[android help] Invalid file on uploading text file to sever with HttpPost?

I'm trying to upload a text file that already is in SD-card of emulator and it's size is less than 4KB.This is php code for uploading file in server side:

$allowedExts = array("jpg", "jpeg", "gif", "png", "txt", "xml");
$extension = end(explode(".", $_FILES["file"]["name"]));
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/png")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "text/plain")
|| ($_FILES["file"]["type"] == "text/xml"))
&& ($_FILES["file"]["size"] < 2000000)
&& in_array($extension, $allowedExts))
  {
  if ($_FILES["file"]["error"] > 0)
    {
    echo "Return Code: " . $_FILES["file"]["error"] . "
";
    }
  else
    {
    echo "Upload: " . $_FILES["file"]["name"] . "
";
    echo "Type: " . $_FILES["file"]["type"] . "
";
    echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB
";
    echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
";

    if (file_exists("upload/" . $_FILES["file"]["name"]))
      {
      echo $_FILES["file"]["name"] . " already exists. ";
      }
    else
      {
      move_uploaded_file($_FILES["file"]["tmp_name"],
      "upload/" . $_FILES["file"]["name"]);
      echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
      }
    }
  }
else
  {
  echo "Invalid file";
  }
?>

To upload text file,I execute an AsyncTask and it is it's doInBackground():

@Override
protected Boolean doInBackground(String... url) {
    File home = new File(path + "/" + "home #" + address + ".txt");
    String response;
    try {
        response = OpenHttpConnection(home, "text/plain");
    } catch (IOException e) {
        return false;
    }
    if (response.toLowerCase().contains("invalid")) {
        return false;
    }
    return true;
}

This is OpenHttpConnection method:

private String OpenHttpConnection(File file, String mime)
throws IOException {

    StringBuilder s = null;
    try {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(
        Constants.UPLOAD_ADDRESS);

        MultipartEntity entity = new MultipartEntity();

        entity.addPart("data", new FileBody(file, mime));
        httppost.setEntity(entity);
        HttpResponse response = httpclient.execute(httppost);
        BufferedReader reader = new BufferedReader(new InputStreamReader(
        response.getEntity().getContent(), "UTF-8"));
        String sResponse;
        s = new StringBuilder();

        while ((sResponse = reader.readLine()) != null) {
            s = s.append(sResponse);
        }

    } catch (Exception e) {
        e.printStackTrace();
        return "exception " + e.toString();
    }

    return s.toString();
}

But upload failed and when I debug uploading progress,response(in "doInBackground") is equal to "Invalid file".Also I tried to change OpenHttpConnection() method and create entity of HttpPost without using "mime type",like this:

entity.addPart("data", new FileBody(file));

But result is same.Is there any thing that I did wrong?

.

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