How to use Dependency Injection in an Android app?

Dependency Injection (DI) is a design pattern used to improve the code structure and make it more modular and testable in Android applications. It helps in managing dependencies between classes, allowing for better code management and easier unit testing.

In Android, you can implement Dependency Injection using various frameworks such as Dagger, Hilt, or Koin. Below, we will demonstrate a simple example using Hilt, a popular DI framework for Android.


    // Step 1: Add Hilt dependencies in your build.gradle file
    dependencies {
        implementation 'com.google.dagger:hilt-android:2.x'
        kapt 'com.google.dagger:hilt-compiler:2.x'
    }

    // Step 2: Apply the Hilt plugin
    apply plugin: 'dagger.hilt.android.plugin'

    // Step 3: Create an Application class
    @HiltAndroidApp
    class MyApplication : Application()

    // Step 4: Create a module to provide dependencies
    @Module
    @InstallIn(SingletonComponent::class)
    object NetworkModule {
        @Provides
        @Singleton
        fun provideRetrofit(): Retrofit {
            return Retrofit.Builder()
                .baseUrl("https://api.example.com")
                .addConverterFactory(GsonConverterFactory.create())
                .build()
        }
    }

    // Step 5: Inject dependencies into an Activity
    @AndroidEntryPoint
    class MainActivity : AppCompatActivity() {
        @Inject lateinit var retrofit: Retrofit

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)

            // Use the injected retrofit instance
        }
    }

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How to use Dependency Injection in an Android app?

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How to use Dependency Injection in an Android app?

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