6주차 미션 / 안드로이드 2조 사예원

app/build.gradle.kts

@@ -1,3 +1,5 @@
+import java.util.Properties
+
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
@@ -17,7 +19,13 @@ android {
         versionName = "1.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
-
+        val properties = Properties()
+        val localPropertiesFile = rootProject.file("local.properties")
+        if (localPropertiesFile.exists()) {
+            properties.load(localPropertiesFile.inputStream())
+        }
+        val baseUrl = properties.getProperty("BASE_URL") ?: "http://10.0.2.2:8080/"
+        buildConfigField("String", "BASE_URL", "\"$baseUrl\"")
     }
 
     buildTypes {
@@ -38,6 +46,7 @@ android {
     }
     buildFeatures {
         compose = true
+        buildConfig = true
     }
 }
 
@@ -74,4 +83,9 @@ dependencies {
     androidTestImplementation(libs.androidx.espresso.core)
     debugImplementation(libs.androidx.compose.ui.tooling)
     debugImplementation(libs.androidx.compose.ui.test.manifest)
+
+    implementation(libs.retrofit)
+    implementation(libs.retrofit.converter.gson)
+    implementation(libs.okhttp)
+    implementation(libs.okhttp.logging.interceptor)
 }

app/src/main/java/com/example/kuit6_android_api/MainActivity.kt

@@ -1,16 +1,22 @@
 package com.example.kuit6_android_api
 
 import android.Manifest
+import android.annotation.SuppressLint
 import android.content.pm.PackageManager
 import android.os.Build
 import android.os.Bundle
 import android.widget.Toast
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Surface
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.core.content.ContextCompat
 import androidx.navigation.compose.rememberNavController
@@ -32,6 +38,7 @@ class MainActivity : ComponentActivity() {
         }
     }
 
+    @SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -40,15 +47,21 @@ class MainActivity : ComponentActivity() {
 
         setContent {
             KUIT6_Android_APITheme {
-                Surface(
-                    modifier = Modifier.fillMaxSize(),
-                    color = MaterialTheme.colorScheme.background
+                val snackBarState = remember { SnackbarHostState() }
+                Scaffold(
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .background(MaterialTheme.colorScheme.background),
+                    snackbarHost = {
+                        SnackbarHost(snackBarState)
+                    }
                 ) {
                     val navController = rememberNavController()
 
                     NavGraph(
                         navController = navController,
-                        startDestination = PostListRoute
+                        startDestination = PostListRoute,
+                        snackBarState = snackBarState
                     )
                 }
             }

app/src/main/java/com/example/kuit6_android_api/data/api/ApiService.kt

@@ -0,0 +1,51 @@
+package com.example.kuit6_android_api.data.api
+
+import com.example.kuit6_android_api.data.model.request.PostCreateRequest
+import com.example.kuit6_android_api.data.model.response.BaseResponse
+import com.example.kuit6_android_api.data.model.response.PostResponse
+import okhttp3.MultipartBody
+import retrofit2.http.Body
+import retrofit2.http.DELETE
+import retrofit2.http.GET
+import retrofit2.http.Multipart
+import retrofit2.http.POST
+import retrofit2.http.PUT
+import retrofit2.http.Part
+import retrofit2.http.Path
+import retrofit2.http.Query
+
+interface ApiService {
+    @GET("/api/posts")
+    suspend fun getPosts(): BaseResponse<List<PostResponse>>
+
+    @POST("/api/posts")
+    suspend fun createPost(
+        @Query("author") author: String = "예원",
+        @Body request: PostCreateRequest
+    ): BaseResponse<PostResponse>
+
+    // DELETE 요청
+    @DELETE("/api/posts/{id}")
+    suspend fun deletePost(
+        @Path("id") id: Long
+    ): BaseResponse<Unit> // data에 빈 객체 반환
+
+    @GET("/api/posts/{id}")
+    suspend fun getPostDetail(
+        @Path("id") id: Long
+    ): BaseResponse<PostResponse>
+
+    // 업데이트 요청
+    @PUT("/api/posts/{id}")
+    suspend fun updatePost(
+        @Path("id") id: Long,
+        @Body request: PostCreateRequest // 수정된 내용 전달
+    ): BaseResponse<PostResponse> // 수정된 내용이 data에 들어가고, 반환
+
+    // Retrofit에서 이미지 파일을 multipart/form-data로 업로드
+    @Multipart // multipart?form-data 형식의 요청을 보냄
+    @POST("/api/images/upload")
+    suspend fun uploadImage(
+        @Part file: MultipartBody.Part // multipart의 한 조각(part) 타입
+    ):BaseResponse<Map<String, String>> // 본문 data가 key-value의 Map 형식 -> ex) "url":"..."
+}

app/src/main/java/com/example/kuit6_android_api/data/api/RetrofitClient.kt

@@ -0,0 +1,30 @@
+package com.example.kuit6_android_api.data.api
+
+import com.example.kuit6_android_api.BuildConfig
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+import java.util.concurrent.TimeUnit
+
+object RetrofitClient {
+
+    private val loggingInterceptor = HttpLoggingInterceptor().apply {
+        level = HttpLoggingInterceptor.Level.BODY
+    }
+
+    private val okHttpClient = OkHttpClient.Builder()
+        .addInterceptor(loggingInterceptor)
+        .connectTimeout(30, TimeUnit.SECONDS)
+        .readTimeout(30, TimeUnit.SECONDS)
+        .writeTimeout(30, TimeUnit.SECONDS)
+        .build()
+
+    private val retrofit: Retrofit = Retrofit.Builder()
+        .baseUrl(BuildConfig.BASE_URL)
+        .client(okHttpClient)
+        .addConverterFactory(GsonConverterFactory.create())
+        .build()
+
+    val apiService: ApiService = retrofit.create(ApiService::class.java)
+}

app/src/main/java/com/example/kuit6_android_api/data/model/request/PostCreateRequest.kt

@@ -0,0 +1,9 @@
+package com.example.kuit6_android_api.data.model.request
+
+import kotlinx.serialization.SerialName
+
+data class PostCreateRequest(
+    @SerialName("title") val title: String,
+    @SerialName("content") val content: String,
+    @SerialName("imageUrl") val imageUrl: String?,
+)

app/src/main/java/com/example/kuit6_android_api/data/model/response/AuthorResponse.kt

@@ -0,0 +1,9 @@
+package com.example.kuit6_android_api.data.model.response
+
+import kotlinx.serialization.SerialName
+
+data class AuthorResponse(
+    @SerialName("id") val id: Long,
+    @SerialName("username") val username: String,
+    @SerialName("profileImageUrl") val profileImageUrl: String?
+)

app/src/main/java/com/example/kuit6_android_api/data/model/response/BaseResponse.kt

@@ -0,0 +1,10 @@
+package com.example.kuit6_android_api.data.model.response
+
+import kotlinx.serialization.SerialName
+
+data class BaseResponse<T>(
+    @SerialName("success") val success: Boolean,
+    @SerialName("message") val message: String?,
+    @SerialName("data") val data: T?,
+    @SerialName("timestamp") val timestamp: String
+)

app/src/main/java/com/example/kuit6_android_api/data/model/response/PostResponse.kt

@@ -0,0 +1,13 @@
+package com.example.kuit6_android_api.data.model.response
+
+import kotlinx.serialization.SerialName
+
+data class PostResponse(
+    @SerialName("id") val id: Long,
+    @SerialName("title") val title: String,
+    @SerialName("content") val content: String,
+    @SerialName("imageUrl") val imageUrl: String?,
+    @SerialName("author") val author: AuthorResponse,
+    @SerialName("createdAt") val createdAt: String,
+    @SerialName("updatedAt") val updatedAt: String
+)

app/src/main/java/com/example/kuit6_android_api/ui/navigation/NavGraph.kt

@@ -1,5 +1,6 @@
 package com.example.kuit6_android_api.ui.navigation
 
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.runtime.Composable
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.NavHost
@@ -13,7 +14,8 @@ import com.example.kuit6_android_api.ui.post.screen.PostListScreen
 @Composable
 fun NavGraph(
     navController: NavHostController,
-    startDestination: Any = PostListRoute
+    startDestination: Any = PostListRoute,
+    snackBarState: SnackbarHostState
 ) {
     NavHost(
         navController = navController,
@@ -40,7 +42,8 @@ fun NavGraph(
                 },
                 onEditClick = { postId ->
                     navController.navigate(PostEditRoute(postId))
-                }
+                },
+                snackBarState = snackBarState
             )
         }
 
@@ -51,7 +54,8 @@ fun NavGraph(
                 },
                 onPostCreated = {
                     navController.popBackStack()
-                }
+                },
+                snackBarState = snackBarState
             )
         }
 
@@ -65,7 +69,8 @@ fun NavGraph(
                 },
                 onPostUpdated = {
                     navController.popBackStack()
-                }
+                },
+                snackBarState = snackBarState
             )
         }
     }

app/src/main/java/com/example/kuit6_android_api/ui/post/component/PostItem.kt

@@ -29,13 +29,13 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import coil.compose.AsyncImage
-import com.example.kuit6_android_api.data.model.Author
-import com.example.kuit6_android_api.data.model.Post
+import com.example.kuit6_android_api.data.model.response.AuthorResponse
+import com.example.kuit6_android_api.data.model.response.PostResponse
 import com.example.kuit6_android_api.util.formatDateTime
 
 @Composable
 fun PostItem(
-    post: Post,
+    post: PostResponse,
     onClick: () -> Unit
 ) {
     Card(
@@ -153,12 +153,12 @@ fun PostItem(
 fun PostItemPreview() {
     MaterialTheme {
         PostItem(
-            post = Post(
+            post = PostResponse(
                 id = 1,
                 title = "샘플 게시글 제목",
                 content = "이것은 샘플 게시글 내용입니다. 미리보기에서는 두 줄까지만 표시됩니다.",
                 imageUrl = null,
-                author = Author(1, "testuser", null),
+                author = AuthorResponse(1, "testuser", null),
                 createdAt = "2025-10-03T12:00:00",
                 updatedAt = "2025-10-03T12:00:00"
             ),