I just made a Flutter app following the instructions of this page, and I googled how to change the name of the application, and found this answer. But I can't change the name of the application from the manifest file. Initially android:name is io.flutter.app.FlutterApplication. I changed that to Startup Namer, and it gave the error
error: attribute 'android:name' in <application> tag must be a valid Java class name.
How to reslove this error and change the name?