Add login api service and move phone number validation to view model

app/src/main/java/com/navi/medici/android_customer_app/login/Login.kt

@@ -1,5 +1,3 @@
 package com.navi.medici.android_customer_app.login
 
-data class Login(var phoneNumber: String) {
-    fun isValidPhoneNumber(): Boolean = phoneNumber.length == 10
-}
+data class Login(var phoneNumber: String)

app/src/main/java/com/navi/medici/android_customer_app/login/LoginApiService.kt

@@ -1,2 +1,24 @@
 package com.navi.medici.android_customer_app.login
 
+import android.util.Log
+import retrofit2.Retrofit
+import retrofit2.converter.scalars.ScalarsConverterFactory
+import retrofit2.http.POST
+
+private const val BASE_URL = "https://jsonplaceholder.typicode.com"
+
+private val retrofit = Retrofit.Builder()
+    .addConverterFactory(ScalarsConverterFactory.create())
+    .baseUrl(BASE_URL)
+    .build()
+
+interface LoginApiService {
+    @POST("posts")
+    fun submitPhoneNumber(phoneNumber: String) {
+        Log.i("post body", phoneNumber)
+    }
+}
+
+object Retrofit {
+    val loginApi: LoginApiService by lazy { retrofit.create(LoginApiService::class.java) }
+}

app/src/main/java/com/navi/medici/android_customer_app/login/LoginRepository.kt

@@ -1,2 +1,4 @@
 package com.navi.medici.android_customer_app.login
 
+class LoginRepository {
+}

app/src/main/java/com/navi/medici/android_customer_app/login/LoginViewModel.kt

@@ -7,7 +7,9 @@ class LoginViewModel : ViewModel() {
 
     fun onChangePhoneNumber(phoneNumber: String) {
         login.phoneNumber = phoneNumber
-        if (login.isValidPhoneNumber()) {
+        if (isValidPhoneNumber(phoneNumber)) {
         }
     }
+
+    private fun isValidPhoneNumber(phoneNumber: String): Boolean = phoneNumber.length == 10
 }