Sending POST data in Android

Question

I m experienced with PHP  JavaScript and a lot of other scripting languages  but I don t have a lot of experience with Java or Android   I m looking for a way to send POST data to a PHP script and display the result

User · Answer

This is an example of how to POST multi-part data WITHOUT using external Apache libraries   byte   buffer   getBuffer     if buffer length  gt  0       String lineEnd     r n       String twoHyphens    --       String boundary     RQdzAAihJq7Xp1kjraqf        ByteArrayOutputStream baos   new ByteArrayOutputStream       DataOutputStream dos   new DataOutputStream baos          Send parameter  1    dos writeBytes twoHyphens   boundary   lineEnd       dos writeBytes  Content-Disposition  form-data  name   param1      lineEnd      dos writeBytes  Content-Type  text plain  charset US-ASCII    lineEnd      dos writeBytes  Content-Transfer-Encoding  8bit    lineEnd      dos writeBytes lineEnd      dos writeBytes myStringData   lineEnd          Send parameter  2      dos writeBytes twoHyphens   boundary   lineEnd         dos writeBytes  Content-Disposition  form-data  name   param2      lineEnd   lineEnd        dos writeBytes  foo2    lineEnd          Send a binary file    dos writeBytes twoHyphens   boundary   lineEnd       dos writeBytes  Content-Disposition  form-data  name   param3   filename   test file dat      lineEnd       dos writeBytes  Content-Type  application octet-stream    lineEnd      dos writeBytes  Content-Transfer-Encoding  binary    lineEnd      dos writeBytes lineEnd       dos write buffer      dos writeBytes lineEnd       dos writeBytes twoHyphens   boundary   twoHyphens   lineEnd       dos flush        dos close        ByteArrayInputStream content   new ByteArrayInputStream baos toByteArray        BasicHttpEntity entity   new BasicHttpEntity       entity setContent content       HttpPost httpPost   new HttpPost myURL      httpPost addHeader  Connection    Keep-Alive       httpPost addHeader  Content-Type    multipart form-data  boundary   boundary         MultipartEntity entity   new MultipartEntity         entity addPart  param3   new ByteArrayBody buffer   test file dat          entity addPart  param1   new StringBody myStringData        httpPost setEntity entity             String httpData          ByteArrayOutputStream baos1   new ByteArrayOutputStream       entity writeTo baos1      httpData   baos1 toString  UTF-8                    Header   hdrs   httpPost getAllHeaders       for Header hdr  hdrs         httpData    hdr getName             hdr getValue                               Log e TAG   httpPost data      httpData      response   httpClient execute httpPost

User · Answer

You can POST an HttpRequest using WebServer class and track the response in its listener interface   WebServer server new WebServer getApplicationContext      server setOnServerStatusListner new WebServer OnServerStatusListner          Override     public void onServerResponded String responce                 Override     public void onServerRevoked                  Now create a DataRack to bind your data  List lt DataRack gt  racks new ArrayList lt DataRack gt     racks add new DataRack  name   Simon     racks add new DataRack  age   40     racks add new DataRack  location   Canada       Now simply send the POST request with that rack  server connectWithPOST MainActivity this  http   sangeethnandakumar esy es PROJECTS PUBLIC SERVICE posttest php  racks     You need to include my library for this  Documentations here

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You can use the following to send an HTTP-POST request to a URL and receive the response  I always use this  try       AsyncHttpClient client   new AsyncHttpClient           Http Request Params Object     RequestParams params   new RequestParams        String u    quot B2mGaME quot       String au    quot gamewrapperB2M quot          String mob    quot 880xxxxxxxxxx quot       params put  quot usr quot   u toString         params put  quot aut quot   au toString         params put  quot uph quot   MobileNo toString             params put  quot uph quot   mob toString         client post  quot http   196 6 13 01 88 ws game wrapper reg check php quot   params  new AsyncHttpResponseHandler              Override         public void onSuccess String response                playStatus   response                    Get your Response                  Log i getClass   getSimpleName     quot Response SP Status   quot    playStatus                      Override         public void onFailure Throwable throwable                super onFailure throwable                       catch  Exception e        e printStackTrace       You Also need to Add bellow Jar file in libs folder android-async-http-1 3 1 jar  Finally  I have edit your build gradle  dependencies       compile files  libs  lt android-async-http-1 3 1 jar gt       In the last Rebuild your project

User · Answer

I found this helpful example with this video tutorial      Connector Class    package com tutorials hp mysqlinsert  import java io IOException  import java net HttpURLConnection  import java net MalformedURLException  import java net URL         Created by Oclemmy on 3 31 2016 for ProgrammingWizards Channel      public class Connector           1 SHALL HELP US ESTABLISH A CONNECTION TO THE NETWORK  2  WE ARE MAKING A POST REQUEST          public static HttpURLConnection connect String urlAddress            try                       URL url new URL urlAddress               HttpURLConnection con   HttpURLConnection  url openConnection                  SET PROPERTIES             con setRequestMethod  POST                con setConnectTimeout 20000               con setReadTimeout 20000               con setDoInput true               con setDoOutput true                 RETURN             return con            catch  MalformedURLException e                e printStackTrace              catch  IOException e                e printStackTrace                      return null                  DataPackager Class    package com tutorials hp mysqlinsert  import org json JSONException  import org json JSONObject  import java io UnsupportedEncodingException  import java net URLEncoder  import java util Iterator         Created by Oclemmy on 3 31 2016 for ProgrammingWizards Channel     1 BASICALLY PACKS DATA WE WANNA SEND     public class DataPackager       String name position team             SECTION 1 RECEIVE ALL DATA WE WANNA SEND             public DataPackager String name  String position  String team            this name   name          this position   position          this team   team                  SECTION 2    1 PACK THEM INTO A JSON OBJECT    2  READ ALL THIS DATA AND ENCODE IT INTO A FROMAT THAT CAN BE SENT VIA NETWORK            public String packData                 JSONObject jo new JSONObject            StringBuffer packedData new StringBuffer            try                       jo put  Name  name               jo put  Position  position               jo put  Team  team               Boolean firstValue true              Iterator it jo keys                do                   String key it next   toString                    String value jo get key  toString                    if firstValue                                        firstValue false                   else                                       packedData append   amp                                       packedData append URLEncoder encode key  UTF-8                     packedData append                       packedData append URLEncoder encode value  UTF-8                  while  it hasNext                 return packedData toString              catch  JSONException e                e printStackTrace              catch  UnsupportedEncodingException e                e printStackTrace                      return null                     Sender Class    package com tutorials hp mysqlinsert  import android app ProgressDialog  import android content Context  import android os AsyncTask  import android widget EditText  import android widget Toast  import java io BufferedReader  import java io BufferedWriter  import java io IOException  import java io InputStreamReader  import java io OutputStream  import java io OutputStreamWriter  import java net HttpURLConnection         Created by Oclemmy on 3 31 2016 for ProgrammingWizards Channel and Camposha com     1 SEND DATA FROM EDITTEXT OVER THE NETWORK    2 DO IT IN BACKGROUND THREAD    3 READ RESPONSE FROM A SERVER     public class Sender extends AsyncTask lt Void Void String gt        Context c      String urlAddress      EditText nameTxt posTxt teamTxt      String name pos team      ProgressDialog pd                     1 OUR CONSTRUCTOR     2 RECEIVE CONTEXT URL ADDRESS AND EDITTEXTS FROM OUR MAINACTIVITY            public Sender Context c  String urlAddress EditText   editTexts            this c   c          this urlAddress   urlAddress            INPUT EDITTEXTS         this nameTxt editTexts 0           this posTxt editTexts 1           this teamTxt editTexts 2             GET TEXTS FROM EDITEXTS         name nameTxt getText   toString            pos posTxt getText   toString            team teamTxt getText   toString                    1 SHOW PROGRESS DIALOG WHILE DOWNLOADING DATA             Override     protected void onPreExecute             super onPreExecute            pd new ProgressDialog c           pd setTitle  Send            pd setMessage  Sending  Please wait            pd show                     1 WHERE WE SEND DATA TO NETWORK     2 RETURNS FOR US A STRING              Override     protected String doInBackground Void    params            return this send                   1  CALLED WHEN JOB IS OVER   2  WE DISMISS OUR PD   3 RECEIVE A STRING FROM DOINBACKGROUND            Override     protected void onPostExecute String response            super onPostExecute response           pd dismiss            if response    null                          SUCCESS             Toast makeText c response Toast LENGTH LONG  show                nameTxt setText                  posTxt setText                  teamTxt setText               else                         NO SUCCESS             Toast makeText c  Unsuccessful   response Toast LENGTH LONG  show                       SEND DATA OVER THE NETWORK RECEIVE AND RETURN A RESPONSE         private String send                   CONNECT         HttpURLConnection con Connector connect urlAddress           if con  null                        return null                    try                       OutputStream os con getOutputStream                  WRITE             BufferedWriter bw new BufferedWriter new OutputStreamWriter os  UTF-8                 bw write new DataPackager name pos team  packData                 bw flush                  RELEASE RES             bw close                os close                  HAS IT BEEN SUCCESSFUL              int responseCode con getResponseCode                if responseCode  con HTTP OK                                  GET EXACT RESPONSE                 BufferedReader br new BufferedReader new InputStreamReader con getInputStream                      StringBuffer response new StringBuffer                    String line                    READ LINE BY LINE                 while   line br readLine       null                                        response append line                                       RELEASE RES                 br close                    return response toString                 else                                       catch  IOException e                e printStackTrace                      return null                 MainActivity    package com tutorials hp mysqlinsert  import android os Bundle  import android support v7 app AppCompatActivity  import android support v7 widget Toolbar  import android view View  import android widget Button  import android widget EditText     1 OUR LAUNCHER ACTIVITY 2 INITIALIZE SOME UI STUFF 3 WE START SENDER ON BUTTON CLICK     public class MainActivity extends AppCompatActivity       String urlAddress  http   10 0 2 2 android poster php       EditText nameTxt posTxt teamTxt      Button saveBtn       Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           Toolbar toolbar    Toolbar  findViewById R id toolbar           setSupportActionBar toolbar             INITIALIZE UI FIELDS         nameTxt   EditText  findViewById R id nameEditTxt           posTxt   EditText  findViewById R id posEditTxt           teamTxt   EditText  findViewById R id teamEditTxt           saveBtn   Button  findViewById R id saveBtn           saveBtn setOnClickListener new View OnClickListener                  Override             public void onClick View v                      START ASYNC TASK                 Sender s new Sender MainActivity this urlAddress nameTxt posTxt teamTxt                   s execute                                           ContentMain xml     lt RelativeLayout xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      xmlns tools  http   schemas android com tools      android layout width  match parent      android layout height  match parent      android paddingBottom   dimen activity vertical margin      android paddingLeft   dimen activity horizontal margin      android paddingRight   dimen activity horizontal margin      android paddingTop   dimen activity vertical margin      app layout behavior   string appbar scrolling view behavior      tools context  com tutorials hp mysqlinsert MainActivity      tools showIn   layout activity main  gt       lt TextView         android layout width  wrap content          android layout height  wrap content          android text  Hello World     gt       lt LinearLayout         android layout width  fill parent          android layout height  match parent          android layout marginTop   attr actionBarSize          android orientation  vertical          android paddingLeft  15dp          android paddingRight  15dp          android paddingTop  50dp  gt           lt android support design widget TextInputLayout             android id    id nameLayout              android layout width  match parent              android layout height  wrap content  gt               lt EditText                 android id    id nameEditTxt                  android layout width  match parent                  android layout height  wrap content                  android singleLine  true                  android hint   Name    gt           lt  android support design widget TextInputLayout gt           lt android support design widget TextInputLayout             android id    id teamLayout              android layout width  match parent              android layout height  wrap content  gt               lt EditText                 android id    id teamEditTxt                  android layout width  match parent                  android layout height  wrap content                  android hint  Description    gt           lt  android support design widget TextInputLayout gt           lt android support design widget TextInputLayout             android id    id posLayout              android layout width  match parent              android layout height  wrap content  gt               lt EditText                 android id    id posEditTxt                  android layout width  match parent                  android layout height  wrap content                  android hint  Position    gt               lt  --android inputType  textPassword -- gt           lt  android support design widget TextInputLayout gt           lt Button android id    id saveBtn              android layout width  fill parent              android layout height  wrap content              android text  Save              android clickable  true              android background   color colorAccent              android layout marginTop  40dp              android textColor   android color white   gt       lt  LinearLayout gt   lt  RelativeLayout gt

User · Answer

For me works next     private sendData          JSONObject jsonObject   new JSONObject         jsonObject accumulate  key1   value1        jsonObject accumulate  key2   value2         boolean success   sendPost SERVER URL     v1 auth   jsonObject        private boolean sendPost String url  JSONObject parameters            boolean requestResult   false          InputStream inputStream   null          String result               try                HttpClient httpclient   new DefaultHttpClient                HttpPost httpPost   new HttpPost url                String json                    json   parameters toString                 StringEntity se   new StringEntity json               httpPost setEntity se                httpPost setHeader  Accept    application json                httpPost setHeader  Content-type    application json                 HttpResponse httpResponse   httpclient execute httpPost                inputStream   httpResponse getEntity   getContent                 if  inputStream    null                    result   convertInputStreamToString inputStream                   requestResult   true                else                   result    Did not work                    requestResult   false                            System out println result             catch  Exception e                Log d  InputStream   e getLocalizedMessage                 requestResult   false                    return requestResult

User · Answer

Better use Apache Commons HttpClient  that is also included in android already  Have a look at  Android Developer  Apache HTTP Client Package Summary for general api info

User · Answer

You can use URLConnection with setDoOutput true   getOutputStream    for sending data   and getInputStream    for receiving     Sun has an example for exactly this

User · Answer

Use the open source okHttp library from Square  okHttp works from Android 2 3 and up and has an Apache 2 0 license on GitHub   Sending POST data is as simple as adding the following in an AsyncTask   OkHttpClient client   new OkHttpClient    RequestBody formBody   new FormBody Builder                          add  email   emailString     A sample POST field                        add  comment   commentString     Another sample POST field                        build    Request request   new Request Builder                     url  https   yourdomain org callback php      The URL to send the data to                   post formBody                    build      okHttp also has a namespace on maven  so adding it to your Android Studio project is simple  Just add compile  com squareup okhttp3 okhttp 3 11 0  to your app s build gradle   Complete Code  Add the following to your activity   public class CallAPI extends AsyncTask lt String  String  String gt         String emailString      String commentString       public CallAPI String email  String commnt              emailString   email             commentString   commnt              Override     protected void onPreExecute             super onPreExecute                Override     protected String doInBackground String    params            OkHttpClient client   new OkHttpClient            RequestBody formBody   new FormBody Builder                          add  email   emailString     A sample POST field                        add  comment   commentString     Another sample POST field                        build            Request request   new Request Builder                     url  https   yourdomain org callback php      The URL to send the data to                   post formBody                    build            return                 Override     protected void onPostExecute String s            super onPostExecute s             And call it using   new CallAPI emailString  commentString  execute

User · Answer

In newer versions of Android you have to put all web I O requests into a new thread  AsyncTask works best for small requests

User · Answer

Note  Oct 2020   AsyncTask used in the following answer has been deprecated in Android API level 30  Please refer to Official documentation or this blog post for a more updated example Updated  June 2017  Answer which works on Android 6 0   Thanks to  Rohit Suthar   Tamis Bolvari and  sudhiskr for the comments      public class CallAPI extends AsyncTask lt String  String  String gt                 public CallAPI                  set context variables if required                         Override         protected void onPreExecute                 super onPreExecute                             Override          protected String doInBackground String    params                String urlString   params 0      URL to call             String data   params 1     data to post             OutputStream out   null               try                   URL url   new URL urlString                   HttpURLConnection urlConnection    HttpURLConnection  url openConnection                    out   new BufferedOutputStream urlConnection getOutputStream                      BufferedWriter writer   new BufferedWriter new OutputStreamWriter out   quot UTF-8 quot                     writer write data                   writer flush                    writer close                    out close                     urlConnection connect                  catch  Exception e                    System out println e getMessage                                    References   https   developer android com reference java net HttpURLConnection html How to add parameters to HttpURLConnection using POST using NameValuePair  Original Answer  May 2010  Note  This solution is outdated  It only works on Android devices up to 5 1  Android 6 0 and above do not include the Apache http client used in this answer  Http Client from Apache Commons is the way to go  It is already included in android  Here s a simple example of how to do HTTP Post using it  public void postData            Create a new HttpClient and Post Header     HttpClient httpclient   new DefaultHttpClient        HttpPost httppost   new HttpPost  quot http   www yoursite com script php quot         try              Add your data         List lt NameValuePair gt  nameValuePairs   new ArrayList lt NameValuePair gt  2           nameValuePairs add new BasicNameValuePair  quot id quot    quot 12345 quot             nameValuePairs add new BasicNameValuePair  quot stringdata quot    quot Hi quot             httppost setEntity new UrlEncodedFormEntity nameValuePairs                Execute HTTP Post Request         HttpResponse response   httpclient execute httppost                  catch  ClientProtocolException e               TODO Auto-generated catch block       catch  IOException e               TODO Auto-generated catch block

User · Answer

If you just want to append data to the Url You can do so by using HttpUrlConnection since HttpClient is now deprecated  A better way would be to use a library like-  Volley  Retrofit   We can post data to the php script and fetch result and display it by using this code performed Through AsyncTask class       private class LongOperation  extends AsyncTask lt String  Void  Void gt            Required initialization       private String Content      private String Error   null      private ProgressDialog Dialog   new ProgressDialog Login this       String data          int sizeData   0         protected void onPreExecute                NOTE  You can call UI Element here             Start Progress Dialog  Message           Dialog setMessage  Please wait              Dialog show            Dialog setCancelable false           Dialog setCanceledOnTouchOutside false            try                 Set Request parameter             data     amp     URLEncoder encode  username    UTF-8         edittext getText                 catch  UnsupportedEncodingException e                   TODO Auto-generated catch block             e printStackTrace                             Call after onPreExecute method     protected Void doInBackground String    urls                           Make Post Call To Web Server                      BufferedReader reader null              Send data         try                           Defined URL  where to send data             URL url   new URL urls 0                    Send POST data request              URLConnection conn   url openConnection                 conn setConnectTimeout 5000    define connection timeout              conn setReadTimeout 5000    define read timeout             conn setDoOutput true               OutputStreamWriter wr   new OutputStreamWriter conn getOutputStream                 wr write  data                wr flush                    Get the server response              reader   new BufferedReader new InputStreamReader conn getInputStream                  StringBuilder sb   new StringBuilder                String line   null                    Read Server Response             while  line   reader readLine       null                                   Append server response in string                 sb append line                                       Append Server Response To Content String             Content   sb toString                        catch Exception ex                        Error   ex getMessage                      finally                       try                                reader close                               catch Exception ex                         return null             protected void onPostExecute Void unused               NOTE  You can call UI Element here              Close progress dialog         Dialog dismiss             if  Error    null                     Toast makeText getApplicationContext    Error encountered  Toast LENGTH LONG  show                         else                   try                    JSONObject jsonRootObject   new JSONObject Content                     JSONObject json2  jsonRootObject getJSONObject  jsonkey     pass jsonkey here                   String id  json2 optString  id   toString     parse json to string through parameters          the result is stored in string id  you can display it now                 catch  JSONException e   e printStackTrace                             But using libraries such as volley or retrofit is much better option because Asynctask class and HttpurlConnection is slower compared to libraries  Also the library will fetch everything and is faster as well

User · Answer

Method to post data as HTTP request   public static InputStream callPostService String Url          List lt NameValuePair gt  data        HttpClient httpclient   new DefaultHttpClient        HttpPost httppost   new HttpPost Url       try           httppost setEntity new UrlEncodedFormEntity data            HttpResponse response   httpclient execute httppost           HttpEntity entity   response getEntity            return entity getContent          catch  ClientProtocolException e            e printStackTrace          catch  IOException e            e printStackTrace              return null

User · Answer

for Android     5  The org apache http classes and the AndroidHttpClient class have been deprecated in Android 5 1  These classes are no longer being maintained and you should migrate any app code using these APIs to the URLConnection classes as soon as possible   https   developer android com about versions android-5 1 html http  Thought of sharing my code using HttpUrlConnection   public String  performPostCall String requestURL          HashMap lt String  String gt  postDataParams         URL url      String response           try           url   new URL requestURL            HttpURLConnection conn    HttpURLConnection  url openConnection            conn setReadTimeout 15000           conn setConnectTimeout 15000           conn setRequestMethod  GET            conn setDoInput true           conn 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             if  responseCode    HttpsURLConnection HTTP OK                String line              BufferedReader br new BufferedReader new InputStreamReader conn getInputStream                  while   line br readLine       null                    response  line                                  else               response                          catch  Exception e            e printStackTrace               return response           private String getPostDataString HashMap lt String  String gt  params  throws UnsupportedEncodingException          StringBuilder result   new StringBuilder            boolean first   true          for Map Entry lt String  String gt  entry   params entrySet                 if  first                  first   false              else                 result append   amp                  result append URLEncoder encode entry getKey     UTF-8                 result append                   result append URLEncoder encode entry getValue     UTF-8                        return result toString              also you can Post method    conn setRequestMethod  POST        Update 21 02 2016  for post request with json   see this example    public class Empty extends         AsyncTask lt Void  Void  Boolean gt         String urlString    http   www yoursite com         private final String TAG    post json example       private Context context       private int advertisementId       public Empty Context contex  int advertisementId             this context   contex          this advertisementId   advertisementId              Override     protected void onPreExecute             Log e TAG   1 - RequestVoteTask is about to start                    Override     protected Boolean doInBackground Void    params            boolean status   false           String response               Log e TAG   2 - pre Request to response                try               response   performPostCall urlString  new HashMap lt String  String gt                               private static final long serialVersionUID   1L                                                         put  Accept    application json                                put  Content-Type    application json                                                                  Log e TAG   3 - give Response                   Log e TAG   4     response toString               catch  Exception e                   displayLoding false                Log e TAG   Error                          Log e TAG   5 - after Response                if   response equalsIgnoreCase                    try                   Log e TAG   6 - response  empty                                          JSONObject jRoot   new JSONObject response                   JSONObject d   jRoot getJSONObject  d                     int ResultType   d getInt  ResultType                    Log e  ResultType   ResultType                         if  ResultType    1                         status   true                                    catch  JSONException e                       displayLoding false                      e printStackTrace                    Log e TAG   Error     e getMessage                   finally                            else               Log e TAG   6 - response is empty                    status   false                     return status              Override     protected void onPostExecute Boolean result                       Log e TAG   7 - onPostExecute                 if  result                Log e TAG   8 - Update UI                        setUpdateUI adv             else               Log e TAG   8 - Finish                        displayLoding false                  finish                          public String performPostCall String requestURL                                    HashMap lt String  String gt  postDataParams             URL url          String response               try               url   new URL requestURL                HttpURLConnection conn    HttpURLConnection  url openConnection                conn setReadTimeout context getResources   getInteger                      R integer maximum timeout to server                conn setConnectTimeout context getResources   getInteger                      R integer maximum timeout to server                conn setRequestMethod  POST                conn setDoInput true               conn setDoOutput true                conn setRequestProperty  Content-Type    application json                 Log e TAG   11 - url       requestURL                                  JSON                              JSONObject root   new JSONObject                               String token   Static getPrefsToken context                root put  securityInfo   Static getSecurityInfo context                root put  advertisementId   advertisementId                Log e TAG   12 - root       root toString                  String str   root toString                byte   outputBytes   str getBytes  UTF-8                OutputStream os   conn getOutputStream                os write outputBytes                int responseCode   conn getResponseCode                 Log e TAG   13 - responseCode       responseCode                if  responseCode    HttpsURLConnection HTTP OK                    Log e TAG   14 - HTTP OK                     String line                  BufferedReader br   new BufferedReader new InputStreamReader                          conn getInputStream                      while   line   br readLine       null                        response    line                                  else                   Log e TAG   14 - False - HTTP OK                    response                               catch  Exception e                e printStackTrace                       return response              UPDATE 24 08 2016  Use some best library   such as     Retrofit Volley   because     Avoid HttpUrlConnection and HttpClient   On lower API levels  mostly on Gingerbread and Froyo   HttpUrlConnection and HttpClient are far from being perfect   And Avoid AsyncTask Too They are Much Faster They Caches Everything   Since the introduction of Honeycomb  API 11   it s been mandatory to perform network operations on a separate thread  different from the main thread

User · Answer

By this way we can send data with http post method and get result       public class MyHttpPostProjectActivity extends Activity implements OnClickListener        private EditText usernameEditText      private EditText passwordEditText      private Button sendPostReqButton      private Button clearButton           Called when the activity is first created          Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout login            usernameEditText    EditText  findViewById R id login username editText           passwordEditText    EditText  findViewById R id login password editText            sendPostReqButton    Button  findViewById R id login sendPostReq button           sendPostReqButton setOnClickListener this            clearButton    Button  findViewById R id login clear button           clearButton setOnClickListener this                       Override     public void onClick View v             if v getId      R id login clear button               usernameEditText setText                  passwordEditText setText                  passwordEditText setCursorVisible false               passwordEditText setFocusable false               usernameEditText setCursorVisible true               passwordEditText setFocusable true            else if v getId      R id login sendPostReq button               String givenUsername   usernameEditText getEditableText   toString                String givenPassword   passwordEditText getEditableText   toString                 System out println  Given username      givenUsername     Given password      givenPassword                sendPostRequest givenUsername  givenPassword                           private void sendPostRequest String givenUsername  String givenPassword             class SendPostReqAsyncTask extends AsyncTask lt String  Void  String gt                 Override             protected String doInBackground String    params                     String paramUsername   params 0                   String paramPassword   params 1                    System out println      doInBackground    paramUsername     paramUsername     paramPassword      paramPassword                    HttpClient httpClient   new DefaultHttpClient                        In a POST request  we don t pass the values in the URL                    Therefore we use only the web page URL as the parameter of the HttpPost argument                 HttpPost httpPost   new HttpPost  http   www nirmana lk hec android postLogin php                        Because we are not passing values over the URL  we should have a mechanism to pass the values that can be                   uniquely separate by the other end                    To achieve that we use BasicNameValuePair                                Things we need to pass with the POST request                 BasicNameValuePair usernameBasicNameValuePair   new BasicNameValuePair  paramUsername   paramUsername                   BasicNameValuePair passwordBasicNameValuePAir   new BasicNameValuePair  paramPassword   paramPassword                       We add the content that we want to pass with the POST request to as name-value pairs                   Now we put those sending details to an ArrayList with type safe of NameValuePair                 List lt NameValuePair gt  nameValuePairList   new ArrayList lt NameValuePair gt                     nameValuePairList add usernameBasicNameValuePair                   nameValuePairList add passwordBasicNameValuePAir                    try                          UrlEncodedFormEntity is an entity composed of a list of url-encoded pairs                         This is typically useful while sending an HTTP POST request                       UrlEncodedFormEntity urlEncodedFormEntity   new UrlEncodedFormEntity nameValuePairList                           setEntity   hands the entity  here it is urlEncodedFormEntity  to the request                      httpPost setEntity urlEncodedFormEntity                        try                              HttpResponse is an interface just like HttpPost                            Therefore we can t initialize them                         HttpResponse httpResponse   httpClient execute httpPost                               According to the JAVA API  InputStream constructor do nothing                             So we can t initialize InputStream although it is not an interface                         InputStream inputStream   httpResponse getEntity   getContent                             InputStreamReader inputStreamReader   new InputStreamReader inputStream                            BufferedReader bufferedReader   new BufferedReader inputStreamReader                            StringBuilder stringBuilder   new StringBuilder                             String bufferedStrChunk   null                           while  bufferedStrChunk   bufferedReader readLine       null                               stringBuilder append bufferedStrChunk                                                      return stringBuilder toString                           catch  ClientProtocolException cpe                            System out println  First Exception caz of HttpResponese      cpe                           cpe printStackTrace                          catch  IOException ioe                            System out println  Second Exception caz of HttpResponse      ioe                           ioe printStackTrace                                             catch  UnsupportedEncodingException uee                        System out println  An Exception given because of UrlEncodedFormEntity argument      uee                       uee printStackTrace                                       return null                              Override             protected void onPostExecute String result                    super onPostExecute result                    if result equals  working                         Toast makeText getApplicationContext     HTTP POST is working      Toast LENGTH LONG  show                     else                      Toast makeText getApplicationContext     Invalid POST req      Toast LENGTH LONG  show                                                                  SendPostReqAsyncTask sendPostReqAsyncTask   new SendPostReqAsyncTask            sendPostReqAsyncTask execute givenUsername  givenPassword

User · Answer

to  primpop answer I would add how to convert the response in a String   HttpResponse response   client execute request   HttpEntity entity   response getEntity    if  entity    null        InputStream instream   entity getContent         String result   RestClient convertStreamToString instream       Log i  Read from server   result       Here is an example of convertStramToString

[java] Sending POST data in Android

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