Develop Reference

Not able to fetch JSON data from api of covid19india for my android app using Volley

I want to fetch data from this file: https://api.covid19india.org/state_district_wise.json
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading data...");
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.GET,
"https://api.covid19india.org/state_district_wise.json",
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.getJSONArray("Jammu and Kashmir");
progressDialog.cancel();
for(int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
// I want get case details of "Jammu and Kashmir"
}
} catch (Exception e) {
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
//
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
What should I use here:
JSONArray jsonArray = jsonObject.getJSONArray("Jammu and Kashmir");

Data comming from API is JSONArray, not JSONObject
JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, "https://api.covid19india.org/v2/state_district_wise.json",null,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
try {
for (int i = 0; i < response.length(); i++) {
JSONObject dataOBJ = response.getJSONObject(i);
JSONArray jsonChild = dataOBJ.getJSONArray("districtData");
for (int k = 0; k < jsonChild.length(); k++) {
JSONObject obj = jsonChild.getJSONObject(k);
// work to be done...
}
}
} catch (Exception exp) {
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(request);
The code is working fine now. Read this for complete sollution.

How do I return a Hashmap inside a JSONArray response?

I want to access email and phone in HashMap from outside of the JSONArray Response. How can I do this?
I tried making globale variables and assign values to them. It didn't worked.
JsonArrayRequest request1 = new JsonArrayRequest(Request.Method.GET,
url,
null,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
List<HashMap<String, String>> list = new ArrayList<>();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
HashMap<String, String> map = new HashMap();
map.put("email", obj.getString("email"));
map.put("phone", obj.getString("phone"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(HomeActivity.this, "Error"+error, Toast.LENGTH_SHORT).show();
}
});

Declare HashMap<String, String> map = new HashMap(); at top level in your class
And use it in your JsonArrayRequest
#Override
public void onResponse(JSONArray response) {
List<HashMap<String, String>> list = new ArrayList<>();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
map.put("email", obj.getString("email"));
map.put("phone", obj.getString("phone"));
} catch (Exception e) {
e.printStackTrace();
}
}
}

Android - java adding please wait message

My question is how can i add a message "Loading please wait " . Until the request is made and response is parsed to table.
Is there approach to that using this method ?
Like this when i run this i don't know if there is no data on response or response is not yet received.
StringRequest postRequest = new StringRequest(Request.Method.POST, apiURL,
new Response.Listener<String>()
{
#Override
public void onResponse(String response) {
try {
JSONObject jsonObj = new JSONObject(response);
JSONArray jsonArray = jsonObj.getJSONArray("sales");
for (int i=0;i<jsonArray.length();i++){
JSONObject employee = jsonArray.getJSONObject(i);
TableRow tbrow = new TableRow( MainActivity.this );
TextView t1v = new TextView(MainActivity.this);
t1v.setText(employee.getString("saletype"));
t1v.setTextColor(Color.BLACK);
stk.addView(tbrow);
// .......
}
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener()
{
#Override
public void onErrorResponse(VolleyError error) {
}
}
) {
#Override
protected Map<String, String> getParams()
{
Map<String, String> params = new HashMap<String, String>();
Spinner spinner = (Spinner) findViewById(R.id.spinner);
params.put("store", spinner.getSelectedItem().toString());
return params;
}
};
mQueue.add(postRequest);

Show Progress bar on adding request object in queue.
mQueue.add(postrequest);
progressDialog = new ProgressDialog(getActivity());
progressDialog.setMessage("Loading ...Please Wait");
progressDialog.show();
Then Dismiss it on receiving response.
try {
JSONObject jsonObj = new JSONObject(response);
JSONArray jsonArray = jsonObj.getJSONArray("sales");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject employee = jsonArray.getJSONObject(i);
TableRow tbrow = new TableRow(MainActivity.this);
TextView t1v = new TextView(MainActivity.this);
t1v.setText(employee.getString("saletype"));
t1v.setTextColor(Color.BLACK);
stk.addView(tbrow);
// .......
}
progressDialog.dismiss();
} catch (Exception e) {
progressDialog.dismiss();
}
Also,
#Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
}

How to update json data using volley method on Android?

I get the error no value for city.
I'm new to Android. I was unable to pass the spinner data using PHP URL, volley method. And in my XML I'm using the spinner and text views city, id and pass the city list through spinner URL.
Here is my activity:
private void spinnerapi(){
sprCoun = (Spinner) findViewById(R.id.spinner);
RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
String serverURL = "server url";
final StringRequest getRequest = new StringRequest(Request.Method.POST, serverURL,
new com.android.volley.Response.Listener<String>() {
#Override
public void onResponse(String response) {
Log.d("officerResponse", response);
try {
JSONObject jsonObject = new JSONObject(response);
String str_status = jsonObject.getString("status");
String str_message = jsonObject.getString("message");
JSONArray jsonArray = jsonObject.getJSONArray("data");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObjectGuest = jsonArray.getJSONObject(i);
city_name = jsonObjectGuest.getString("cityname");
city_id = jsonObjectGuest.getString("cityid");
listarraylist.add(new CityModel(city_name));
}
sprCoun.setAdapter(new ArrayAdapter<String>
(RegistrationActivity.this, android.R.layout.simple_spinner_dropdown_item, list));
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), "" + e, Toast.LENGTH_LONG).show();
}
}
},
new com.android.volley.Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
// error
// Toast.makeText(context, "" + error, Toast.LENGTH_LONG).show();
Log.d("tyghj", String.valueOf(error));
}
}
) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
return params;
}
};
queue.add(getRequest);
}

How to Get String from JSON Array [duplicate]

This question already has answers here:
JSON Array of strings (no objects), extracting data
(4 answers)
Closed 6 years ago.
its actually a simple code, cuz of lack of basic I still cant manage to handle this.
After I made a Post JSON Method on my own Api, I get the following response
[{"id":"2"}]
What I'm trying to achieve is that I would like to get the value of this "id" which is "2".
I've tried the following code in my private void method
private void getUserID() {
StringRequest stringRequest = new StringRequest(Method.POST,Constants.GET_USER_ID,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Toast.makeText(MainActivity.this, response, Toast.LENGTH_LONG).show();
try {
JSONObject jsonRootObject = new JSONObject(strJson);
//Get the instance of JSONArray that contains JSONObjects
JSONArray jsonArray = jsonRootObject.optJSONArray("");
//Iterate the jsonArray and print the info of JSONObjects
for(int i=0; i < jsonArray.length(); i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
int id = Integer.parseInt(jsonObject.optString("id").toString());
String idUser = jsonObject.optString("id").toString();
}
output.setText(idUser);
} catch (JSONException e) {e.printStackTrace();}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, error.toString(), Toast.LENGTH_LONG).show();
}
})
{
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> map = new HashMap<>();
map.put(Constants.KEY_A, username);
map.put(Constants.KEY_B, password);
return map;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
I get it from here.
It's a bit of waste, because I only have one list object in my array, and I thinks for loop is not really important in here.

replace your try block with following
try {
JSONArray jsonArray = new JSONArray(response);
JSONObject jsonObject = jsonArray.getJSONObject(0);
String idUser = jsonObject.getString("id");
Log.e("id is: ", idUser);
}

Try this way you will get
private void makeJsonArrayRequest() {
showpDialog();
JsonArrayRequest req = new JsonArrayRequest( delprourl,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d("ress", response.toString());
// Parsing json
try {
for (int i = 0; i < response.length(); i++) {
JSONObject person = (JSONObject) response
.get(i);
System.out.println("person" + person);
//get your id here
String id = person.getString("id");
Log.e("id: ", id);
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
hidepDialog();
// 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("ErrorVolley", "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
hidepDialog();
}
});
MyApplication.getInstance().addToReqQueue(req, "jreq");
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}