In Android development, how does one package multiple programs into an APK file, but multiple programs are displayed after the installation is complete?

After reading the Google map of Android, there are three after installing an APK.ProgramPortal icons, which correspond to three different functions! Easy to set

Both the activities respond to the main intent, for example:

<? XML version = "1.0" encoding = "UTF-8 "? >
<Manifest xmlns: Android =" Http :// Schemas.android.com/apk/res/android ";
Package = "com. foobar"
Android: versioncode = "1"
Android: versionname = "1.0" type = "codeph" text = "/codeph">
<Application Android: icon = "@ drawable/icon" Android: Label = "foobar">
<Activity Android: Name = ". foobar1" Android: Label = "foobar1" Android: taskaffinity = ". foobar1" >

<Intent-filter>
<Action Android: Name = "android. Intent. Action. Main"/>
<Category
Android: Name = "android. Intent. Category. launcher"/>
</Intent-filter>
</Activity>
<Activity Android: Name = ". foobar2" Android: Label = "foobar2" Android: taskaffinity = ". foobar2" >

<Intent-filter>
<Action Android: Name = "android. Intent. Action. Main"/>
<Category
Android: Name = "android. Intent. Category. launcher"/>
</Intent-filter>
</Activity>
</Application>
<Uses-SDK Android: minsdkversion = "3"/>
</Manifest>

Pay attention to the settings of taskaffinity in the simhei section.