CODEWITHSUNDEEP
androidkotlinmvvmviewmodeldagger-hilt
Feroz Khan
Feroz Khan

Reputation: 2846

@InstallIn, can only be used with @DefineComponent-annotated classes, but found: [com.abc.xyz.AppClass]

As per documentation for Hilt, I completed all the steps

Add Class Path to Project Module

classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"

Add Plugins

plugins {
    id "kotlin-kapt"
    id("dagger.hilt.android.plugin")
}

Add Dependencies

dependencies {
    implementation("com.google.dagger:hilt-android:$hilt_version")
    kapt("com.google.dagger:hilt-android-compiler:$hilt_version")
}

Annotated Application Class, in my case AppClass, with @HiltAndroidApp. Annotated Activity and regarding fragment with @AndroidEntryPoint.

Created Module as

@InstallIn(AppClass::class)
@Module
object DatabaseModule {

    @Provides
    @Singleton
    fun provideAppDB(application: Application): AppDB {
        return AppDB.getDatabase(application)
    }

    @Provides
    @Singleton
    fun provideMediaDao(appDB: AppDB): MediaDao {
        return appDB.downloadMediaDao()
    }
}

Injected it in ViewModel class as

@HiltViewModel
class DownloadViewModel @Inject constructor(
    private val mediaDao: MediaDao
): ViewModel() {
    ...
}

But After following all the steps I got the error saying "@InstallIn, can only be used with @DefineComponent-annotated classes, but found: [com.abc.xyz.AppClass]"

Upvotes: 8

Views: 5964

Answers (2)

Tonnie
Tonnie

Reputation: 8182

In my case, I made a career-ending error and I was duly punished by spending the whole day stuck on a simple typo!

Instead of using SingletonComponent::class I misspelt it as Singleton::class

//worst error of my career
@Module
@InstallIn(Singleton::class)
object AppModule { ... }

I changed to SingletonComponent::class and bypassed the error.

//changed it to this
@Module
@InstallIn(SingletonComponent::class)
object AppModule { ... }

Upvotes: 6

Feroz Khan
Feroz Khan

Reputation: 2846

As defined in the Codelab, I replaced this

@InstallIn(AppClass::class)

with this

@InstallIn(SingletonComponent::class)

And it's working.

Upvotes: 24

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