android app package name change.

android/app/build.gradle

@@ -37,7 +37,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.test_sa"
+        applicationId "com.hmg.atoms"
         // You can update the following values to match your application needs. 
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
         minSdkVersion 21