How to send a JSON object over Request with Android

Question

I want to send  the following JSON text     Email   aaa tbbb com   Password   123456     to a web service and read the response  I know to how to read JSON  The problem is that the above JSON object must be sent in a variable name jason    How can I do this from android  What are the steps such as creating request object  setting content headers  etc

User · Answer

Sending a json object from Android is easy if you use Apache HTTP Client. Here's a code sample on how to do it. You should create a new thread for network activities so as not to lock up the UI thread.

    protected void sendJson(final String email, final String pwd) {
        Thread t = new Thread() {

            public void run() {
                Looper.prepare(); //For Preparing Message Pool for the child Thread
                HttpClient client = new DefaultHttpClient();
                HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit
                HttpResponse response;
                JSONObject json = new JSONObject();

                try {
                    HttpPost post = new HttpPost(URL);
                    json.put("email", email);
                    json.put("password", pwd);
                    StringEntity se = new StringEntity( json.toString());  
                    se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
                    post.setEntity(se);
                    response = client.execute(post);

                    /*Checking response */
                    if(response!=null){
                        InputStream in = response.getEntity().getContent(); //Get the data in the entity
                    }

                } catch(Exception e) {
                    e.printStackTrace();
                    createDialog("Error", "Cannot Estabilish Connection");
                }

                Looper.loop(); //Loop in the message queue
            }
        };

        t.start();      
    }

You could also use Google Gson to send and retrieve JSON.

User · Answer

Android doesn t have special code for sending and receiving HTTP  you can use standard Java code  I d recommend using the Apache HTTP client  which comes with Android  Here s a snippet of code I used to send an HTTP POST   I don t understand what sending the object in a variable named  jason  has to do with anything  If you re not sure what exactly the server wants  consider writing a test program to send various strings to the server until you know what format it needs to be in   int TIMEOUT MILLISEC   10000        10 seconds String postMessage         HERE YOUR POST STRING  HttpParams httpParams   new BasicHttpParams    HttpConnectionParams setConnectionTimeout httpParams  TIMEOUT MILLISEC   HttpConnectionParams setSoTimeout httpParams  TIMEOUT MILLISEC   HttpClient client   new DefaultHttpClient httpParams    HttpPost request   new HttpPost serverUrl   request setEntity new ByteArrayEntity      postMessage toString   getBytes  UTF8      HttpResponse response   client execute request

User · Answer

Now since the HttpClient is deprecated the current working code is to use the HttpUrlConnection to create the connection and write the and read from the connection  But I preferred to use the Volley  This library is from android AOSP  I found very easy to use to make JsonObjectRequest or JsonArrayRequest

User · Answer

HttpPost is deprecated by Android Api Level 22  So  Use HttpUrlConnection for further   public static String makeRequest String uri  String json        HttpURLConnection urlConnection      String url      String data   json      String result   null      try             Connect          urlConnection    HttpURLConnection    new URL uri  openConnection              urlConnection setDoOutput true           urlConnection setRequestProperty  Content-Type    application json            urlConnection setRequestProperty  Accept    application json            urlConnection setRequestMethod  POST            urlConnection connect               Write         OutputStream outputStream   urlConnection getOutputStream            BufferedWriter writer   new BufferedWriter new OutputStreamWriter outputStream   UTF-8             writer write data           writer close            outputStream close               Read         BufferedReader bufferedReader   new BufferedReader new InputStreamReader urlConnection getInputStream     UTF-8              String line   null          StringBuilder sb   new StringBuilder             while   line   bufferedReader readLine       null                sb append line                      bufferedReader close            result   sb toString           catch  UnsupportedEncodingException e            e printStackTrace          catch  IOException e            e printStackTrace              return result

User · Answer

public void postData String url JSONObject obj           Create a new HttpClient and Post Header      HttpParams myParams   new BasicHttpParams        HttpConnectionParams setConnectionTimeout myParams  10000       HttpConnectionParams setSoTimeout myParams  10000       HttpClient httpclient   new DefaultHttpClient myParams        String json obj toString         try            HttpPost httppost   new HttpPost url toString             httppost setHeader  Content-type    application json             StringEntity se   new StringEntity obj toString              se setContentEncoding new BasicHeader HTTP CONTENT TYPE   application json             httppost setEntity se             HttpResponse response   httpclient execute httppost           String temp   EntityUtils toString response getEntity             Log i  tag   temp           catch  ClientProtocolException e           catch  IOException e

User · Answer

There s a surprisingly nice library for Android HTTP available at the link below   http   loopj com android-async-http   Simple requests are very easy   AsyncHttpClient client   new AsyncHttpClient    client get  http   www google com   new AsyncHttpResponseHandler          Override     public void onSuccess String response            System out println response               To send JSON  credit to  voidberg  at https   github com loopj android-async-http issues 125       params is a JSONObject StringEntity se   null  try       se   new StringEntity params toString       catch  UnsupportedEncodingException e           handle exceptions properly    se setContentType new BasicHeader HTTP CONTENT TYPE   application json      client post null   www example com objects   se   application json   responseHandler     It s all asynchronous  works well with Android and safe to call from your UI thread  The responseHandler will run on the same thread you created it from  typically  your UI thread   It even has a built-in resonseHandler for JSON  but I prefer to use google gson

User · Answer

public class getUserProfile extends AsyncTask lt Void  String  JSONArray gt        JSONArray array       Override     protected JSONArray doInBackground Void    params             try               commonurl cu   new commonurl                String u   cu geturl  tempshowusermain php                URL url  new URL u                 URL url   new URL  http   192 168 225 35 jabber tempshowusermain php                HttpURLConnection httpURLConnection    HttpURLConnection  url openConnection                httpURLConnection setRequestMethod  POST                httpURLConnection setRequestProperty  Content-Type    application json                httpURLConnection setRequestProperty  Accept    application json                httpURLConnection setDoOutput true               httpURLConnection setRequestProperty  Connection    Keep-Alive                httpURLConnection setDoInput true               httpURLConnection connect                 JSONObject jsonObject new JSONObject                jsonObject put  lid  lid                 DataOutputStream outputStream   new DataOutputStream httpURLConnection getOutputStream                 outputStream write jsonObject toString   getBytes  UTF-8                  int code   httpURLConnection getResponseCode                if  code    200                    BufferedReader bufferedReader   new BufferedReader new InputStreamReader httpURLConnection getInputStream                       StringBuffer stringBuffer   new StringBuffer                    String line                   while   line   bufferedReader readLine       null                        stringBuffer append line                                     object    new JSONObject stringBuffer toString                       array   new JSONArray stringBuffer toString                     array   object getJSONArray  response                              catch  Exception e                 e printStackTrace                      return array                Override     protected void onPreExecute             super onPreExecute                   Override     protected void onPostExecute JSONArray array            super onPostExecute array           try               for  int x   0  x  lt  array length    x                       object   array getJSONObject x                   ComonUserView commUserView new ComonUserView       commonclass setId Integer parseInt jsonObject2 getString  pid   toString                        pidArray add jsonObject2 getString  pid   toString                      commUserView setLid object get  lid   toString                     commUserView setUname object get  uname   toString                     commUserView setAboutme object get  aboutme   toString                     commUserView setHeight object get  height   toString                     commUserView setAge object get  age   toString                     commUserView setWeight object get  weight   toString                     commUserView setBodytype object get  bodytype   toString                     commUserView setRelationshipstatus object get  relationshipstatus   toString                     commUserView setImagepath object get  imagepath   toString                     commUserView setDistance object get  distance   toString                     commUserView setLookingfor object get  lookingfor   toString                     commUserView setStatus object get  status   toString                      cm add commUserView                             custuserprof   new customadapterformainprofile getActivity   cm Tab3 this             gridusername setAdapter custuserprof                   listusername setAdapter custuserprof                 catch  Exception e                     e printStackTrace

User · Answer

Nothing could be simple than this  Use OkHttpLibrary  Create your json   JSONObject requestObject   new JSONObject    requestObject put  Email   email   requestObject put  Password   password     and send it like this   OkHttpClient client   new OkHttpClient     RequestBody body   RequestBody create JSON  json   Request request   new Request Builder                addHeader  Content-Type   application json                url url               post requestObject toString                 build     okhttp3 Response response   client newCall request  execute

[android] How to send a JSON object over Request with Android?

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