Obtains information about all components that can respond to an intent.

1. After each app is installed, its mainfest file will be registered to the system, similar to the Windows registry.

 

2. When we want to know which types of components can respond to an intent, we can use

Packagemanager's query... or resolve *** method, you can get the component information resolveinfo.

 

3. Obtain all portal activities.

Intent mainintent = new intent (intent. action_main, null );

Mainintent. addcategory (intent. category_default );

Packagemanager PM = getpackagemanager ();
List <resolveinfo> List = PM. queryintentactivities (mainintent, 0 );

Obtains information about all components that can respond to an intent.