Android - How to hide the application from Launcher and Application list

  Hi,
   Now a days there is more requirement of spy kind of applications, That means application should not be
   visible.

  From two places we can see the applications,
     1. Launcher
     2. settings --> applications.

  Lets see how to hide the application from laucher :

  Launcher application finds all installed application having launching category. So, we need to remove launcher category from manifest file and restart the launcher i mean restart the device.

              <category android:name="android.intent.category.LAUNCHER" />
  replace this with any other category for example

             <category android:name="android.intent.category.DEFAULT" /> 

  because an activity without category cant be opened/called.


  How can we hide from Application list :

   I am reading it :P