView) findViewById(R.id.jsonData);
JsonArrayRequest arrayreq = new JsonArrayRequest(JsonURL,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
try {
for(int i=0;i<lenghthofarray;i++){
JSONObject jresponse = response.getJSONObject(i);
final int numberOfItemsInResp = jresponse.length();
StudentInfo studentInfo = new StudentInfo();
String fname = jresponse.getString("fName");
String lName = jresponse.getString("lName");
String rollNo = jresponse.getString("rollNo");
String profilePic = jresponse.getString("profilePic");
studentInfo.setFname(fname);
studentInfo.setLname(lName);
studentInfo.setRoolNo(rollNo);
studentInfo.setStudpic(profilePic);
studentInfoList.add(studentInfo);
list.add(profilePic);
myCustomBaseAdapter = new MyCustomBaseAdapter(getApplicationContext(),studentInfoList);
JSONObject colorObj = response.getJSONObject(0);
JSONArray colorArry = colorObj.getJSONArray("marks");
for (int ii = 0; ii < colorArry.length(); ii++) {
JSONObject jsonObject = colorArry.getJSONObject(i);
String subjectName, marks;
subjectName = jsonObject.getString("subjectName");
marks = jsonObject.getString("marks");
}
data += "\nfName " + fname +
"\nHex Value : " + lName + "\n\n\n"+rollNo+"\n"+profilePic+"\n";
}
results.setText(data);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
// Handles errors that occur due to Volley
public void onErrorResponse(VolleyError error) {
Log.e("Volley", "Error");
}
}
);
}
}

The problem is in(i),replace i with ii
JSONObject jsonObject = colorArry.getJSONObject(i);
solved one
JSONObject jsonObject = colorArry.getJSONObject(ii);