네트워크 연결 상태 확인

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.INTERNET" />
 
     <application

android/app/src/main/java/com/ohdodok/catchytape/MainActivity.kt

@@ -1,13 +1,35 @@
 package com.ohdodok.catchytape
 
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED
 import android.os.Bundle
+import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import dagger.hilt.android.AndroidEntryPoint
+import com.ohdodok.catchytape.core.ui.R.string as uiString
 
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
+    private lateinit var connectivityManager: ConnectivityManager
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        connectivityManager = getSystemService(ConnectivityManager::class.java)
+        checkNetworkState()
+
+        val networkStateObserver = NetworkStateObserver(connectivityManager, ::checkNetworkState)
+        lifecycle.addObserver(networkStateObserver)
+    }
+
+    private fun checkNetworkState() {
+        val activeNetwork = connectivityManager.activeNetwork
+        val capabilities = connectivityManager.getNetworkCapabilities(activeNetwork)
+        val isNetworkAvailable = capabilities?.hasCapability(NET_CAPABILITY_VALIDATED) ?: false
+
+        if (!isNetworkAvailable) {
+            Toast.makeText(this, getString(uiString.check_network), Toast.LENGTH_LONG).show()
+        }
     }
 }

android/app/src/main/java/com/ohdodok/catchytape/NetworkStateObserver.kt

@@ -0,0 +1,29 @@
+package com.ohdodok.catchytape
+
+import android.net.ConnectivityManager
+import android.net.Network
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+
+class NetworkStateObserver(
+    private val connectivityManager: ConnectivityManager,
+    checkNetworkState: () -> Unit
+) : DefaultLifecycleObserver {
+
+    private val networkCallback = object : ConnectivityManager.NetworkCallback() {
+        override fun onLost(network: Network) {
+            super.onLost(network)
+            checkNetworkState()
+        }
+    }
+
+    override fun onResume(owner: LifecycleOwner) {
+        super.onResume(owner)
+        connectivityManager.registerDefaultNetworkCallback(networkCallback)
+    }
+
+    override fun onPause(owner: LifecycleOwner) {
+        super.onPause(owner)
+        connectivityManager.unregisterNetworkCallback(networkCallback)
+    }
+}

android/core/ui/src/main/res/values/strings.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <string name="check_network">네트워크 연결을 확인해 주세요.</string>
+
     <string name="home">홈</string>
     <string name="search">검색</string>
     <string name="playlist">재생목록</string>