Allow OS notifications

android/app/build.gradle.kts

@@ -13,6 +13,9 @@ android {
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
+        // required by flutter_local_notifications and other libraries using
+        // Java 8+ APIs at runtime
+        isCoreLibraryDesugaringEnabled = true
     }
 
     kotlinOptions {
@@ -37,6 +40,14 @@ android {
             signingConfig = signingConfigs.getByName("debug")
         }
     }
+
+    // allow desugaring of Java 8+ library APIs
+
+}
+
+// dependencies section for additional compile-only libraries
+dependencies {
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
 }
 
 flutter {