migration: dagger to hilt

Author: dush1729

app/build.gradle.kts

@@ -2,6 +2,7 @@ plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
     id("kotlin-kapt")
+    id("com.google.dagger.hilt.android")
 }
 
 android {
@@ -60,14 +61,14 @@ dependencies {
     implementation(libs.retrofit)
     implementation(libs.converter.gson)
 
-    implementation(libs.dagger)
-    kapt(libs.dagger.compiler)
-
     implementation(libs.androidx.room.runtime)
     kapt(libs.androidx.room.compiler)
     implementation(libs.androidx.room.ktx)
 
     implementation(libs.androidx.lifecycle.viewmodel.ktx)
 
     implementation(libs.coil)
+
+    implementation(libs.hilt.android)
+    kapt(libs.hilt.compiler)
 }

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

@@ -2,6 +2,7 @@ package com.example.cfseeker
 
 import android.os.Bundle
 import androidx.activity.enableEdgeToEdge
+import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
@@ -10,21 +11,18 @@ import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.repeatOnLifecycle
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.example.cfseeker.databinding.ActivityMainBinding
-import com.example.cfseeker.di.component.DaggerActivityComponent
-import com.example.cfseeker.di.module.ActivityModule
 import com.example.cfseeker.ui.UserAdapter
 import com.example.cfseeker.ui.UserViewModel
 import com.example.cfseeker.ui.base.UiState
+import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.launch
-import javax.inject.Inject
 
+@AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
-    @Inject
-    lateinit var viewModel: UserViewModel
+    private val viewModel: UserViewModel by viewModels()
     private lateinit var binding: ActivityMainBinding
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        injectDependencies()
         enableEdgeToEdge()
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
@@ -58,13 +56,4 @@ class MainActivity : AppCompatActivity() {
             }
         }
     }
-
-    private fun injectDependencies() {
-        DaggerActivityComponent
-            .builder()
-            .activityModule(ActivityModule(this))
-            .applicationComponent((application as MyApplication).applicationComponent)
-            .build()
-            .inject(this)
-    }
 }

app/src/main/java/com/example/cfseeker/MyApplication.kt

@@ -1,18 +1,7 @@
 package com.example.cfseeker
 
 import android.app.Application
-import com.example.cfseeker.di.component.ApplicationComponent
-import com.example.cfseeker.di.component.DaggerApplicationComponent
-import com.example.cfseeker.di.module.ApplicationModule
+import dagger.hilt.android.HiltAndroidApp
 
-class MyApplication: Application() {
-    lateinit var applicationComponent: ApplicationComponent
-    override fun onCreate() {
-        super.onCreate()
-        applicationComponent = DaggerApplicationComponent
-            .builder()
-            .applicationModule(ApplicationModule(this))
-            .build()
-        applicationComponent.inject(this)
-    }
-}
+@HiltAndroidApp
+class MyApplication: Application()

app/src/main/java/com/example/cfseeker/di/component/ActivityComponent.kt

@@ -1,19 +1,23 @@
 package com.example.cfseeker.di.module
 
+import android.content.Context
 import androidx.room.Room
-import com.example.cfseeker.MyApplication
 import com.example.cfseeker.data.local.AppDatabase
 import com.example.cfseeker.data.local.AppDatabaseService
 import com.example.cfseeker.data.local.DatabaseService
 import com.example.cfseeker.data.remote.api.NetworkService
 import dagger.Module
 import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
 import retrofit2.Retrofit
 import retrofit2.converter.gson.GsonConverterFactory
 import javax.inject.Singleton
 
 @Module
-class ApplicationModule(private val application: MyApplication) {
+@InstallIn(SingletonComponent::class)
+object ApplicationModule {
     @Singleton
     @Provides
     fun provideNetworkService(): NetworkService {
@@ -27,9 +31,9 @@ class ApplicationModule(private val application: MyApplication) {
 
     @Singleton
     @Provides
-    fun provideAppDatabase(): AppDatabase {
+    fun provideAppDatabase(@ApplicationContext context: Context): AppDatabase {
         return Room.databaseBuilder(
-            application.applicationContext,
+            context,
             AppDatabase::class.java,
             "app_database")
             .build()

app/src/main/java/com/example/cfseeker/di/component/ApplicationComponent.kt

@@ -2,11 +2,10 @@ package com.example.cfseeker.ui
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import com.example.cfseeker.data.local.entity.RatingChangeEntity
-import com.example.cfseeker.data.local.entity.UserEntity
 import com.example.cfseeker.data.local.entity.UserRatingChanges
 import com.example.cfseeker.data.repository.UserRepository
 import com.example.cfseeker.ui.base.UiState
+import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
@@ -15,6 +14,7 @@ import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
+@HiltViewModel
 class UserViewModel @Inject constructor(
     private val repository: UserRepository,
 ): ViewModel() {