Develop Reference

My UI is not updating after API call of openweather

I want to parse JSON from the Openweather API but after many iterations and debugging, my JSON string is not updating, I do not think that there is any problem still the temperatures( minTemperature and maxTemperature) and the name of the place(mPlace) is not set, also I logged the maxtemperature but the console is showing nothing please look into my code.
public class MainActivity extends AppCompatActivity {
private EditText placeText;
private Button enterPlaceButton;
private TextView minTemperature;
private TextView maxTemperature;
private TextView mPlace;
private static final String AppID ="56a5e01eba3af36a7a9b7b210a437d09";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle("Weather");
placeText = findViewById(R.id.myPlaceEditText);
enterPlaceButton = findViewById(R.id.enterPlace);
minTemperature = findViewById(R.id.minTemperature);
maxTemperature = findViewById(R.id.maxTemperature);
mPlace = findViewById(R.id.mPlace);
}
#Override
protected void onResume() {
final URL[] url = {null};
enterPlaceButton.setOnClickListener(v -> {
url[0] = makeUrl(placeText.getText().toString());
placeText.setText("");
});
if (url[0] != null) {
MyAsync myAsync = new MyAsync();
myAsync.execute(url[0]);
}
super.onResume();
}
public URL makeUrl(String place) {
Uri.Builder uriBuilder = new Uri.Builder();
uriBuilder.scheme("http");
uriBuilder.authority("api.openweathermap.org/");
uriBuilder.appendPath("data");
uriBuilder.appendPath("2.5");
uriBuilder.appendPath("weather");
uriBuilder.appendQueryParameter("q",place);
uriBuilder.appendQueryParameter("appid",AppID);
try {
return new URL(uriBuilder.build().toString());
} catch (MalformedURLException e) {
Toast.makeText(MainActivity.this, "Sorry could not able to fetch the Data", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
return null;
}
public class MyAsync extends AsyncTask<URL, Void, String> {
#Override
protected String doInBackground(URL... urls) {
StringBuilder jsonResponseBuilder = new StringBuilder();
try {
HttpURLConnection httpURLConnection = (HttpURLConnection) urls[0].openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setReadTimeout(10000);
httpURLConnection.setConnectTimeout(15000);
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.connect();
if (httpURLConnection.getResponseCode() == 200) {
InputStreamReader inputStreamReader = new InputStreamReader(httpURLConnection.getInputStream());
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String line = bufferedReader.readLine();
while (line != null) {
jsonResponseBuilder.append(line);
line = bufferedReader.readLine();
}
httpURLConnection.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Sorry could not able to fetch the Data", Toast.LENGTH_SHORT).show();
}
Log.d(MyAsync.class.getName(),jsonResponseBuilder.toString());
return jsonResponseBuilder.toString();
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onPostExecute(String s) {
setDataFromJSON(s);
super.onPostExecute(s);
}
public void setDataFromJSON(String s) {
try {
JSONObject jsonObject = new JSONObject(s);
JSONObject getMainObject = jsonObject.getJSONObject("main");
String maxTemp = getMainObject.getString("temp_max");
Log.i(MainActivity.class.getName(), maxTemp);
maxTemperature.setText(maxTemp);
String minTemp = getMainObject.getString("temp_min");
minTemperature.setText(minTemp);
mPlace.setText(jsonObject.getString("name"));
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Sorry could not able to fetch the Data", Toast.LENGTH_SHORT).show();
}
}
}
}

Getting Data from JSON?

I want to get the username from this
Json url.
I have this code but it doesn't let me get the data saying
Json parsing error
Here is the code:
HttpHandler.java
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
private String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "https://someLink";
ArrayList<HashMap<String, String>> contactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.list);
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String name = c.getString("username");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("username", name);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, contactList,
R.layout.list_item, new String[]{"username"}, new int[]{R.id.name});
lv.setAdapter(adapter);
}
}
}
This is an example i found on google and tried to change it a bit in my needs.I've put an empty JsonArray.I also tried other examples but i can't understand what is going wrong.
**
> New question
If my url is like this?What is the difference with the other?
**

You don't have an array to parse in the output. Your URL giving you an Object. Your code should be something like this
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String name = jsonObj.getString("username");
//... now use the whereever you want
}
catch (final JSONException e) {
//... put your error log
}

Please edit your code in MainActivity to get the username from json string as follows :
if(jsonStr!=null)
{
JSONObject jsonObj = new JSONObject(jsonStr);
if(jsonObj !=null)
{
String name = jsonObj .getString("username");
}
}

i suggest you to use this one.
public class HttpGetResources extends AsyncTask<String, Void, Object> {
#SuppressLint("StaticFieldLeak")
private ProgressBar progressBar;
private static final String RAW_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSz";
private String urlString;
private String apiName;
private Class Response_Class;
private static final Gson GSON = new GsonBuilder().setDateFormat(RAW_DATE_FORMAT).create();
private Context context;
public HttpGetResources(Context context,Class Response_Class, String apiName, String urlString) {
this.Response_Class = Response_Class;
this.apiName = apiName;
this.urlString = urlString;
this.context=context;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onPostExecute(Object response) {
super.onPostExecute(response);
}
HttpURLConnection conn = null;
OutputStreamWriter out = null;
Object result = null;
BufferedReader buffer = null;
final ExecutorService executor = Executors.newCachedThreadPool(Executors.defaultThreadFactory());
static public Future<Object> future;
#SuppressWarnings("unchecked")
#Override
protected Object doInBackground(final String... params) {
// JsonObject res=null;
future = executor.submit(new Callable<Object>() {
#Override
public Object call() throws IOException {
try {
URL url = new URL(urlString + apiName);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
conn.setConnectTimeout(3000);
conn.setReadTimeout(15000);
conn.setDoInput(true);
conn.setDoOutput(true);
out = new OutputStreamWriter(conn.getOutputStream());
out.write(params[0]);
out.flush();
out.close(); out=null;
buffer = new BufferedReader(new InputStreamReader(conn.getInputStream()));
// res= GSON.fromJson(buffer, JsonObject.class);
// result = new Gson().fromJson(res.toString(), Response_Class);
result = GSON.fromJson(buffer, Response_Class);
buffer.close(); buffer=null;
// result = new Gson().fromJson(res.toString(), Response_Class);
} catch (Exception e) {
//
} finally {
if (buffer!=null) {
try {
buffer.close();
} catch (Exception e) { //
}
}
if (out != null) {
try {
out.close();
} catch (Exception e) { //
}
}
if (conn != null) {
conn.disconnect();
}
}
return result;
}
});
try {
result = future.get(10, TimeUnit.SECONDS);
} catch (Exception ignored) {
}
return result;
}
}
--and call method--
public synchronized Object HttpGetRes(final Object REQUEST_CLASS, final Class RESPONSE_CLASS, final String
API_NAME, final String URL) {
if(isNetworkAvailable()) {
response = null;
try {
Log.e(API_NAME, "url: " + URL);
Log.e(REQUEST_CLASS.getClass().getSimpleName(), new Gson().toJson(REQUEST_CLASS));
HttpGetResources resource = new HttpGetResources(BaseContext,RESPONSE_CLASS, API_NAME,
URL);
response = resource.execute(new Gson().toJson(REQUEST_CLASS)).get();
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
if (response != null) {
String x = new Gson().toJson(response);
Log.e(RESPONSE_CLASS.getSimpleName(), x);
return response;
} else {
}
}
return null;
}

Try to use GSON library in the future, it will auto convert the JSON object to a java object automatically for you. This will be useful to avoid parsing complex JSON objects or JSON arrays. https://github.com/google/gson

Android using rest api

How to post the data dynamically from the get method to post method
pls, help me to solve this issue.in the url1 I have to store the data
in DB when I used to select the email id the particular physician key
and the email id should be stored in DB
if (jsonString1 != null) {
try {
JSONObject jsonObject1 = new JSONObject(jsonString1);
// Getting JSON Array node
JSONArray contacts1 = jsonObject1.getJSONArray("physicianlist");
for (int i = 0; i < contacts1.length(); i++) {
JSONObject c = contacts1.getJSONObject(i);
String Name = c.getString("Name");
String Physician_Key = c.getString("Physician_Key");
myIntArray[i]=Physician_Key;
String Specialization = c.getString("Specialization");
String ProviderName = c.getString("ProviderName");
String EmailId = c.getString("EmailId");
String Location = c.getString("Location");
HashMap<String, String> phy = new HashMap<>();
// adding each child node to HashMap key => value
phy.put("Name", Name);
phy.put("Physician_Key", Physician_Key);
phy.put("Specialization", Specialization);
phy.put("ProviderName",ProviderName);
phy.put("EmailId",EmailId);
phy.put("Location",Location);
al.add(EmailId);
// adding contact to contact list
phyJsonList.add(phy);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
}); }
} else {Log.e(TAG, "Could not get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Could not get json from server.",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (progressDialog.isShowing())
progressDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter1 = new SimpleAdapter(
MainActivity.this,phyJsonList ,
R.layout.list_item2, new String[]{"Name", "Physician_Key",
"Specialization","ProviderName","EmailId","Location"}, new
int[]{R.id.Name,
R.id.Physician_key,
R.id.Specialization,R.id.ProviderName,R.id.EmailId,R.id.Location});
listView.setAdapter(adapter);
listView1.setAdapter(adapter1);
Utility.setListViewHeightBasedOnChildren(listView);
Utility.setListViewHeightBasedOnChildren(listView1);
}
}
public class SendPostRequest extends AsyncTask<String, Void, String> {
protected void onPreExecute(){}
protected String doInBackground(String... arg0) {
try {
URL url = new URL("https://example.com");
URL url1 = new URL("https://xyz.sharedinfo"); // here is your URL path
final JSONObject postDataParams = new JSONObject();
final JSONObject postDataParams1=new JSONObject();
/* postDataParams.put("name", "abc");
postDataParams.put("email", "abc#gmail.com");*/ //here i have to post the data dynamically
postDataParams1.put("PhysicianKey","55") ;
postDataParams1.put("PatientKey", "5010");
postDataParams.put("Email","john#john.com");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(MainActivity.this, postDataParams.toString(), Toast.LENGTH_SHORT).show();
}
});
Log.e("params",postDataParams.toString());
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
HttpURLConnection conn1 = (HttpURLConnection) url1.openConnection();
conn.setReadTimeout(15000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
conn1.setReadTimeout(15000 /* milliseconds */);
conn1.setConnectTimeout(15000 /* milliseconds */);
conn1.setRequestMethod("POST");
conn1.setDoInput(true);
conn1.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(getPostDataString(postDataParams));
writer.flush();
writer.close();
os.close();
int responseCode=conn.getResponseCode()-1;
// if (responseCode == HttpsURLConnection.HTTP_OK) {
BufferedReader in=new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuffer sb = new StringBuffer("");
String line="";
while((line = in.readLine()) != null) {
sb.append(line);
break;
}
in.close();
return sb.toString();
// }
/* else {
return new String("false : "+responseCode);
}*/
}
catch(Exception e){
return new String("Exception: " + e.getMessage());
}
}
#Override
protected void onPostExecute(String result) {
Toast.makeText(getApplicationContext(), result,
Toast.LENGTH_LONG).show();
}
}
public String getPostDataString(JSONObject params) throws Exception {
StringBuilder result = new StringBuilder();
boolean first = true;
Iterator<String> itr = params.keys();
while(itr.hasNext()){
String key= itr.next();
Object value = params.get(key);
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(key,"UTF-8"));
result.append("=");
result.append(URLEncoder.encode(value.toString(),"UTF-8"));
}
return result.toString();
} }

you can use volley for handle http request
In android studio -put this line in your build.gradle
dependencies{
compile 'com.mcxiaoke.volley:library-aar:1.0.0'
}
Use this method (post) call this method
public void postData(){
StringRequest stringRequest = new StringRequest(Request.Method.POST, "YOUR URL",
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jobject = new JSONObject(response);
Log.e("jobject ", jobject + "<return");
}catch (JSONException je){
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getActivity(),error.toString(),Toast.LENGTH_LONG).show();
}
}){
#Override
protected Map<String,String> getParams(){
Map<String,String> params = new HashMap<String, String>();
params.put("Name","Mr.Lavanya");
params.put("Physician_Key", "Physician_Key");
params.put("ProviderName","ProviderName");
params.put("EmailId","EmailId");
params.put("Location","Location"),
Log.e("params",params+"");
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(stringRequest);
}

Parse json multiple url

I can parse json from a url in this way:
String link1 = "http://www.url.com/test1.json";
String link2 = "http://www.url.com/test2.json";
private void fetchMovies() {
String url = link1;
JsonArrayRequest req = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
if (response.length() > 0) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject movieObj = response.getJSONObject(i);
int rank = movieObj.getInt("rank");
String title = movieObj.getString("title");
Movie m = new Movie(rank, title);
movieList.add(0, m);
} catch (JSONException e) {
}
}
adapter.notifyDataSetChanged();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
});
MyApplication.getInstance().addToRequestQueue(req);
}
I want to parse my json from multiple url.
I want to parse url1 and url2 at the same time.
How can I do that?

I created a class MyAsyncTask, this class receive the URL's list and the context activity. Guide yourself with the sample code.
public class MyAsyncTask extends AsyncTask<Void, Void, List<JSONObject>> {
private Activity activity;
private List<String> urls;
public MyAsyncTask(Activity activity, List<String> urls) {
this.urls = urls;
this.activity = activity;
}
#Override
protected List<JSONObject> doInBackground(Void... voids) {
HttpURLConnection connection = null;
BufferedReader reader = null;
List<JSONObject> jsonURls = new ArrayList<>();
try{
for (String url : urls) {
URL link = new URL(url);
connection = (HttpURLConnection) link.openConnection();
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestMethod("GET");
connection.connect();
reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
String line = null;
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null)
sb.append(line);
reader.close();
JSONObject jsonResult = new JSONObject(sb.toString());
jsonURls.add(jsonResult);
}
} catch (MalformedURLException e) {
e.printStackTrace();
Toast.makeText(activity, "URL error", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(activity, "Connection error", Toast.LENGTH_SHORT).show();
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(activity, "JSON Parsing error", Toast.LENGTH_SHORT).show();
}
return jsonURls;
}
#Override
protected void onPostExecute(List<JSONObject> jsonObjects) {
super.onPostExecute(jsonObjects);
// Process your JSONs
}
}
For to call it, you should do the following (Within your activity):
List<String> urls = new ArrayList<>();
urls.add("https://jsonplaceholder.typicode.com/posts/1");
MyAsyncTask myAsyncTask = new MyAsyncTask(MyActivity.this, urls);
myAsyncTask.execute();
The processing of the JSONs, you must in the PostExecute method.
Don't forget add internet permissions.

you can simple add your urls into the arraylist and parse the urls through a loop.
Arralist<String> arraylist = new Arraylist;
arraylist.add(link1);
arralist.add(link2);
private void fetchMovies() {
int x = arralist.size();
for(int i = 0;i<x;i++)
{ JsonArrayRequest req = new JsonArrayRequest(arralist.get(i),
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
if (response.length() > 0) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject movieObj = response.getJSONObject(i);
int rank = movieObj.getInt("rank");
String title = movieObj.getString("title");
Movie m = new Movie(rank, title);
movieList.add(0, m);
} catch (JSONException e) {
}
}
adapter.notifyDataSetChanged();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
});
MyApplication.getInstance().addToRequestQueue(req);
}}

How to parse JSON dat with HTTP Post method in android studio

JSONParser.class
package com.example.diptiagravat.myapplication;
public class JSONParser {
public String getJSON(String url, int timeout) {
HttpURLConnection c = null;
try {
URL u = new URL(url);
c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setRequestProperty("Content-length", "0");
c.setUseCaches(false);
c.setAllowUserInteraction(false);
c.setConnectTimeout(timeout);
c.setReadTimeout(timeout);
c.connect();
int status = c.getResponseCode();
switch (status) {
case 200:
case 201:
BufferedReader br = new BufferedReader(new InputStreamReader(c.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
br.close();
return sb.toString();
}
} catch (MalformedURLException ex) {
Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
} finally {
if (c != null) {
try {
c.disconnect();
} catch (Exception ex) {
Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
}
}
}
return null;
}
public String sendHTTPData(String urlpath, String id) {
HttpURLConnection connection = null;
try {
URL url=new URL(urlpath);
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("Accept", "application/json");
OutputStreamWriter streamWriter = new OutputStreamWriter(connection.getOutputStream());
streamWriter.write(id);
streamWriter.flush();
StringBuilder stringBuilder = new StringBuilder();
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK){
InputStreamReader streamReader = new InputStreamReader(connection.getInputStream());
BufferedReader bufferedReader = new BufferedReader(streamReader);
String response = null;
while ((response = bufferedReader.readLine()) != null) {
stringBuilder.append(response + "\n");
}
bufferedReader.close();
Log.d("test", stringBuilder.toString());
return stringBuilder.toString();
} else {
Log.e("test", connection.getResponseMessage());
return null;
}
} catch (Exception exception){
Log.e("test", exception.toString());
return null;
} finally {
if (connection != null){
connection.disconnect();
}
}
}
}
MainActivity.java
package com.example.diptiagravat.myapplication;
public class MainActivity extends AppCompatActivity {
private TextView txtid, txtcname;
Spinner spcnt, spstate;
public ArrayList<String> clist;
ArrayAdapter<String> cad;
public ArrayList<String> slist;
ArrayAdapter<String> sad;
public String strcnt;
private static String url = "http://urmiinfotech.com/demo/ifirst/app_api/get_country_list.php";
private static String stateUrl = "http://urmiinfotech.com/demo/ifirst/app_api/get_state_list.php";
private static final String TAG_USER = "country";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "country_name";
private ArrayList<Country> clistModels;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
CountryAsyncTask countryAsyncTask= new CountryAsyncTask();
countryAsyncTask.execute();
}
private void initViews() {
txtid = (TextView) findViewById(R.id.tvid);
txtcname = (TextView) findViewById(R.id.tvcname);
spcnt = (Spinner) findViewById(R.id.spcnt);
spstate = (Spinner) findViewById(R.id.spstate);
clist = new ArrayList<String>();
slist = new ArrayList<String>();
}
public class CountryAsyncTask extends AsyncTask<Void, Void, String> {
#Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = null;
try {
json = new JSONObject(jParser.getJSON(url, 5000));
} catch (JSONException e) {
e.printStackTrace();
}
return json.toString();
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
Log.i("Result Ravi", result);
try {
JSONObject obj = new JSONObject(result);
JSONArray cntArray = obj.getJSONArray("country");
if (cntArray.length() > 0) {
for (int i = 0; i < cntArray.length(); i++) {
final JSONObject temp = cntArray.getJSONObject(i);
// txtid.setText(temp.getString("id"));
// txtcname.setText(temp.getString("country_name"));
Country country = new Gson().fromJson(temp.toString(), Country.class);
clist = new ArrayList<String>();
clistModels = new ArrayList<Country>();
clistModels.add(new Country(temp.optString("id"), temp.optString("country_name"), "", null));
clist.add(temp.getString("country_name"));
cad = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, clist);
spcnt.setAdapter(cad);
spcnt.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
strcnt = clistModels.get(position).getId();
//strcnt = parent.getItemAtPosition(position).toString();
Log.i("id", strcnt);
new StatesAsyncTask().execute();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
// txtid.setText(temp.getString(country.getId()));
// txtcname.setText(temp.getString(country.getCountryName()));
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public class StatesAsyncTask extends AsyncTask<Void, Void, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(Void... params) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = null;
try {
json = new JSONObject(jParser.sendHTTPData(stateUrl, strcnt));
} catch (JSONException e) {
e.printStackTrace();
}
return json.toString();
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
try {
JSONObject obj = new JSONObject(s);
JSONArray stArray = obj.getJSONArray("statelist");
if (stArray.length() > 0) {
for (int i = 0; i < stArray.length(); i++) {
final JSONObject temp = stArray.getJSONObject(i);
// txtid.setText(temp.getString("id"));
// txtcname.setText(temp.getString("country_name"));
Statelist stlist = new Gson().fromJson(temp.toString(), Statelist.class);
slist = new ArrayList<String>();
// clistModels = new ArrayList<Country>();
//clistModels.add(new Country(temp.optString("id"), temp.optString("country_name"), "", null));
slist.add(temp.getString("state_name"));
sad = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, slist);
spstate.setAdapter(sad);
spstate.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// strcnt = clistModels.get(position).getId();
//strcnt = parent.getItemAtPosition(position).toString();
// Log.i("id", strcnt);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
// txtid.setText(temp.getString(country.getId()));
// txtcname.setText(temp.getString(country.getCountryName()));
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
My response is null?

HttpURLConnection is deprecated in Android Lollipop, so please try to use DefaultHttpClient instead. Also, check your logs, this is at your onPostExecute():
Log.i("Result Ravi", result);
For DefaultHttpClient check this post.
Another way is to try Retrofit