title: How to call the Contacts application in android phone
body: <p>I need to show the contact list and do not want to make a contact list by a program. I want to call the Contacts application that is available  in all android phone.
  I already know the package name is com.android.contacts.But I do not know the class names of this package. </p>
  
  <p>Anybody can help me, please.</p>