What's the correct syntax to define an activity in manifest file

Question

What is the correct way of adding an activity to AndroidManifest.xml?

Actually I have seen in many places an activity defined as

Answer 1

dot means your package name. It's more short type of declaration.

If you define a subclass, as you almost always would for the component classes (Activity, Service, BroadcastReceiver, and ContentProvider), the subclass is declared through a name attribute. The name must include the full package designation. For example, an Service subclass might be declared as follows:

     
         
             . . .
         
         . . .
      

However, as a shorthand, if the first character of the string is a period, the string is appended to the application's package name (as specified by the element's package attribute). The following assignment is the same as the one above:

     
         
             . . .
         
         . . .
      
 

When starting a component, Android creates an instance of the named subclass. If a subclass isn't specified, it creates an instance of the base class.

http://developer.android.com/guide/topics/manifest/manifest-intro.html Declaring class names