aligkts

data class DocumentsItem(

	@field:SerializedName("createTime")
	val createTime: String? = null,

	@field:SerializedName("name")
	val name: String? = null,

	@field:SerializedName("updateTime")
	val updateTime: String? = null,

aligkts

data class Fields(

	@field:SerializedName("surname")
	val surname: Value? = null,

	@field:SerializedName("name")
	val name: Value? = null
)

aligkts

data class Value(

	@field:SerializedName("stringValue")
	val stringValue: String? = null
)

aligkts

class RetrofitClient {

    companion object {
        const val baseUrl = "https://firestore.googleapis.com/v1/projects/firestorerestapi/databases/"
        fun getApi(): Retrofit {
            return Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(GsonConverterFactory.create())
                .build()
        }

aligkts

interface ApiHelper {

    @GET("(default)/documents/user")
    fun getUser(): Call<UserResponse>

}

aligkts

class ApiClient {

     fun getUserFromApi(requestCallback: (isSuccess: Boolean, response: UserResponse?,message: String?) -> (Unit)) {
        RetrofitClient.getApi()
            .create(ApiHelper::class.java)
            .getUser()
            .enqueue(object : Callback<UserResponse> {

                override fun onFailure(call: Call<UserResponse>, t: Throwable) {
                    requestCallback(false,null,t.localizedMessage)

aligkts

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        tools:context=".MainActivity">

aligkts

private val apiClient by lazy { ApiClient() }

aligkts

apiClient.getUserFromApi { isSuccess, response, message ->
            if (isSuccess) {
                val name = response?.documents?.first()?.fields?.name
                val surname = response?.documents?.first()?.fields?.surname
                name?.let { _name ->
                    txt_name.text = _name.stringValue
                }
                surname?.let { _surname ->
                    txt_surname.text = _surname.stringValue
                }

aligkts

<uses-permission android:name="android.permission.INTERNET"/>