config.php

<?php
$DB_SERVER = "localhost";
$DB_USER   = "root";
$DB_PASS	= "";
$DB_NAME    ="kgchatdb";
$conn = mysql_connect($DB_SERVER,$DB_USER,$DB_PASS) or die('localhost connection problem'.mysql_error());
mysql_select_db($DB_NAME, $conn);
?>

fileupload.php

<?php
include_once 'config.php';

if($_SERVER['REQUEST_METHOD']=='POST'){
$target_dir = "profile_images/";
$target_file_name = $target_dir .basename($_FILES["file"]["name"]);
$deviceId = $_POST['deviceId'];

$sql = "update contact_registration set contact_image = '$target_file_name' where deviceid = '$deviceId'";
echo $sql;

$response = array();

// Check if image file is a actual image or fake image
if (isset($_FILES["file"])) 
{
 if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file_name)) 
 {
  $success = true;
  $message = "Successfully Uploaded";
 }
 else 
 {
  $success = false;
  $message = "Error while uploading";
 }
}
else 
{
 $success = false;
 $message = "Required Field Missing";
}

$response["success"] = $success;
$response["message"] = $message;
echo json_encode($response);
if (!pg_query($sql)) { // Error handling
    echo "Something went wrong! :("; 
}

echo 'Connected successfully';

pg_close($link);
}
?>

Retrofit.java

    compile 'com.google.code.gson:gson:2.6.2'
    compile 'com.squareup.retrofit2:retrofit:2.1.0'

public interface ApiService {
    @NonNull
    private RequestBody createPartFromString(String descriptionString) {
        return RequestBody.create(
                MediaType.parse(MULTIPART_FORM_DATA), descriptionString);
    }

    @Multipart
    @POST("chats/v1/rest/imageChat.php")
    Call<ResponseBody> uploadImageWithPartMap(
            @PartMap() Map<String, RequestBody> partMap,
            @Part MultipartBody.Part file);
}

public void uploadFile(String fileUrl,String type) {

        Gson gson = new GsonBuilder()
                .setLenient()
                .create();

        // Change base URL to your upload server URL.
        Retrofit build = new Retrofit.Builder()
                .baseUrl(Config.EMULATOR_ENDPOINT)
                .addConverterFactory(GsonConverterFactory.create(gson))
                .build();
        ApiService service = build.create(ApiService.class);
        File file = new File(fileUrl);
        String regId = getRegId();
        RequestBody reqFile = null;
        if(type.equals("image")) {
            reqFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
        }else if(type.equals("voice")) {
            reqFile = RequestBody.create(MediaType.parse("multipart/form-data"), fileUrl);
        }
        MultipartBody.Part body = MultipartBody.Part.createFormData("file", file.getName(), reqFile);

        // create a map of data to pass along
        RequestBody regIdReq   = createPartFromString(regId);
        RequestBody fileUrlReq = createPartFromString(fileUrl);
        RequestBody selectedContact = createPartFromString(getContactSelected());
        RequestBody titleReq   = null;
        RequestBody messageReq   = null;
        if(type.equals("image")) {
            titleReq = createPartFromString("Image");
            messageReq = createPartFromString("new images");
        }else if(type.equals("voice")) {
            titleReq = createPartFromString("Voice");
            messageReq = createPartFromString("voice message");
        }
        RequestBody typeReq    = createPartFromString(type);


        HashMap<String, RequestBody> map = new HashMap<>();
        map.put("regId", regIdReq);
        map.put("message", messageReq);
        map.put("fileUrl", fileUrlReq);
        map.put("title",titleReq);
        map.put("type",typeReq);
        map.put("contactSelectedId",selectedContact);

        Call<ResponseBody> call = null;
        if(type.equals("image")) {
            call = service.uploadImageWithPartMap(map, body);
        }else if(type.equals("voice")) {
            call = service.uploadVoiceWithPartMap(map, body);
        }
        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                // Do
                if(response.isSuccessful()){
                    System.out.println(response.body().toString()+":Successful");
                    System.out.println("Url:"+response.raw().request().url());
                }
            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {
                t.printStackTrace();
                onErrorDialog("No Internet",mainActivity.getString(R.string.network_error));
            }
        });
    }