HttpPost AsyncTask

gistfile1.txt

private class UploadTask extends AsyncTask<String, Void, String> {

   @Override
   protected String doInBackground(String... params) {
       HashMap<String, String> postData = new HashMap<>();
       postData.put("image", params[0]);
       String t = performPostCall("http://examxple.com/upload.php", postData);
       Log.d("TUNA", t);
       return null;
   }

   public String  performPostCall(String requestURL, HashMap<String, String> postDataParams) {
       URL url;
       String response = "";
       try {
           url = new URL(requestURL);

           HttpURLConnection conn = (HttpURLConnection) url.openConnection();
           conn.setReadTimeout(15000);
           conn.setConnectTimeout(15000);
           conn.setRequestMethod("POST");
           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<String, String> params) throws UnsupportedEncodingException{
       StringBuilder result = new StringBuilder();
       boolean first = true;
       for(Map.Entry<String, String> entry : params.entrySet()){
           if (first)
               first = false;
           else
               result.append("&");

           result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
           result.append("=");
           result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
       }

       return result.toString();
   }

}