..

apps/app/android/app/build.gradle.kts

@@ -7,16 +7,20 @@ plugins {
 
 android {
     namespace = "com.playwith.playwith_app"
-    compileSdk = flutter.compileSdkVersion
+    compileSdk = 34
     ndkVersion = flutter.ndkVersion
 
+   // [수정할 부분]
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
+        // 기존 1.8 -> 17로 변경
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
+    // [수정할 부분]
     kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_11.toString()
+        // 기존 '1.8' -> '17'로 변경
+        jvmTarget = "17"
     }
 
     defaultConfig {
@@ -24,8 +28,11 @@ android {
         applicationId = "com.playwith.playwith_app"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
-        minSdk = flutter.minSdkVersion
-        targetSdk = flutter.targetSdkVersion
+        // [수정] 최소 SDK는 21 이상이면 됨
+        minSdk = flutter.minSdkVersion 
+        // [수정] 타겟 SDK도 34로 올림
+        targetSdk = 34
+        
         versionCode = flutter.versionCode
         versionName = flutter.versionName
     }

apps/app/android/app/src/main/AndroidManifest.xml

@@ -1,4 +1,20 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
+    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
+    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"/>
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
+    
+    <uses-permission android:name="android.permission.NEARBY_WIFI_DEVICES" />
+
+    <uses-permission android:name="android.permission.CAMERA"/>
+
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
+
     <application
         android:label="playwith_app"
         android:name="${applicationName}"
@@ -30,6 +46,12 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+
+        <meta-data
+            android:name="com.google.android.gms.ads.APPLICATION_ID"
+            android:value="ca-app-pub-9504446465764716~3452126047"
+            />
+
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and

apps/app/android/app/src/main/kotlin/com/playwith/playwith_app/MainActivity.kt

@@ -1,5 +1,43 @@
 package com.playwith.playwith_app
 
+import android.content.Context
+import android.net.wifi.WifiManager
+import android.os.Bundle
 import io.flutter.embedding.android.FlutterActivity
 
-class MainActivity : FlutterActivity()
+class MainActivity: FlutterActivity() {
+    // 멀티캐스트 잠금 객체
+    private var multicastLock: WifiManager.MulticastLock? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        acquireMulticastLock()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        releaseMulticastLock()
+    }
+
+    private fun acquireMulticastLock() {
+        try {
+            val wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
+            // "multicastLock" 태그로 잠금 생성
+            multicastLock = wifiManager.createMulticastLock("multicastLock")
+            multicastLock?.setReferenceCounted(true)
+            multicastLock?.acquire() // 잠금 활성화 (멀티캐스트 수신 허용)
+            println("[Android Native] Multicast Lock Acquired!")
+        } catch (e: Exception) {
+            println("[Android Native] Failed to acquire Multicast Lock: $e")
+        }
+    }
+
+    private fun releaseMulticastLock() {
+        try {
+            multicastLock?.release() // 잠금 해제
+            println("[Android Native] Multicast Lock Released!")
+        } catch (e: Exception) {
+            println("[Android Native] Failed to release Multicast Lock: $e")
+        }
+    }
+}

apps/app/android/build.gradle.kts

@@ -5,20 +5,20 @@ allprojects {
     }
 }
 
-val newBuildDir: Directory =
-    rootProject.layout.buildDirectory
-        .dir("../../build")
-        .get()
+// [핵심] 빌드 결과물 위치를 Flutter 표준 경로(../../build)로 변경
+// 이 코드가 없으면 Flutter가 APK를 찾지 못해 에러가 납니다.
+val newBuildDir: Directory = rootProject.layout.buildDirectory.dir("../../build").get()
 rootProject.layout.buildDirectory.value(newBuildDir)
 
 subprojects {
     val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name)
     project.layout.buildDirectory.value(newSubprojectBuildDir)
 }
+
 subprojects {
     project.evaluationDependsOn(":app")
 }
 
 tasks.register<Delete>("clean") {
     delete(rootProject.layout.buildDirectory)
-}
+}