Sometimes we need to save some data when the activity is re-created.
Sometimes we need no support the rotation of the screen. It must be either portrait or landscape. There is a solution for each activity
Explaining how to access any resource by variable, not directly. Example with "drawables"
Replacing all spaces in URL to %20
With this function you can calculate the age of a person
self.document.location.hash self.document.location.hash.substring(1)