comments added

Code/StopwatchServiceApp/app/src/main/java/com/istudio/app/MainActivity.kt

@@ -19,45 +19,97 @@ import com.istudio.app.service.StopwatchService
 import com.istudio.app.ui.theme.StopWatchServiceAppTheme
 import dagger.hilt.android.AndroidEntryPoint
 
+
+/**
+ * 1) Why we have used bound service ?
+ * --> We have used bound service because, When application is destroyed & recreated when we start timer and kill activity. Once we reopen app, it has to be updated so bound service helps us achieve it.
+ *
+ */
+
 @OptIn(ExperimentalAnimationApi::class)
 @ExperimentalAnimationApi
 @AndroidEntryPoint
 class MainActivity : ComponentActivity() {
 
+ // We Keep "isBound" Flag keep track when the service is connected/disconnected
  private var isBound by mutableStateOf(false)
+ // Reference to the service used to display the stop clock
  private lateinit var stopwatchService: StopwatchService
- private val connection = object : ServiceConnection {
- override fun onServiceConnected(className: ComponentName, service: IBinder) {
- val binder = service as StopwatchService.StopwatchBinder
- stopwatchService = binder.getService()
- isBound = true
- }
 
- override fun onServiceDisconnected(arg0: ComponentName) {
- isBound = false
- }
+ /** ********************** Life-Cycle-Methods ********************** **/
+ override fun onCreate(savedInstanceState: Bundle?) {
+ super.onCreate(savedInstanceState)
+ initOnCreate()
  }
 
  override fun onStart() {
  super.onStart()
- Intent(this, StopwatchService::class.java).also { intent ->
- bindService(intent, connection, Context.BIND_AUTO_CREATE)
- }
+ initOnStart()
  }
 
- override fun onCreate(savedInstanceState: Bundle?) {
- super.onCreate(savedInstanceState)
+ override fun onStop() {
+ super.onStop()
+ initOnStop()
+ }
+ /** ********************** Life-Cycle-Methods ********************** **/
+
+
+ /** ********************** Init-Methods **************************** **/
+ private fun initOnCreate() {
  setContent {
  StopWatchServiceAppTheme {
  if (isBound) {
+ // Only if the service is connected, Then show the UI
  MainScreen(stopwatchService = stopwatchService)
  }
  }
  }
  requestPermissions(Manifest.permission.POST_NOTIFICATIONS)
  }
 
+ private fun initOnStart() {
+ // Bind the service
+ Intent(this, StopwatchService::class.java).also { intent ->
+ bindService(intent, connection, BIND_AUTO_CREATE)
+ }
+ }
+
+ private fun initOnStop() {
+ // Unbind the service
+ unbindService(connection)
+ // Update the flag that service is unbinded
+ isBound = false
+ }
+ /** ********************** Init-Methods **************************** **/
+
+
+ /** ********************** Other Functions ************************* **/
+ /**
+ * Initialize the service
+ * StartService:-> To be done in OnStart
+ * StartService:-> TO be done in OnDestroy
+ */
+ private val connection = object : ServiceConnection {
+
+ override fun onServiceConnected(className: ComponentName, service: IBinder) {
+ // We get the binder instance
+ val binder = service as StopwatchService.StopwatchBinder
+ // Using the binder, We get the instance of the service to handle and control it
+ stopwatchService = binder.getService()
+ isBound = true
+ }
+
+ override fun onServiceDisconnected(arg0: ComponentName) {
+ isBound = false
+ }
+ }
+
+
+ /**
+ * Request permission to display the notification
+ */
  private fun requestPermissions(vararg permissions: String) {
+
  val requestPermissionLauncher = registerForActivityResult(
  ActivityResultContracts.RequestMultiplePermissions()
  ) { result ->
@@ -67,10 +119,6 @@ class MainActivity : ComponentActivity() {
  }
  requestPermissionLauncher.launch(permissions.asList().toTypedArray())
  }
+ /** ********************** Other Functions ************************* **/
 
- override fun onStop() {
- super.onStop()
- unbindService(connection)
- isBound = false
- }
 }

Code/StopwatchServiceApp/app/src/main/java/com/istudio/app/service/StopwatchService.kt

@@ -7,11 +7,9 @@ import android.app.Service
 import android.content.Intent
 import android.os.Binder
 import android.os.Build
-import android.os.IBinder
 import androidx.compose.animation.ExperimentalAnimationApi
 import androidx.compose.runtime.mutableStateOf
 import androidx.core.app.NotificationCompat
-import com.istudio.app.R
 import com.istudio.app.util.Constants.ACTION_SERVICE_CANCEL
 import com.istudio.app.util.Constants.ACTION_SERVICE_START
 import com.istudio.app.util.Constants.ACTION_SERVICE_STOP