MainActivity Multipart

fun uploadImage(imagePath: String)
    {
        var textToPost = nameToPostET.text.toString()

        val URL = "http://192.168.100.10/"
        val gsonBuilder = GsonBuilder().setLenient()
        val gson = gsonBuilder.create()

        val retrofit = Retrofit.Builder()
            .baseUrl(URL)
            .addConverterFactory(GsonConverterFactory.create(gson))
            .build()

        val webApiInterface = retrofit.create(WEBApiInterface::class.java)

        val file = File(imagePath)

        val requestBody = RequestBody.create(MediaType.parse("*/*"), file)

        val fileToUpload = MultipartBody.Part.createFormData("upload_file", file.name, requestBody)

        val requestPOST = RequestBody.create(MediaType.parse("plain/text"), textToPost)

        var call = webApiInterface.uploadFile(fileToUpload, requestPOST)

        call.enqueue(object : Callback<FileResponse> {
            override fun onFailure(call: Call<FileResponse>?, t: Throwable?) {
                Log.e("MainActivity", t.toString())
            }

            override fun onResponse(call: Call<FileResponse>?, response: Response<FileResponse>?) {
                if(response!!.isSuccessful)
                {
                    Log.v("MainActivity", "RESPONSE IS SUCCESSFUL")
                    var message = response.body().message
                    Toast.makeText(applicationContext, "MESSAGE --> "+message, Toast.LENGTH_LONG).show()

                    var postTestMessage = response.body().postTestMessage
                    Toast.makeText(applicationContext, "POST TEST MESSAGE --> "+postTestMessage, Toast.LENGTH_LONG).show()
                }
                else
                {
                    Log.e("MainActivity", "RESPONSE ISNT SUCCESSFUL")
                }
            }

        })

    }