fix: lock screen flags are not permanent

dialer/android/app/src/main/AndroidManifest.xml

@@ -23,14 +23,12 @@
         <activity
             android:name=".activities.MainActivity"
             android:exported="true"
-            android:launchMode="singleTask"
+            android:launchMode="singleTop"
             android:taskAffinity=""
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
-            android:windowSoftInputMode="adjustResize"
-            android:showWhenLocked="true"
-            android:turnScreenOn="true">
+            android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
                  while the Flutter UI initializes. After that, this theme continues

dialer/android/app/src/main/kotlin/com/icing/dialer/activities/MainActivity.kt

@@ -34,6 +34,7 @@ class MainActivity : FlutterActivity() {
         Log.d(TAG, "onCreate started")
         wasPhoneLocked = intent.getBooleanExtra("wasPhoneLocked", false)
         Log.d(TAG, "Was phone locked at start: $wasPhoneLocked")
+        updateLockScreenFlags(intent)
         handleIncomingCallIntent(intent)
     }
 
@@ -42,9 +43,39 @@ class MainActivity : FlutterActivity() {
         setIntent(intent)
         wasPhoneLocked = intent.getBooleanExtra("wasPhoneLocked", false)
         Log.d(TAG, "onNewIntent, wasPhoneLocked: $wasPhoneLocked")
+        updateLockScreenFlags(intent)
         handleIncomingCallIntent(intent)
     }
 
+    private fun updateLockScreenFlags(intent: Intent?) {
+        val isIncomingCall = intent?.getBooleanExtra("isIncomingCall", false) ?: false
+        if (isIncomingCall && wasPhoneLocked) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+                setShowWhenLocked(true)
+                setTurnScreenOn(true)
+            } else {
+                @Suppress("DEPRECATION")
+                window.addFlags(
+                    android.view.WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED or
+                    android.view.WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
+                )
+            }
+            Log.d(TAG, "Enabled showWhenLocked and turnScreenOn for incoming call")
+        } else {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+                setShowWhenLocked(false)
+                setTurnScreenOn(false)
+            } else {
+                @Suppress("DEPRECATION")
+                window.clearFlags(
+                    android.view.WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED or
+                    android.view.WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
+                )
+            }
+            Log.d(TAG, "Disabled showWhenLocked and turnScreenOn for normal usage")
+        }
+    }
+
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)
         Log.d(TAG, "Configuring Flutter engine")