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Hilt ‐ Scoping with @ActivityComponent annotation and @ActivityScoped provider

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Devrath edited this page Oct 9, 2023 · 2 revisions

Observation

  • Observe this is Activity scoped so when activity is destroyed and recreated the Instance is also destroyed and recreated.
  • Once created unless activity is destroyed, The address of instance remains same.

Output

// When activity is loaded for the first time DownloaderService class is built // Click on the Button to call the injected reference in activity for the first time Reference address:-> 204776435 // Click on the Button to call the injected reference in activity for the second time Reference address:-> 204776435 // When you rotate the screen DownloaderService class is built // Click on the Button to call the injected reference in activity for the third time Reference address:-> 65550570

Implementations

DownloaderService.kt

class DownloaderService @Inject constructor(){ init { PrintUtils.printLog("DownloaderService class is built") } fun downloadData(data : String) { PrintUtils.printLog("Reference address:-> $data") } }

Modules

HiltActivityScopingModule.kt

@InstallIn(ActivityComponent::class) @Module object HiltActivityScopingModule { @ActivityScoped @Provides fun providesDownloader() : DownloaderService { return DownloaderService() } }

Activity

MyActivity.kt

@AndroidEntryPoint class MyActivity : AppCompatActivity() { private lateinit var binding: ActivityHiltScopingBinding @Inject lateinit var downloaderService : DownloaderService override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityHiltScopingBinding.inflate(layoutInflater) setContentView(binding.root) setOnClickListeners(); } private fun setOnClickListeners() { binding.apply { actScopedWithActivityAnnotationId.setOnClickListener { val code = downloaderService.hashCode().toString() downloaderService.downloadData(code) } } } }
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