Make an HTTP request with android

Question

I have searched everywhere but I couldn t find my answer  is there a way to make a simple HTTP request  I want to request a PHP page   script on one of my websites but I don t want to show the webpage  If possible I even want to do it in the background  in a BroadcastReceiver

User · Answer

I made this for a webservice to requerst on URL, using a Gson lib:

Client:

public EstabelecimentoList getListaEstabelecimentoPorPromocao(){

        EstabelecimentoList estabelecimentoList  = new EstabelecimentoList();
        try{
            URL url = new URL("http://" +  Conexao.getSERVIDOR()+ "/cardapio.online/rest/recursos/busca_estabelecimento_promocao_android");
            HttpURLConnection con = (HttpURLConnection) url.openConnection();

            if (con.getResponseCode() != 200) {
                    throw new RuntimeException("HTTP error code : "+ con.getResponseCode());
            }

            BufferedReader br = new BufferedReader(new InputStreamReader((con.getInputStream())));
            estabelecimentoList = new Gson().fromJson(br, EstabelecimentoList.class);
            con.disconnect();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return estabelecimentoList;
}

User · Answer

The most simple way is using the Android lib called Volley     Volley offers the following benefits       Automatic scheduling of network requests  Multiple concurrent network   connections  Transparent disk and memory response caching with   standard HTTP cache coherence  Support for request prioritization    Cancellation request API  You can cancel a single request  or you can   set blocks or scopes of requests to cancel  Ease of customization  for   example  for retry and backoff  Strong ordering that makes it easy to   correctly populate your UI with data fetched asynchronously from the   network  Debugging and tracing tools    You can send a http https request as simple as this              Instantiate the RequestQueue          RequestQueue queue   Volley newRequestQueue this           String url   http   www yourapi com           JsonObjectRequest request   new JsonObjectRequest url  null              new Response Listener lt JSONObject gt                       Override                 public void onResponse JSONObject response                        if  null    response                             try                                  handle your response                            catch  JSONException e                                 e printStackTrace                                                                                      new Response ErrorListener                   Override             public void onErrorResponse VolleyError error                                       queue add request     In this case  you needn t consider  running in the background  or  using cache  yourself as all of these has already been done by Volley

User · Answer

UPDATE This is a very old answer  I definitely won t recommend Apache s client anymore  Instead use either   OkHttp HttpUrlConnection  Original Answer First of all  request a permission to access network  add following to your manifest   lt uses-permission android name  quot android permission INTERNET quot    gt   Then the easiest way is to use Apache http client bundled with Android      HttpClient httpclient   new DefaultHttpClient        HttpResponse response   httpclient execute new HttpGet URL        StatusLine statusLine   response getStatusLine        if statusLine getStatusCode      HttpStatus SC OK           ByteArrayOutputStream out   new ByteArrayOutputStream            response getEntity   writeTo out           String responseString   out toString            out close                more logic       else            Closes the connection          response getEntity   getContent   close            throw new IOException statusLine getReasonPhrase            If you want it to run on separate thread I d recommend extending AsyncTask  class RequestTask extends AsyncTask lt String  String  String gt         Override     protected String doInBackground String    uri            HttpClient httpclient   new DefaultHttpClient            HttpResponse response          String responseString   null          try               response   httpclient execute new HttpGet uri 0                 StatusLine statusLine   response getStatusLine                if statusLine getStatusCode      HttpStatus SC OK                   ByteArrayOutputStream out   new ByteArrayOutputStream                    response getEntity   writeTo out                   responseString   out toString                    out close                  else                    Closes the connection                  response getEntity   getContent   close                    throw new IOException statusLine getReasonPhrase                             catch  ClientProtocolException e                  TODO Handle problems             catch  IOException e                  TODO Handle problems                     return responseString                  Override     protected void onPostExecute String result            super onPostExecute result             Do anything with response            You then can make a request by     new RequestTask   execute  quot http   stackoverflow com quot

User · Answer

Note  The Apache HTTP Client bundled with Android is now deprecated in favor of HttpURLConnection  Please see the Android Developers Blog for more details   Add  lt uses-permission android name  android permission INTERNET    gt  to your manifest   You would then retrieve a web page like so   URL url   new URL  http   www android com     HttpURLConnection urlConnection    HttpURLConnection  url openConnection    try        InputStream in   new BufferedInputStream urlConnection getInputStream          readStream in     finally        urlConnection disconnect        I also suggest running it on a separate thread    class RequestTask extends AsyncTask lt String  String  String gt     Override protected String doInBackground String    uri        String responseString   null      try           URL url   new URL myurl           HttpURLConnection conn    HttpURLConnection  url openConnection            if conn getResponseCode      HttpsURLConnection HTTP OK                  Do normal input or output stream reading                   else               response    FAILED      See documentation for more info on response handling                 catch  ClientProtocolException e              TODO Handle problems         catch  IOException e              TODO Handle problems             return responseString      Override protected void onPostExecute String result        super onPostExecute result         Do anything with response         See the documentation for more information on response handling and POST requests

User · Answer

This is the new code for HTTP Get POST request in android  HTTPClient is depricated and may not be available as it was in my case   Firstly add the two dependencies in build gradle   compile  org apache httpcomponents httpcore 4 4 1  compile  org apache httpcomponents httpclient 4 5    Then write this code in ASyncTask in doBackground method    URL url   new URL  http   localhost 8080 web get key value     HttpURLConnection urlConnection    HttpURLConnection url openConnection     urlConnection setRequestMethod  GET     int statusCode   urlConnection getResponseCode     if  statusCode     200          InputStream it   new BufferedInputStream urlConnection getInputStream           InputStreamReader read   new InputStreamReader it         BufferedReader buff   new BufferedReader read         StringBuilder dta   new StringBuilder          String chunks         while  chunks   buff readLine       null                   dta append chunks               else           Handle else

User · Answer

With a thread   private class LoadingThread extends Thread       Handler handler       LoadingThread Handler h            handler   h             Override     public void run             Message m   handler obtainMessage            try               BufferedReader in                    new BufferedReader new InputStreamReader url openStream                  String page                   String inLine               while   inLine   in readLine       null                    page    inLine                             in close                Bundle b   new Bundle                b putString  result   page               m setData b             catch  MalformedURLException e                e printStackTrace              catch  IOException e                e printStackTrace                       handler sendMessage m

User · Answer

private String getToServer String service  throws IOException       HttpGet httpget   new HttpGet service       ResponseHandler lt String gt  responseHandler   new BasicResponseHandler        return new DefaultHttpClient   execute httpget  responseHandler        Regards

User · Answer

unless you have an explicit reason to choose the Apache HttpClient  you should prefer java net URLConnection  you can find plenty of examples of how to use it on the web   we ve also improved the Android documentation since your original post  http   developer android com reference java net HttpURLConnection html  and we ve talked about the trade-offs on the official blog  http   android-developers blogspot com 2011 09 androids-http-clients html

User · Answer

As none of the answers described a way to perform requests with OkHttp  which is very popular http client nowadays for Android and Java in general  I am going to provide a simple example     get an instance of the client OkHttpClient client   new OkHttpClient       add parameters HttpUrl Builder urlBuilder   HttpUrl parse  https   www example com   newBuilder    urlBuilder addQueryParameter  query    stack-overflow      String url   urlBuilder build   toString       build the request Request request   new Request Builder   url url  build       execute Response response   client newCall request  execute      The clear advantage of this library is that it abstracts us from some low level details  providing more friendly and secure ways to interact with them  The syntax is also simplified and permits to write nice code

User · Answer

Use Volley as suggested above  Add following into build gradle  Module  app   implementation  com android volley volley 1 1 1    Add following into AndroidManifest xml    lt uses-permission android name  android permission INTERNET    gt    And add following to you Activity code   public void httpCall String url         RequestQueue queue   Volley newRequestQueue this        StringRequest stringRequest   new StringRequest Request Method GET  url              new Response Listener lt String gt                       Override                 public void onResponse String response                           enjoy your response                                  new Response ErrorListener                      Override                 public void onErrorResponse VolleyError error                           enjoy your error status                                queue add stringRequest       It replaces http client and it is very simple

User · Answer

For me  the easiest way is using library called Retrofit2  We just need to create an Interface that contain our request method  parameters  and also we can make custom header for each request        public interface MyService           GET  users  user  repos         Call lt List lt Repo gt  gt  listRepos  Path  user   String user           GET  user         Call lt UserDetails gt  getUserDetails  Header  Authorization   String   credentials           POST  users new         Call lt User gt  createUser  Body User user           FormUrlEncoded        POST  user edit         Call lt User gt  updateUser  Field  first name   String first                                Field  last name   String last           Multipart        PUT  user photo         Call lt User gt  updateUser  Part  photo   RequestBody photo                                Part  description   RequestBody description           Headers            Accept  application vnd github v3 full json            User-Agent  Retrofit-Sample-App                  GET  users  username          Call lt User gt  getUser  Path  username   String username                And the best is  we can do it asynchronously easily using enqueue method

User · Answer

Look at this awesome new library which is available via gradle     build gradle  compile  com apptakk http request http-request 0 1 2   Usage   new HttpRequestTask      new HttpRequest  http   httpbin org post   HttpRequest POST       some      data            new HttpRequest Handler            Override       public void response HttpResponse response            if  response code    200              Log d this getClass   toString     Request successful               else             Log e this getClass   toString     Request unsuccessful      response                            execute      https   github com erf http-request

[android] Make an HTTP request with android

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