Я впервые играю с Hilt. Я создал демонстрационное приложение с BottomNavigationView
. Я добавил @AndroidEntryPoint
и @HiltAndroidApp
. Я создал класс Module и ввел ViewModel, но все равно получаю одну и ту же ошибку снова и снова.
Class <ViewModel> has no zero argument constructor
Некоторый код:
@HiltAndroidApp
class MyApplication: Application() {
}
<application
android:name=".MyApplication"
@AndroidEntryPoint
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val navView: BottomNavigationView = findViewById(R.id.nav_view)
val navController = findNavController(R.id.nav_host_fragment)
navView.setupWithNavController(navController)
}
}
@AndroidEntryPoint
class CampaignsFragment : Fragment() {
private var _binding: FragmentCampaignsBinding? = null
private val binding get() = _binding!!
private val campaignsViewModel: CampaignsViewModel by navGraphViewModels(R.id.mobile_navigation) {
defaultViewModelProviderFactory
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
_binding = FragmentCampaignsBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
campaignsViewModel.getCampaigns()
}
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
}
class CampaignsViewModel @ViewModelInject constructor(
private val db: FirebaseFirestore,
@Assisted private val savedStateHandle: SavedStateHandle
): ViewModel() {
fun getCampaigns() {
db.collection("campaigns")
.get()
.addOnSuccessListener {
for (document in it) {
Log.d(BuildConfig.BUILD_TYPE, "${document.id} => ${document.data}")
}
}
.addOnFailureListener {
}
}
}
@Module
@InstallIn(FragmentComponent::class)
class ApplicationModule {
@Provides
fun provideFirebaseFirestore(): FirebaseFirestore {
return Firebase.firestore
}
}
Я добавил весь код, который использую. Я что-то упускаю? Я не смог найти ни одного примера или отсутствующих ошибок. Я прочитал документацию по рукоятке о ViewModel и ее реализации.
содержимое файла приложения gradle:
plugins {
id 'com.android.application'
id 'kotlin-android'
id 'com.google.gms.google-services'
id 'kotlin-android-extensions'
id 'kotlin-kapt'
id 'dagger.hilt.android.plugin'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.2"
defaultConfig {
applicationId "ro.marianpavel.partidulverde"
minSdkVersion 21
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
buildFeatures {
viewBinding true
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.1'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.1'
implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.2.0'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.1'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.1'
implementation platform('com.google.firebase:firebase-bom:25.12.0')
implementation 'com.google.firebase:firebase-analytics-ktx'
implementation 'com.google.firebase:firebase-firestore-ktx'
testImplementation 'junit:junit:4.13.1'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
implementation "com.google.dagger:hilt-android:2.29-alpha"
implementation 'androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha02'
kapt "com.google.dagger:hilt-android-compiler:2.29-alpha"
}