How to integrate Dagger 2 with other Android components?

Dagger 2 is a popular dependency injection framework for Android. Integrating Dagger 2 with other Android components, such as Activities, Fragments, and Services, allows for better code organization and easier management of dependencies.

Integrating Dagger 2 with Activities

To integrate Dagger 2 with an Activity, follow these steps:

Create a Component interface that includes your Activity as a module.
Use the @Inject annotation in your Activity to specify the dependencies you need.
Call the Dagger component to inject the dependencies in your Activity's onCreate() method.

Example:


        @Module
        class MainActivityModule {
            @Provides
            fun provideGreeting(): String {
                return "Hello, Dagger!"
            }
        }

        @Component(modules = [MainActivityModule::class])
        interface MainActivityComponent {
            fun inject(activity: MainActivity)
        }

        class MainActivity : AppCompatActivity() {
            @Inject lateinit var greeting: String

            override fun onCreate(savedInstanceState: Bundle?) {
                super.onCreate(savedInstanceState)
                DaggerMainActivityComponent.create().inject(this)
                Toast.makeText(this, greeting, Toast.LENGTH_SHORT).show()
            }
        }

Integrating Dagger 2 with Fragments

The integration process for Fragments is similar:

Create a Fragment component and module.
Inject dependencies in the Fragment using @Inject.
Use the Dagger component to inject in the Fragment's onCreateView() method.

Example:


        @Module
        class FragmentModule {
            @Provides
            fun provideDependency(): SomeDependency {
                return SomeDependency()
            }
        }

        @Component(modules = [FragmentModule::class])
        interface FragmentComponent {
            fun inject(fragment: MyFragment)
        }

        class MyFragment : Fragment() {
            @Inject lateinit var dependency: SomeDependency

            override fun onCreateView(
                inflater: LayoutInflater,
                container: ViewGroup?,
                savedInstanceState: Bundle?
            ): View? {
                DaggerFragmentComponent.create().inject(this)
                // Use dependency...
                return inflater.inflate(R.layout.fragment_layout, container, false)
            }
        }

Dagger 2 Dependency Injection Android Integration Activities Fragments Components

How to integrate Dagger 2 with other Android components?

Integrating Dagger 2 with Activities

Example:

Integrating Dagger 2 with Fragments

Example:

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How to integrate Dagger 2 with other Android components?

Integrating Dagger 2 with Activities

Example:

Integrating Dagger 2 with Fragments

Example:

Related Questions

Popular Topics

Recent Languages