Get JSON Data from URL Using Android

Question

I am trying to get JSON data by parsing login url with username and password  I have tried by using below code but I can t get any responses  Please help me   I am using HTTP Process and API level 23   I need to parse my URL and get below Response          response                     Team   A                    Name   Sonu                    Class   First                                     Result   Good       Below My code    public class LoginActivity extends Activity        JSONParser jsonparser   new JSONParser        TextView tv      String ab      JSONObject jobj   null       Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout login            new retrievedata   execute                class retrievedata extends AsyncTask lt String  String  String gt             Override         protected String doInBackground String    arg0                   TODO Auto-generated method stub             jobj   jsonparser makeHttpRequest  http   myurlhere com                    check your log for json response             Log d  Login attempt   jobj toString                  try                   ab   jobj getString  title                  catch  JSONException e                       TODO Auto-generated catch block                 e printStackTrace                              return ab                    protected void onPostExecute String ab                tv setText ab

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BufferedReader reader   new BufferedReader new InputStreamReader response getEntity   getContent     UTF-8     String sResponse  StringBuilder s   new StringBuilder     while   sResponse   reader readLine       null        s   s append sResponse     Gson gson   new Gson     JSONObject jsonObject   new JSONObject s toString     String link   jsonObject getString  Result

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Don t know about android but in POJ I use  public final class MyJSONObject extends JSONObject       public MyJSONObject URL url  throws IOException           super getServerData url              static String getServerData URL url  throws IOException           HttpURLConnection con    HttpURLConnection  url openConnection            BufferedReader ir   new BufferedReader new InputStreamReader con getInputStream              String text   ir lines   collect Collectors joining   n             return  text

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private class GetProfileRequestAsyncTasks extends AsyncTask lt String  Void  JSONObject gt          Override     protected void onPreExecute                  Override     protected JSONObject doInBackground String    urls            if  urls length  gt  0                String url   urls 0               HttpClient httpClient   new DefaultHttpClient                HttpGet httpget   new HttpGet url               httpget setHeader  x-li-format    json                try                   HttpResponse response   httpClient execute httpget                   if  response    null                          If status is OK 200                     if  response getStatusLine   getStatusCode      200                            String result   EntityUtils toString response getEntity                               Convert the string result to a JSON Object                         return new JSONObject result                                                         catch  IOException e                   catch  JSONException e                                    return null             Override     protected void onPostExecute JSONObject data            if  data    null                Log d TAG  String valueOf data

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Easy way to get JSON especially for Android SDK 23   public class MainActivity extends AppCompatActivity    Button btnHit  TextView txtJson  ProgressDialog pd    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main        btnHit    Button  findViewById R id btnHit       txtJson    TextView  findViewById R id tvJsonItem        btnHit setOnClickListener new View OnClickListener              Override         public void onClick View v                new JsonTask   execute  Url address here                            private class JsonTask extends AsyncTask lt String  String  String gt         protected void onPreExecute             super onPreExecute             pd   new ProgressDialog MainActivity this           pd setMessage  Please wait            pd setCancelable false           pd show               protected String doInBackground String    params              HttpURLConnection connection   null          BufferedReader reader   null           try               URL url   new URL params 0                connection    HttpURLConnection  url openConnection                connection connect                  InputStream stream   connection getInputStream                 reader   new BufferedReader new InputStreamReader stream                 StringBuffer buffer   new StringBuffer                String line                    while   line   reader readLine       null                    buffer append line   n                    Log d  Response       gt      line       here u ll get whole response        -                               return buffer toString                catch  MalformedURLException e                e printStackTrace              catch  IOException e                e printStackTrace              finally               if  connection    null                    connection disconnect                              try                   if  reader    null                        reader close                                    catch  IOException e                    e printStackTrace                                    return null              Override     protected void onPostExecute String result            super onPostExecute result           if  pd isShowing                 pd dismiss                      txtJson setText result

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I feel your frustration   Android is crazy fragmented  and the the sheer amount of different examples on the web when searching is not helping   That said  I just completed a sample partly based on mustafasevgi sample  partly built from several other stackoverflow answers  I try to achieve this functionality  in the most simplistic way possible  I feel this is close to the goal    Mind you  code should be easy to read and tweak  so it does not fit your json object perfectly  but should be super easy to edit  to fit any scenario   protected class yourDataTask extends AsyncTask lt Void  Void  JSONObject gt         Override     protected JSONObject doInBackground Void    params                 String str  http   your domain here yourSubMethod           URLConnection urlConn   null          BufferedReader bufferedReader   null          try                       URL url   new URL str               urlConn   url openConnection                bufferedReader   new BufferedReader new InputStreamReader urlConn getInputStream                   StringBuffer stringBuffer   new StringBuffer                String line              while   line   bufferedReader readLine       null                                stringBuffer append line                              return new JSONObject stringBuffer toString                       catch Exception ex                        Log e  App    yourDataTask   ex               return null                    finally                       if bufferedReader    null                                try                       bufferedReader close                      catch  IOException e                        e printStackTrace                                                          Override     protected void onPostExecute JSONObject response                if response    null                        try                   Log e  App    Success      response getString  yourJsonElement                    catch  JSONException ex                    Log e  App    Failure   ex                                     This would be the json object it is targeted towards          yourJsonElement   Hi  I m a string        anotherElement   Ohh  why didn t you pick me      It is working on my end  hope this is helpful to someone else out there

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Here in this snippet  we will see a volley method  add below dependency in-app level gradle file   compile  com android volley volley 1 1 1  -  adding volley dependency  implementation  com google code gson gson 2 8 5  -  adding gson for JSON data manipulation in android    Dummy URL -  https   jsonplaceholder typicode com users  HTTP GET Method Request   public void getdata        Response Listener lt String gt  response listener   new Response Listener lt String gt               Override         public void onResponse String response                Log e  Response  response               try                   JSONArray jsonArray   new JSONArray response                   JSONObject jsonObject   jsonArray getJSONObject 0  getJSONObject  address   getJSONObject  geo                    Log e  lat  jsonObject getString  lat                    Log e  lng  jsonObject getString  lng                  catch  JSONException e                    e printStackTrace                                         Response ErrorListener response error listener   new Response ErrorListener              Override         public void onErrorResponse VolleyError error                if  error instanceof TimeoutError    error instanceof NoConnectionError                      TODO               else if  error instanceof AuthFailureError                      TODO               else if  error instanceof ServerError                      TODO               else if  error instanceof NetworkError                      TODO               else if  error instanceof ParseError                      TODO                                     StringRequest stringRequest   new StringRequest Request Method GET   https   jsonplaceholder typicode com users  response listener response error listener       getRequestQueue   add stringRequest         public RequestQueue getRequestQueue           requestQueue is used to stack your request and handles your cache      if  mRequestQueue    null            mRequestQueue   Volley newRequestQueue getApplicationContext               return mRequestQueue      Visit https   github com JainaTrivedi AndroidSnippet- blob master Snippets VolleyActivity java

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My fairly short code to read JSON from an URL   requires Guava due to usage of CharStreams         private static class VersionTask extends AsyncTask lt String  String  String gt             Override         protected String doInBackground String    strings                String result   null              URL url              HttpURLConnection connection   null              try                   url   new URL  https   api github com repos user name repo name releases latest                    connection    HttpURLConnection  url openConnection                    connection connect                    result   CharStreams toString new InputStreamReader connection getInputStream    Charsets UTF 8                  catch  IOException e                    Log d  VersionTask   Log getStackTraceString e                  finally                   if  connection    null                        connection disconnect                                                return result                      Override         protected void onPostExecute String result                super onPostExecute result               if  result    null                    String version                       try                       version   new JSONObject result  optString  tag name   trim                      catch  JSONException e                        Log e  VersionTask   Log getStackTraceString e                                      if  version startsWith  v                            process version                                                   PS  This code gets the latest release version  based on tag name  for a given GitHub repo

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If you get the server response as a String  without using a third party library you can do   JSONObject json   new JSONObject response   JSONObject jsonResponse   json getJSONObject  response    String team   jsonResponse getString  Team      Here is the documentation  Otherwise to parse json you can use Gson or Jackson  EDIT without libraries  not tested   class retrievedata extends AsyncTask lt Void  Void  String gt        Override     protected String doInBackground Void    params             HttpURLConnection urlConnection   null          BufferedReader reader   null           URL url          try               url   new URL  http   myurlhere com                urlConnection setRequestMethod  GET      Your method here              urlConnection connect                 InputStream inputStream   urlConnection getInputStream                StringBuffer buffer   new StringBuffer                if  inputStream    null                    return null                            reader   new BufferedReader new InputStreamReader inputStream                 String line              while   line   reader readLine       null                  buffer append line     n                 if  buffer length      0                  return null               return buffer toString              catch  IOException e                Log e TAG   IO Exception   e               exception   e              return null            finally               if  urlConnection    null                    urlConnection disconnect                              if  reader    null                    try                       reader close                      catch  final IOException e                        exception   e                      Log e TAG   Error closing stream   e                                                         Override     protected void onPostExecute String response            if response    null                JSONObject json   new JSONObject response               JSONObject jsonResponse   json getJSONObject  response                String team   jsonResponse getString  Team

[android] Get JSON Data from URL Using Android?

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