feat: intercept onUserLeaveHint in WakeUpActivity to block Home and Recent buttons

Author: arinadi

app/src/main/java/com/hotbell/radio/ui/wakeup/WakeUpActivity.kt

@@ -14,12 +14,15 @@ import androidx.core.view.WindowCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
 import android.view.KeyEvent
+import androidx.activity.viewModels
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.hotbell.radio.ui.theme.HotBellTheme
 import com.hotbell.radio.ui.theme.PitchBlack
 
 class WakeUpActivity : ComponentActivity() {
 
+    private val viewModel: WakeUpViewModel by viewModels()
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -37,8 +40,6 @@ class WakeUpActivity : ComponentActivity() {
         val targetPhotoPath = intent.getStringExtra("EXTRA_TARGET_PHOTO_PATH")
 
         setContent {
-            val viewModel: WakeUpViewModel = viewModel()
-            
             // Trigger playback on launch
             androidx.compose.runtime.LaunchedEffect(Unit) {
                 viewModel.startAlarm(this@WakeUpActivity, stationUuid, stationName, stationUrl)
@@ -118,4 +119,14 @@ class WakeUpActivity : ComponentActivity() {
             else -> super.onKeyUp(keyCode, event)
         }
     }
+
+    override fun onUserLeaveHint() {
+        super.onUserLeaveHint()
+        if (viewModel.isAlarmActive.value) {
+            // The user pressed Home or Recent Apps. Bring the activity back to the front immediately.
+            val i = android.content.Intent(this, WakeUpActivity::class.java)
+            i.addFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK or android.content.Intent.FLAG_ACTIVITY_SINGLE_TOP)
+            startActivity(i)
+        }
+    }
 }

app/src/main/java/com/hotbell/radio/ui/wakeup/WakeUpViewModel.kt

@@ -38,6 +38,9 @@ class WakeUpViewModel(application: Application) : AndroidViewModel(application)
     private val _isFallbackActive = MutableStateFlow(false)
     val isFallbackActive: StateFlow<Boolean> = _isFallbackActive.asStateFlow()
 
+    private val _isAlarmActive = MutableStateFlow(true)
+    val isAlarmActive: StateFlow<Boolean> = _isAlarmActive.asStateFlow()
+
     // Snooze config
     private var snoozeDurationMin = 5
     private var maxSnoozeCount = 3
@@ -230,6 +233,7 @@ class WakeUpViewModel(application: Application) : AndroidViewModel(application)
         _canSnooze.value = currentSnoozeCount < maxSnoozeCount
 
         android.util.Log.d("WakeUpViewModel", "Snoozing alarm ($currentSnoozeCount/$maxSnoozeCount) for $snoozeDurationMin min")
+        _isAlarmActive.value = false
 
         // Log snoozed event
         viewModelScope.launch {
@@ -281,6 +285,7 @@ class WakeUpViewModel(application: Application) : AndroidViewModel(application)
 
     fun dismissAlarm(onDismissed: () -> Unit) {
         android.util.Log.d("WakeUpViewModel", "Dismissing alarm")
+        _isAlarmActive.value = false
 
         // Log dismissed event with response time
         val responseTime = System.currentTimeMillis() - alarmFiredTime