How to inject application context in a repository with Hilt?

Question

I want to inject an application context into a repository class to create a room database instance inside the repository. I am using Hilt for dependency injection.

Can we use hilt for passing application context or do I have to manually pass it?

I am getting the following error:

[Dagger/MissingBinding] android.content.Context cannot be provided without an @Provides-annotated method. public abstract static class ApplicationC  implements ExartApplication_GeneratedInjector 

Answer 1

Just use @ApplicationContext annotation on your context parameter.

By annotating context with @ApplicationContext provided by Hilt, we don't need to create a provider for the application context.

import dagger.hilt.android.qualifiers.ApplicationContext  /* For hilt versions lower than v2.28.2 use ApplicationComponent instead of SingletonComponent. ApplicationComponent is deprecated and even removed in  some versions above v2.28.2 so better refactor it to SingletonComponent. */   @Module @InstallIn(SingletonComponent::class) class ProductionModule {      @Singleton     @Provides     fun provideAppDatabase(@ApplicationContext appContext: Context): AppDatabase {         return Room             .databaseBuilder(appContext, AppDatabase::class.java, AppDatabase.DB_NAME)             .build()     } } 

NOTE: In case you are tempted to pass activity context as a dependency, try to use application context or rethink your use-case. Passing activity context may lead to serious implications like memory leaks. Having said that, if you know what you are doing, use @ActivityContext annotation for passing the activity context. A possible use-case might be adapters.