邮政请求reatrofit2 android Studio Kotlin

Question

我需要创建用户。必须使用请求帖子。我使用了，但这确实不起作用，没有错误 。您可以看到我的

服务器我的代码：

允许：post，选项

content-type：application/json

{ “名”： ””， “姓”： ””， “电子邮件”： ””， “用户名”：“”， “密码”： ”” }

api.kt

interface Api {
@POST("users/signup")
@FormUrlEncoded
fun createUser(
    @Field("first_name") fName: String,
    @Field("last_name") lName: String,
    @Field("email") email: String,
    @Field("username") username: String,
    @Field("password") password: String,
): Call<DefaultResponse>
}

retrofitclient.kt

object RetrofitClient {

private val okHttpClient = OkHttpClient.Builder()
    .addInterceptor { chain ->
        val original = chain.request()

        val requestBuilder = original.newBuilder()
            .method(original.method(), original.body())

        val request = requestBuilder.build()
        chain.proceed(request)
    }.build()

val instance: Api by lazy {
    val retrofit = Retrofit.Builder()
        .baseUrl(BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .client(okHttpClient)
        .build()

    retrofit.create(Api::class.java)
}
}

defaultresponse.kt

data class DefaultResponse (val error: Boolean, val message: String)

常量

class Constants {

companion object {
    const val BASE_URL = "http://194.62.43.26:1337/api/"
}
}

​

binding.btnSignup
        .setOnClickListener {

            val username = binding.etUsername.text.toString().trim()
            val password = binding.etPw.text.toString().trim()
            val fName = binding.etFirstName.text.toString().trim()
            val lName = binding.etLastName.text.toString().trim()
            val email = binding.etEmail.text.toString().trim()

            if (username.isEmpty()) {
                binding.etUsername.error = "Password required"
                binding.etUsername.requestFocus()
                return@setOnClickListener
            }

            if (password.isEmpty()) {
                binding.etPw.error = "Password required"
                binding.etPw.requestFocus()
                return@setOnClickListener
            }

            RetrofitClient.instance.createUser(fName, lName, email, username, password)
                .enqueue(object : Callback<DefaultResponse> {
                    override fun onFailure(call: Call<DefaultResponse>, t: Throwable) {
                        Toast.makeText(applicationContext, t.message, Toast.LENGTH_LONG).show()
                    }

                    override fun onResponse(
                        call: Call<DefaultResponse>,
                        response: Response<DefaultResponse>
                    ) {
                        Toast.makeText(
                            applicationContext,
                            response.body()?.message,
                            Toast.LENGTH_LONG
                        ).show()
                    }

                })