Prevent screen rotation while incoming call if screen is locked

README.md

@@ -92,6 +92,8 @@ LinphoneSdkBuildDir=/home/<username>/linphone-sdk/build/
 
 If you encounter the `couldn't find "libc++_shared.so"` crash when the app starts, simply clean the project in Android Studio (under Build menu) and build again.
 
+If during the build you have `DataBinderMapperImpl.java error: cannot find symbol`, try building again.
+
 When submitting an issue, please attach the matching library logs. To enable them, go to Settings -> Advanced and toggle "Debug Mode".
 
 Then restart the app, reproduce the issue and upload the logs using the "Upload logs" button on the About page.

app/src/main/java/org/linphone/activities/GenericActivity.kt

@@ -48,8 +48,10 @@ abstract class GenericActivity : AppCompatActivity() {
         ensureCoreExists(applicationContext)
         hideSystemUI()
 
-        if (corePreferences.forcePortrait) {
-            requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+        requestedOrientation = if (corePreferences.forcePortrait) {
+            ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+        } else {
+            ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
         }
 
         val nightMode = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK

app/src/main/java/org/linphone/activities/call/IncomingCallActivity.kt

@@ -23,6 +23,7 @@ import android.Manifest
 import android.annotation.TargetApi
 import android.app.KeyguardManager
 import android.content.Context
+import android.content.pm.ActivityInfo
 import android.content.pm.PackageManager
 import android.os.Bundle
 import androidx.databinding.DataBindingUtil
@@ -84,6 +85,10 @@ class IncomingCallActivity : GenericActivity() {
         val keyguardManager = getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager
         val keyguardLocked = keyguardManager.isKeyguardLocked
         viewModel.screenLocked.value = keyguardLocked
+        if (keyguardLocked) {
+            // Forbid screen rotation to prevent keyguard to show up above incoming call view
+            requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LOCKED
+        }
 
         binding.buttons.setViewModel(viewModel)