Upload Image using Retrofit and PHP API - php

Question

I am trying to upload image with Retrofit API. My android code is like below
public interface FileUploadService {
#Multipart
#POST("upload.php")
Single<ResponseBody> onFileUpload(#Part("username") RequestBody mUserName, #Part MultipartBody.Part file);
}
and PHP code is like below
<?php
$target_dir = "upload/";
$target_file_name = $target_dir .basename($_FILES["file"]["name"]);
$response = array();
// Check if image file is a actual image or fake image
if (isset($_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);
?>
I am not getting any error in android side and its working fine but in server, I am getting error like below
PHP Notice: Undefined index: file in line 3
Let me know what I am missing. Thanks!

Answer 1

In your server part code, you're expecting the field name to be file. I guess that while preparing multipart data in Android, you're not using the same name (file).
In your Activity/Fragment, the multipart data preparation code should look like below.
String fileName = "your file name with extension";
RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
MultipartBody.Part.createFormData("file", fileName, requestBody);
// ----^^^^--- look at the field name (first parameter)