title: Multiple Images upload in android asynchronously using phonegap
body: <p>I have an issue with multiple images upload to php server. The code given below works fine for android 2.x versions, but the same code doesn't work for android 4.x and above. I have googled and found out that the data posting has to be done asynchronously by AsyncTask. But I have no clue about how it has to be done via phonegap(calling of async task). </p>
  
  <p>Here I have my code :</p>
  
  <pre><code>package com.mymedlinks.hybrid;
  
  import java.util.TimeZone;
  
  import org.apache.cordova.api.Plugin;
  import org.apache.cordova.api.PluginResult;
  import org.json.JSONArray;
  import org.json.JSONException;
  import org.json.JSONObject;
  
  import android.content.ContextWrapper;
  import android.provider.Settings;
  import android.util.Log;
  
  public class SamplePlugin extends Plugin{
      public String ACTION_POST_DATA="post_data";
  
      @Override
      public PluginResult execute(String arg0, JSONArray arg1, String arg2) {
          // TODO Auto-generated method stub
          PluginResult pluginRes;
          if(ACTION_POST_DATA.equals(arg0)){
              try {
                  pluginResult = imgsUpload(args.getString(0),
                          args.getString(1), args.getString(2));
              } catch (JSONException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
          } else{
              pluginRes = new PluginResult(PluginResult.Status.INVALID_ACTION);;
          }
          return pluginRes;
      }
  
      private PluginResult imgsUpload(String date,String time,
               String fileNames) {
               PluginResult pluginResult=null;
          HttpURLConnection conn = null;
          DataOutputStream dos = null;
          DataInputStream inStream = null;
          ByteArrayOutputStream baos = null;
          byte[] imgData = null;
          String urlString = "https://www.mysampledata.com/upload_imgs.php";
  
                  //opening of http connection
                  try {
              URL url = new URL(urlString);
              conn = (HttpURLConnection) url.openConnection();
              conn.setDoInput(true);
              conn.setDoOutput(true);
              conn.setUseCaches(false);
              conn.setRequestMethod("POST");
              conn.setRequestProperty("Connection", "Keep-Alive");
              conn.setRequestProperty("Content-Type",
                      "multipart/form-data;boundary=---------------------------1177141514664");
              String msg = "";
              StringBuffer buffr = new StringBuffer(msg);
  
              buffr.append("-----------------------------1177141514664");
              buffr.append(CrLf);
              buffr.append("Content-Disposition: form-data; name=\"date\";"
                      + CrLf);
              buffr.append(CrLf);
              buffr.append(date + CrLf);
  
              buffr.append("-----------------------------1177141514664");
              buffr.append(CrLf);
              buffr.append("Content-Disposition: form-data; name=\"time\";"
                      + CrLf);
              buffr.append(CrLf);
              buffr.append(time + CrLf);
  
              buffr.append("-----------------------------1177141514664");
              buffr.append(CrLf);
              buffr.append("Content-Disposition: form-data; name=\"MAX_FILE_SIZE\";"
                      + CrLf);
              buffr.append(CrLf);
              buffr.append("100000000072000" + CrLf);
  
              buffr.append("-----------------------------1177141514664");
              buffr.append(CrLf);
              buffr.append("Content-Disposition: form-data; name=\"method\";"
                      + CrLf);
              buffr.append(CrLf);
              buffr.append("upload.snapshots" + CrLf);
  
              String msg1 = "";
              StringBuffer buffr1 = new StringBuffer(msg1);
              List&lt;byte[]&gt; byetsInfo = new ArrayList&lt;byte[]&gt;();
              ArrayList&lt;String&gt; filenames = new ArrayList&lt;String&gt;();
              try {
                  JSONObject jObj = new JSONObject(new String(fileNames));
                  JSONArray jArray = jObj.getJSONArray("snapshot_images");
                  String drPath = android.os.Environment
                          .getExternalStorageDirectory().toString();
  
                  for (int i = 0; i &lt; jArray.length(); i++) {
                      String img = jArray.getString(i);
                      Log.e("sample app", " imageName " + img);
  
                      File f = new File(drPath + "/sample_app_images/" + img);
                      Uri ur = Uri.fromFile(f);
                      filenames.add(img);
                      Bitmap bmp;
                      try {
                          bmp = Media.getBitmap(this.cordova.getActivity()
                                  .getContentResolver(), ur);
                          baos = new ByteArrayOutputStream();
                          bmp.compress(CompressFormat.JPEG, 90, baos);
  
                          imgData = baos.toByteArray();
                          Log.e("sample app", " img data size " + imgData.length);
  
                      } catch (FileNotFoundException e) {
                          // TODO Auto-generated catch block
                          e.printStackTrace();
                      } catch (IOException e) {
                          // TODO Auto-generated catch block
                          e.printStackTrace();
                      }
  
                      byetsInfo.add(imgData);
  
                  }
  
              } catch (JSONException e1) {
                  // TODO Auto-generated catch block
                  e1.printStackTrace();
              }
  
              String msg3 = "";
              StringBuffer buffr3 = new StringBuffer(msg3);
              buffr3.append(CrLf);
              buffr3.append("-----------------------------4664151417711--");
              buffr3.append(CrLf);
  
              conn.setChunkedStreamingMode(0);
  
              for (int i = 0; i &lt; byetsInfo.size(); i++) {
                  dos = new DataOutputStream(conn.getOutputStream());
  
                  buffr1.delete(0, buffr1.length());
                  buffr1.append("-----------------------------1177141514664");
                  buffr1.append(CrLf);
                  buffr1.append("Content-Disposition: form-data; name=\"snapshotUpload[]\"; filename=\""
                          + filenames.get(i) + "\"" + CrLf);
                  buffr1.append("Content-Type: image/jpeg" + CrLf);
                  buffr1.append(CrLf);
  
                  dos.write(buffr.toString().getBytes());
                  dos.write(buffr1.toString().getBytes());
  
                  int index = 0;
                  int size = 1024;
                  do {
  
                      if ((index + size) &lt; byetsInfo.get(i).length) {
                          size = byetsInfo.get(i).length - index;
                      }
                      dos.write(byetsInfo.get(i), index, size);
                      index += size;
                  } while (index &lt; byetsInfo.get(i).length);
                  Log.e("file upload ", " written: " + index);
  
                  dos.write(buffr3.toString().getBytes());
  
              }
  
              Log.e("Debug", "File is written");
              Log.e("activity upload demo ",
                      " in file upload " + conn.getResponseMessage());
              dos.flush();
  
          } catch (Exception ec) {
              ec.printStackTrace();
          }
  
             String s=null;
          // Read the response
          try {
              inStream = new DataInputStream(conn.getInputStream());
              char buff = 512;
              int len;
              byte[] data = new byte[buff];
              do {
                  len = inStream.read(data);
                  if (len &gt; 0) {
                      System.out.println(new String(data, 0, len));
                      s+=new String(data, 0, len);
                      Log.e("sample app", "  "
                              + new String(data, 0, len));
                  }
              } while (len &gt; 0);
              Log.e("file upload ", " DONE ");
  
              dos.close();
              inStream.close();
  
          } catch (Exception ex) {
              ex.printStackTrace();
          }
  
                  try {
              if(conn.getResponseMessage().equalsIgnoreCase("OK") &amp;&amp; s!=null){
                  pluginResult = new PluginResult(PluginResult.Status.OK, s);
              } else {
                  pluginResult = new PluginResult(PluginResult.Status.ERROR,
                          false);
              }
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
  
          return pluginResult;
  
      }
  
  }
  </code></pre>
  
  <p>The data in the code that is filenames, date and time I get from js code which will be sent to the above class. Can anyone please provide me with an example about how the Async Task can be called via Phonegap (i.e., calling it in the imgsUpload())</p>
  
  <p>Thanks a lot.</p>