design pattern

frontend/app/src/main/java/com/team13/fooriend/ui/navigation/BottomNavItem.kt

@@ -27,7 +27,7 @@ sealed class BottomNavItem( // Bottom Navigation Bar에 들어갈 아이템들
     )
     object Social: BottomNavItem(
         title = "Social",
-        icon = FooriendIcon.Social,
+        icon = Icons.Default.Search,
         route = "social"
     )
     object MyPage: BottomNavItem(

frontend/app/src/main/java/com/team13/fooriend/ui/screen/PostingScreen.kt

@@ -48,14 +48,10 @@ import androidx.compose.material.icons.filled.Store
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.TextFieldDefaults
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.text.TextStyle
-import androidx.compose.ui.text.font.FontStyle
-import androidx.compose.ui.text.input.PasswordVisualTransformation
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.style.TextAlign
@@ -117,6 +113,11 @@ fun PostingScreen(
 
     var contentState by remember { mutableStateOf(TextFieldValue("")) }
 
+    val reviewCountManager = ReviewCountManager()
+    val toastObserver = ToastObserver(context)
+
+    reviewCountManager.addObserver(toastObserver)
+
     Column(
         modifier = Modifier
             .verticalScroll(state)
@@ -341,6 +342,7 @@ fun PostingScreen(
                 coroutineScope.launch {
                     Log.d("PostingScreen", "restaurantPlaceId: $restaurantPlaceId")
                     val response = placesApi.getPlaceDetails(placeId = restaurantPlaceId, apiKey = "AIzaSyDV4YwwZmJp1PHNO4DSp_BdgY4qCDQzKH0")
+                    var myReviewCount = apiService.getMyReviews().reviewList.size
                     Log.d("PostingScreen", "restaurant: $response")
                     val restaurant = RestaurantInfo(
                         googleMapPlaceId = restaurantPlaceId,
@@ -391,8 +393,11 @@ fun PostingScreen(
                             restaurant = restaurant
                         )
                     )
-                    Toast.makeText(context, "리뷰가 등록되었습니다.", Toast.LENGTH_SHORT).show()
                     onPostClick()
+                    Toast.makeText(context, "리뷰가 등록되었습니다.", Toast.LENGTH_SHORT).show()
+                    reviewCountManager.updateReviewCount(myReviewCount+1)
+                }
+            },
                     }
                 },
                 modifier = Modifier

frontend/app/src/main/java/com/team13/fooriend/ui/screen/ReviewCountObserver.kt

@@ -0,0 +1,46 @@
+package com.team13.fooriend.ui.screen
+
+import android.content.Context
+import android.widget.Toast
+
+interface ReviewCountSubject {
+    fun addObserver(observer: ReviewCountObserver)
+    fun removeObserver(observer: ReviewCountObserver)
+    fun notifyObservers()
+}
+
+class ReviewCountManager : ReviewCountSubject {
+    private val observers: MutableList<ReviewCountObserver> = ArrayList()
+    private var myReviewCount: Int = 0
+
+    fun updateReviewCount(count: Int) {
+        myReviewCount = count
+        if (myReviewCount % 3 == 0 && myReviewCount > 0) {
+            notifyObservers()
+        }
+    }
+
+    override fun addObserver(observer: ReviewCountObserver) {
+        observers.add(observer)
+    }
+
+    override fun removeObserver(observer: ReviewCountObserver) {
+        observers.remove(observer)
+    }
+
+    override fun notifyObservers() {
+        for (observer in observers) {
+            observer.update(myReviewCount)
+        }
+    }
+}
+
+interface ReviewCountObserver {
+    fun update(reviewCount: Int)
+}
+
+class ToastObserver(private val context: Context) : ReviewCountObserver {
+    override fun update(reviewCount: Int) {
+        Toast.makeText(context, "리뷰가 $reviewCount 개 등록되었습니다. 축하드립니다", Toast.LENGTH_SHORT).show()
+    }
+}

frontend/app/src/main/java/com/team13/fooriend/ui/screen/social/SocialScreen.kt

@@ -167,7 +167,7 @@ fun SocialSearchBar(
             active = it
         },
         placeholder = {
-            Text(text = "Search User", fontSize = 15.sp)
+            Text(text = "친구를 이름으로 검색", fontSize = 15.sp)
         },
         leadingIcon = {
             Icon(imageVector = Icons.Default.Search, contentDescription = "Search Icon")