Category in Android

Provides additional information about the action to be executed, which is generally used when the activity is started implicitly. The common category is as follows:

 

Category_alternative
Sets whether the activity can be considered an optional action of the data that the user is browsing.
 
Category_app_browser
Used with action_main to start Browser Applications
 
Category_app_calculator
Used with action_main to start the calculator Application
 
Category_app_calendar
Used with action_main to start the calendar application
 
Category_app_contacts
Used with action_main to start the Contact application
 
Category_app_email
Used with action_main to start the mail application
 
Category_app_gallery
Used with action_main to start the image library Application
 
Category_app_maps
Used with action_main to start the map application
 
Category_app_market
This activity allows users to browse and download new applications.
 
Category_app_messaging
Used with action_main to start the SMS Application
 
Category_app_music
Used with action_main to start the music application
 
Category_browsable
The activity that can be safely called by the browser must support this category.
 
Category_default
Set whether this activity is optional for the default action.
 
Category_embed
Can run in the parent activity container
 
Category_home
Main activity. When the application starts, it is the first activity to be displayed.
 
Category_launcher
It should be displayed in the upper startup list

Category_monkey
This activity may be executed by monkey or other automated testing tools.
 
Category_openable
Indicates a get_content intent that only requires contentresolver. openinputstream to enable URI
 
Category_preference
This activity is a tab
 
Category_sample_code
Used as a simple code example (usually not used)
 
Category_selected_alternative
Sets whether the activity can be considered an optional action of the user's selected data.
 
Category_tab
To use it as a tab in an existing tabactivity
 
Category_test
For testing (usually not used)
 
Category_unit_test
Joint Test

Reference: http://blog.csdn.net/ygc87/article/details/7480695