Wear SIP: incoming-call alert (full-screen intent + screen wake + vibrate)

- High-importance (IMPORTANCE_MAX) call channel; on incoming call post a
  PRIORITY_MAX / CATEGORY_CALL notification with a full-screen intent that
  launches the InCallScreen over the watch face.
- MainActivity: setShowWhenLocked/setTurnScreenOn + FLAG_SHOW_WHEN_LOCKED
  so the in-call UI presents over the dimmed screen / keyguard.
- Request POST_NOTIFICATIONS at runtime (API 33+ silently drops
  notifications without it) alongside RECORD_AUDIO.
- Vibration ring pattern + wake-lock on incoming call; dismiss the
  heads-up when the call closes.

Note: on Samsung Galaxy Watch the watch notification manager blocks
alerting for apps not in its allowed-notifications list; the device
setting (Settings > Notifications > App notifications > Baresip Wear)
must be enabled for the heads-up to fire. Foreground/app-open case
verified working (call answered, audio -> onboard speaker).

wear/src/main/java/com/tutpro/baresip/wear/MainActivity.kt

@@ -49,15 +49,41 @@ class MainActivity : ComponentActivity() {
     private val recordAudioPermission = registerForActivityResult(
         ActivityResultContracts.RequestPermission()
     ) { granted ->
-        if (granted) startBaresipService() else CallState.status.value = "Mic permission denied"
+        if (granted) {
+            startBaresipService()
+            // On API 33+ notifications are silently dropped unless the user
+            // grants POST_NOTIFICATIONS -- required for the incoming-call
+            // heads-up (full-screen intent) to wake the watch face.
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU &&
+                ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS)
+                != PackageManager.PERMISSION_GRANTED
+            ) {
+                postNotificationPermission.launch(Manifest.permission.POST_NOTIFICATIONS)
+            }
+        } else {
+            CallState.status.value = "Mic permission denied"
+        }
     }
 
+    private val postNotificationPermission = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { /* best-effort; incoming alert still works if already granted */ }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContent {
             WearApp(this)
         }
 
+        // If we were launched by an incoming-call alert (full-screen intent),
+        // turn the screen on and show over the lock screen, and jump straight
+        // to the in-call UI.
+        if (intent?.getBooleanExtra("incoming_call", false) == true) {
+            android.util.Log.d("Baresip Wear", "onCreate: incoming_call extra seen -> incall")
+            turnScreenOnForCall()
+            route.value = "incall"
+        }
+
         if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO)
             == PackageManager.PERMISSION_GRANTED
         ) {
@@ -69,8 +95,46 @@ class MainActivity : ComponentActivity() {
 
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
+        this.intent = intent
         if (intent.action == Intent.ACTION_VIEW && intent.data?.scheme == "baresip") {
             handleProvisioningIntent(intent)
+        } else if (intent.getBooleanExtra("incoming_call", false)) {
+            // Launched from the full-screen call intent while already running.
+            android.util.Log.d("Baresip Wear", "onNewIntent: incoming_call extra seen -> incall")
+            turnScreenOnForCall()
+            route.value = "incall"
+        }
+    }
+
+    /** Wake the screen and present over the lock screen for an incoming call. */
+    @Suppress("DEPRECATION")
+    private fun turnScreenOnForCall() {
+        try {
+            // Modern, reliable way to raise an incoming-call UI over the watch
+            // face / keyguard (API 27+). These are the APIs designed for exactly
+            // this (alarm / incoming-call) use case.
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+                setShowWhenLocked(true)
+                setTurnScreenOn(true)
+            }
+            val wm = getSystemService(android.view.WindowManager::class.java)
+            val params = window.attributes
+            params.flags = params.flags or
+                android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON or
+                android.view.WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON or
+                android.view.WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
+            window.attributes = params
+            val pm = getSystemService(android.os.PowerManager::class.java)
+            if (pm != null && !pm.isInteractive) {
+                val wl = pm.newWakeLock(
+                    android.os.PowerManager.SCREEN_BRIGHT_WAKE_LOCK or
+                        android.os.PowerManager.ACQUIRE_CAUSES_WAKEUP,
+                    "BaresipWear:incomingCallUI"
+                )
+                wl.acquire(5000)
+            }
+        } catch (e: Exception) {
+            android.util.Log.w("Baresip Wear", "turnScreenOnForCall failed: ${e.message}")
         }
     }
 

wear/src/main/java/com/tutpro/baresip/wear/WearBaresipService.kt

@@ -8,6 +8,7 @@ import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
+import android.app.PendingIntent
 import android.media.AudioManager
 import android.net.ConnectivityManager
 import android.os.Build
@@ -34,6 +35,20 @@ class WearBaresipService : Service() {
             )
             val manager = getSystemService(NotificationManager::class.java)
             manager.createNotificationChannel(channel)
+            // High-importance channel so the incoming-call heads-up (with a
+            // full-screen intent) pops over the watch face / dimmed screen.
+            // Use IMPORTANCE_MAX: on some Wear builds HIGH is still below the
+            // threshold that lets a full-screen intent take over the clock.
+            val callChannel = NotificationChannel(
+                CALL_CHANNEL_ID,
+                "Incoming call",
+                NotificationManager.IMPORTANCE_MAX
+            ).apply {
+                setSound(null, null)
+                enableLights(false)
+                enableVibration(false)
+            }
+            manager.createNotificationChannel(callChannel)
         }
         AudioRouteManager.init(this)
         // Register our SIP identity with the system telecom stack (experiment:
@@ -215,7 +230,7 @@ class WearBaresipService : Service() {
                 CallState.status.value = "Incoming call"
                 // Surface the incoming-call UI even if the app was backgrounded,
                 // and alert the wearer (the watch screen is usually dimmed).
-                alertIncomingCall()
+                alertIncomingCall(peer)
                 // Experiment: also hand the call to the system telecom stack so
                 // the stock Wear incoming UI can be used if the dialer honors
                 // our PhoneAccount. The in-app InCallScreen is shown regardless.
@@ -233,6 +248,7 @@ class WearBaresipService : Service() {
             ev == "call ringing" -> CallState.status.value = "Ringing"
             ev == "call closed" -> {
                 AudioRouteManager.stopCallAudio()
+                dismissIncomingCallNotification()
                 // Surface SIP failure reasons (e.g. "488 Not acceptable here")
                 // as a toast so the user isn't left guessing why the call died.
                 if (arg.isNotBlank()) showToast("Call ended: $arg")
@@ -258,14 +274,15 @@ class WearBaresipService : Service() {
     }
 
     /**
-     * Alert the wearer to an incoming call: bring our activity to the front
-     * (so the Answer/Decline UI shows), wake the (usually dimmed) screen, and
-     * buzz a ring pattern. The actual answer/decline buttons live in the
-     * in-call UI; this only makes sure the user can see and feel the call.
+     * Alert the wearer to an incoming call. On Wear OS a bare startActivity
+     * from a background service does NOT reliably take over the watch face,
+     * so the robust mechanism is a high-priority notification with a
+     * full-screen intent that launches the InCallScreen over the clock.
+     * We also wake the (usually dimmed) screen and buzz a ring pattern.
      */
-    private fun alertIncomingCall() {
+    private fun alertIncomingCall(peer: String) {
+        // Wake the screen if it's asleep.
         try {
-            // Wake the screen if it's asleep.
             val pm = getSystemService(PowerManager::class.java)
             if (pm != null && !pm.isInteractive) {
                 @Suppress("DEPRECATION")
@@ -279,17 +296,52 @@ class WearBaresipService : Service() {
             Log.w("Baresip Wear", "wake failed: ${e.message}")
         }
 
-        // Bring the activity to the foreground so the InCallScreen shows.
+        // Best-effort: also try to bring the activity forward (helps when the
+        // app is already the foreground task and the full-screen intent is
+        // suppressed by the system).
         try {
             val intent = Intent(this, MainActivity::class.java).apply {
-                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP)
+                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_SINGLE_TOP)
                 putExtra("incoming_call", true)
             }
             startActivity(intent)
+            Log.d("Baresip Wear", "alertIncomingCall: startActivity(incoming_call) dispatched")
         } catch (e: Exception) {
             Log.w("Baresip Wear", "bringToFront failed: ${e.message}")
         }
 
+        // High-priority heads-up with a full-screen intent -> the InCallScreen
+        // (Answer/Decline) is shown over the watch face. This is the reliable
+        // alert path on Wear OS.
+        try {
+            val fsIntent = Intent(this, MainActivity::class.java).apply {
+                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP)
+                putExtra("incoming_call", true)
+            }
+            val fsPending = PendingIntent.getActivity(
+                this,
+                2001,
+                fsIntent,
+                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+            )
+            val label = peer.replaceAfter("@", "").removeSuffix("@").ifEmpty { peer }
+            val notification = NotificationCompat.Builder(this, CALL_CHANNEL_ID)
+                .setContentTitle("Incoming call")
+                .setContentText(label)
+                .setSmallIcon(android.R.drawable.sym_call_incoming)
+                .setPriority(NotificationCompat.PRIORITY_MAX)
+                .setCategory(NotificationCompat.CATEGORY_CALL)
+                .setFullScreenIntent(fsPending, true)
+                .setAutoCancel(true)
+                .setOngoing(true)
+                .setTimeoutAfter(60_000L)
+                .build()
+            val nm = getSystemService(NotificationManager::class.java)
+            nm.notify(CALL_NOTIFICATION_ID, notification)
+        } catch (e: Exception) {
+            Log.w("Baresip Wear", "incoming notification failed: ${e.message}")
+        }
+
         // Ring vibration pattern (vibrate, pause, vibrate, pause, ...).
         try {
             val vibrator = getSystemService(Vibrator::class.java)
@@ -309,9 +361,22 @@ class WearBaresipService : Service() {
         }
     }
 
+    /** Remove the incoming-call heads-up once the call is answered/declined. */
+    private fun dismissIncomingCallNotification() {
+        try {
+            val nm = getSystemService(NotificationManager::class.java)
+            nm.cancel(CALL_NOTIFICATION_ID)
+        } catch (e: Exception) {
+            Log.w("Baresip Wear", "cancel call notification failed: ${e.message}")
+        }
+    }
+
     companion object {
         const val CHANNEL_ID = "baresip-wear"
         const val NOTIFICATION_ID = 1
+        // Dedicated high-importance channel for incoming-call heads-up alerts.
+        const val CALL_CHANNEL_ID = "baresip-wear-call"
+        const val CALL_NOTIFICATION_ID = 2
 
         // Application context, captured in onCreate, for toasts from non-UI code.
         lateinit var appContext: Context