adding DepedencyInjnection with HILT

app/build.gradle.kts

@@ -2,6 +2,12 @@ plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
     id("androidx.navigation.safeargs.kotlin")
+    id("kotlin-kapt")
+    id("com.google.dagger.hilt.android")
+}
+
+kapt {
+    correctErrorTypes = true
 }
 
 android {
@@ -11,6 +17,12 @@ android {
     lint {
         abortOnError = false
     }
+    
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
 
     defaultConfig {
         applicationId = "com.mattintech.lchat"
@@ -50,6 +62,7 @@ android {
     }
     buildFeatures {
         viewBinding = true
+        buildConfig = true
     }
 }
 
@@ -66,6 +79,10 @@ dependencies {
     implementation("androidx.navigation:navigation-fragment-ktx:2.7.6")
     implementation("androidx.navigation:navigation-ui-ktx:2.7.6")
     
+    // Hilt dependencies
+    implementation("com.google.dagger:hilt-android:2.50")
+    kapt("com.google.dagger:hilt-compiler:2.50")
+    
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")

app/proguard-rules.pro

@@ -11,4 +11,17 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
+#-renamesourcefileattribute SourceFile
+
+# Keep Application class
+-keep class com.mattintech.lchat.LChatApplication { *; }
+
+# Hilt rules
+-keep class dagger.hilt.** { *; }
+-keep class javax.inject.** { *; }
+-keep class * extends dagger.hilt.android.internal.managers.ViewComponentManager { *; }
+
+# Keep all @HiltAndroidApp, @AndroidEntryPoint, @HiltViewModel annotated classes
+-keep @dagger.hilt.android.HiltAndroidApp class * { *; }
+-keep @dagger.hilt.android.AndroidEntryPoint class * { *; }
+-keep @dagger.hilt.android.lifecycle.HiltViewModel class * { *; }

app/src/main/AndroidManifest.xml

@@ -15,6 +15,7 @@
     <uses-feature android:name="android.hardware.wifi.aware" android:required="true" />
 
     <application
+        android:name=".LChatApplication"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"

app/src/main/java/com/mattintech/lchat/LChatApplication.kt

@@ -0,0 +1,11 @@
+package com.mattintech.lchat
+
+import android.app.Application
+import dagger.hilt.android.HiltAndroidApp
+
+@HiltAndroidApp
+class LChatApplication : Application() {
+    override fun onCreate() {
+        super.onCreate()
+    }
+}

app/src/main/java/com/mattintech/lchat/MainActivity.kt

@@ -11,7 +11,9 @@ import androidx.core.content.ContextCompat
 import com.google.android.material.snackbar.Snackbar
 import com.mattintech.lchat.databinding.ActivityMainBinding
 import com.mattintech.lchat.utils.LOG_PREFIX
+import dagger.hilt.android.AndroidEntryPoint
 
+@AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
     
     companion object {

app/src/main/java/com/mattintech/lchat/di/AppModule.kt

@@ -0,0 +1,23 @@
+package com.mattintech.lchat.di
+
+import android.content.Context
+import com.mattintech.lchat.network.WifiAwareManager
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+object AppModule {
+    
+    @Provides
+    @Singleton
+    fun provideWifiAwareManager(
+        @ApplicationContext context: Context
+    ): WifiAwareManager {
+        return WifiAwareManager(context)
+    }
+}

app/src/main/java/com/mattintech/lchat/repository/ChatRepository.kt

@@ -3,24 +3,19 @@ package com.mattintech.lchat.repository
 import android.content.Context
 import com.mattintech.lchat.data.Message
 import com.mattintech.lchat.network.WifiAwareManager
+import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import java.util.UUID
+import javax.inject.Inject
+import javax.inject.Singleton
 
-class ChatRepository private constructor(context: Context) {
+@Singleton
-    
+class ChatRepository @Inject constructor(
-    companion object {
+    @ApplicationContext private val context: Context
-        @Volatile
+) {
-        private var INSTANCE: ChatRepository? = null
-        
-        fun getInstance(context: Context): ChatRepository {
-            return INSTANCE ?: synchronized(this) {
-                INSTANCE ?: ChatRepository(context.applicationContext).also { INSTANCE = it }
-            }
-        }
-    }
     
     private val wifiAwareManager = WifiAwareManager(context)
     
@@ -140,7 +135,7 @@ class ChatRepository private constructor(context: Context) {
     
     private fun startConnectionMonitoring() {
         connectionCheckJob?.cancel()
-        connectionCheckJob = GlobalScope.launch {
+        connectionCheckJob = CoroutineScope(Dispatchers.IO).launch {
             while (isActive) {
                 delay(5000) // Check every 5 seconds
                 val timeSinceLastActivity = System.currentTimeMillis() - lastActivityTime

app/src/main/java/com/mattintech/lchat/ui/ChatFragment.kt

@@ -6,7 +6,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
-import androidx.lifecycle.ViewModelProvider
+import androidx.fragment.app.viewModels
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.navArgs
 import androidx.core.content.ContextCompat
@@ -17,9 +17,10 @@ import com.mattintech.lchat.repository.ChatRepository
 import com.mattintech.lchat.ui.adapters.MessageAdapter
 import com.mattintech.lchat.utils.LOG_PREFIX
 import com.mattintech.lchat.viewmodel.ChatViewModel
-import com.mattintech.lchat.viewmodel.ViewModelFactory
+import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.launch
 
+@AndroidEntryPoint
 class ChatFragment : Fragment() {
     
     companion object {
@@ -30,7 +31,7 @@ class ChatFragment : Fragment() {
     private val binding get() = _binding!!
     
     private val args: ChatFragmentArgs by navArgs()
-    private lateinit var viewModel: ChatViewModel
+    private val viewModel: ChatViewModel by viewModels()
     private lateinit var messageAdapter: MessageAdapter
     
     override fun onCreateView(
@@ -47,8 +48,6 @@ class ChatFragment : Fragment() {
         super.onViewCreated(view, savedInstanceState)
         Log.d(TAG, "onViewCreated - room: ${args.roomName}, user: ${args.userName}, isHost: ${args.isHost}")
         
-        val factory = ViewModelFactory(requireContext())
-        viewModel = ViewModelProvider(this, factory)[ChatViewModel::class.java]
         viewModel.initialize(args.roomName, args.userName, args.isHost)
         
         setupUI()

app/src/main/java/com/mattintech/lchat/ui/LobbyFragment.kt

@@ -7,16 +7,17 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Toast
 import androidx.fragment.app.Fragment
-import androidx.lifecycle.ViewModelProvider
+import androidx.fragment.app.viewModels
 import androidx.navigation.fragment.findNavController
 import com.mattintech.lchat.R
 import com.mattintech.lchat.databinding.FragmentLobbyBinding
 import com.mattintech.lchat.viewmodel.LobbyEvent
 import com.mattintech.lchat.viewmodel.LobbyState
 import com.mattintech.lchat.viewmodel.LobbyViewModel
-import com.mattintech.lchat.viewmodel.ViewModelFactory
 import com.mattintech.lchat.utils.LOG_PREFIX
+import dagger.hilt.android.AndroidEntryPoint
 
+@AndroidEntryPoint
 class LobbyFragment : Fragment() {
     
     companion object {
@@ -26,7 +27,7 @@ class LobbyFragment : Fragment() {
     private var _binding: FragmentLobbyBinding? = null
     private val binding get() = _binding!!
     
-    private lateinit var viewModel: LobbyViewModel
+    private val viewModel: LobbyViewModel by viewModels()
     
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -42,9 +43,6 @@ class LobbyFragment : Fragment() {
         super.onViewCreated(view, savedInstanceState)
         Log.d(TAG, "onViewCreated")
         
-        val factory = ViewModelFactory(requireContext())
-        viewModel = ViewModelProvider(this, factory)[LobbyViewModel::class.java]
-        
         setupUI()
         observeViewModel()
     }

app/src/main/java/com/mattintech/lchat/viewmodel/ChatViewModel.kt

@@ -6,11 +6,13 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.mattintech.lchat.data.Message
 import com.mattintech.lchat.repository.ChatRepository
+import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import java.util.UUID
+import javax.inject.Inject
 
 sealed class ChatState {
     object Connected : ChatState()
@@ -18,7 +20,8 @@ sealed class ChatState {
     data class Error(val message: String) : ChatState()
 }
 
-class ChatViewModel(
+@HiltViewModel
+class ChatViewModel @Inject constructor(
     private val chatRepository: ChatRepository
 ) : ViewModel() {
     

app/src/main/java/com/mattintech/lchat/viewmodel/LobbyViewModel.kt

@@ -5,7 +5,9 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.mattintech.lchat.repository.ChatRepository
+import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.launch
+import javax.inject.Inject
 
 sealed class LobbyState {
     object Idle : LobbyState()
@@ -23,7 +25,8 @@ sealed class LobbyEvent {
     data class ShowError(val message: String) : LobbyEvent()
 }
 
-class LobbyViewModel(
+@HiltViewModel
+class LobbyViewModel @Inject constructor(
     private val chatRepository: ChatRepository
 ) : ViewModel() {
     

app/src/main/java/com/mattintech/lchat/viewmodel/ViewModelFactory.kt

@@ -1,24 +0,0 @@
-package com.mattintech.lchat.viewmodel
-
-import android.content.Context
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.ViewModelProvider
-import com.mattintech.lchat.repository.ChatRepository
-
-class ViewModelFactory(private val context: Context) : ViewModelProvider.Factory {
-    
-    private val chatRepository by lazy { ChatRepository.getInstance(context) }
-    
-    @Suppress("UNCHECKED_CAST")
-    override fun <T : ViewModel> create(modelClass: Class<T>): T {
-        return when {
-            modelClass.isAssignableFrom(LobbyViewModel::class.java) -> {
-                LobbyViewModel(chatRepository) as T
-            }
-            modelClass.isAssignableFrom(ChatViewModel::class.java) -> {
-                ChatViewModel(chatRepository) as T
-            }
-            else -> throw IllegalArgumentException("Unknown ViewModel class: ${modelClass.name}")
-        }
-    }
-}

build.gradle.kts

@@ -11,5 +11,6 @@ buildscript {
 
 plugins {
     id("com.android.application") version "8.9.1" apply false
-    id("org.jetbrains.kotlin.android") version "1.9.0" apply false
+    id("org.jetbrains.kotlin.android") version "1.9.22" apply false
+    id("com.google.dagger.hilt.android") version "2.50" apply false
 }

gradle.properties

@@ -1,6 +1,12 @@
 # Project-wide Gradle settings.
-org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8 --add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED
 android.useAndroidX=true
 android.nonTransitiveRClass=true
-android.defaults.buildfeatures.buildconfig=true
+android.nonFinalResIds=false
-android.nonFinalResIds=false
+
+# Kapt configuration for better performance
+kapt.use.worker.api=true
+kapt.incremental.apt=true
+
+# Hilt configuration
+dagger.hilt.android.internal.disableAndroidSuperclassValidation=true