Fix #3810: Fix splash screen freeze on Android 11

config/proguard/androidx-proguard-rules.pro

@@ -39,3 +39,17 @@
 # A strange unknown issue that arises within a Room class (it seems an actual dependency is missing
 # within Room).
 -dontwarn androidx.room.paging.LimitOffsetDataSource
+
+# Ensure that lifecycle-related components (such as LiveData) work correctly. For context, see:
+# https://github.com/oppia/oppia-android/issues/3810#issuecomment-931925578.
+-keepclassmembers enum androidx.lifecycle.Lifecycle$Event {
+    <fields>;
+}
+-keep !interface * implements androidx.lifecycle.LifecycleObserver {}
+-keep class * implements androidx.lifecycle.GeneratedAdapter {
+    <init>(...);
+}
+-keepclassmembers class ** {
+    @androidx.lifecycle.OnLifecycleEvent *;
+}
+-keepclassmembers class androidx.lifecycle.ReportFragment$LifecycleCallbacks { *; }

domain/src/main/java/org/oppia/android/domain/locale/LocaleController.kt

@@ -103,8 +103,6 @@ class LocaleController @Inject constructor(
     }.build()
   }
 
-  // TODO(#3800): Utilize this method to build in resilience for low-memory process deaths resulting
-  //  in crashes upon the app be foregrounded.
   /**
    * Returns a new [DisplayLocale] corresponding to the specified [OppiaLocaleContext]. This is
    * meant to be used in cases when a context needs to be saved (e.g. in a bundle) and later