android upload function

private  void UploadProfilePicture(Uri imageUri){
        if (imageUri!=null){
            File file=new File(imageUri.getPath());
            if (file==null)
                return;
            RequestBody requestUserId=RequestBody.create(MediaType.parse("multipart/form-data"),reseller.getUsername());
            RequestBody requestKey=RequestBody.create(MediaType.parse("multipart/form-data"),reseller.getPassword());
            RequestBody requestImage =RequestBody.create(MediaType.parse("multipart/form-data"),file);
            MultipartBody.Part imagePart = null;
            imagePart=MultipartBody.Part.createFormData("fileToUpload",file.getName(),requestImage);

            Call<ResponseBody>uploadProfile= controller.getService().uploadProfilepic(imagePart,requestUserId,requestKey);
            uploadProfile.enqueue(new Callback<ResponseBody>() {
                 @Override
                 public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                     if (!response.isSuccessful()){
                         Toast.makeText(MainActivity.this, "Server Problem : code "+response.code(), Toast.LENGTH_SHORT).show();
                         return;
                     }

                     try {

                         Toast.makeText(MainActivity.this, response.body().string(), Toast.LENGTH_SHORT).show();

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

                 @Override
                 public void onFailure(Call<ResponseBody> call, Throwable t) {
                     Toast.makeText(MainActivity.this, "Some Thing went wrong!", Toast.LENGTH_SHORT).show();

                 }
             });

        }else
            Toast.makeText(this, "Image File Not found!", Toast.LENGTH_SHORT).show();
    }

FileUpload Using Php with android retrofit

<?php 
session_start();
require_once 'autoload.php';

$user     = Xss::xssClean(Input::get('user'));
$key      = Xss::xssClean(Input::get('key'));

if(!isset($user) || empty($user)){
      echo 'ERROR : INVALID REQUEST';
      exit();
}

if(!isset($key) || empty($key)){
      echo 'ERROR : INVALID REQUEST';
      exit();
}
    $verifyUserSql  = "SELECT * FROM reseller WHERE username = ? LIMIT 1";
    $userVerifyUser = DB::getInstance()->get($verifyUserSql, array($user));
    $userCount      = $userVerifyUser->Count();
    if ($userCount > 0) {
          $loginSql   = "SELECT * FROM reseller WHERE username = ? AND password = ? AND status = 1 LIMIT 1";
          $loginQuery = DB::getInstance()->get($loginSql, array($user, $key));
          $loginCount = $loginQuery->Count();
          if ($loginCount > 0) {
                $loginResults = $loginQuery->result();
                foreach ($loginResults as $login) {
                      $id       = $login->id;
                      $userType = $login->custype;
                      $name     = $login->name;
                      $userName = $login->username;
                      $pin      = $login->pincode;
                }
                Session::set('pin',$pin);
                Session::set('id',$id);
                Session::set('userName', $userName);
                
          } else {
                echo 'ERROR : INVALID USER';
                exit();
          }
    } else {
          echo 'ERROR : INVALID USER';
          exit();
    }
 
 
    $target_dir = "../content/profile_images/";
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
    
    
      $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
      if($check !== false) {
       
        $uploadOk = 1;
      } else {
        echo "File is not an image.";
        $uploadOk = 0;
        exit();
      }
      
     if ($_FILES["fileToUpload"]["size"] > 1000000) {
       echo "Sorry, your file is too large.max size: 1mb";
       $uploadOk = 0;
       exit();
     }

    
    if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
    && $imageFileType != "gif" ) {
      echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
      exit();
    }
    
    $newfileName='khantelecomimageofuserthisklasdjfkasdflk'.Session::get('id');
     
     if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_dir.$newfileName)) {
         echo "Your Profile has been uploaded.";
        exit();
      } else {
        echo "Sorry, there was an error uploading your file.";
        exit();
      }
      
  

?>

retrofit api interface

 @Multipart
    @POST("/api/profilepic.php")
    Call<ResponseBody> uploadProfilepic(
                                        @Part MultipartBody.Part filefileToUpload,
                                        @Part("user") RequestBody user,
                                        @Part("key") RequestBody key);