Android How to modify app is not displayed in multi-task list

In actual development, we want some activity or application not to appear in the multi-task list, that is, long press the home button or multi-task buttons do not display the most recently run programs, We can add the following attributes to the Activity tab in the Androidmanifest.xml file of the appropriate application:
Android:excludefromrecents= "true"

For example, you do not need to display xxxactivity in a multi-task list:

    <activity        android:name="xxxActivity"        android:label="@string/app_name"        android:screenOrientation="portrait"

+ + android:excludefromrecents= "true"
Android:theme= "@style/appactivitytheme" >

Android How to modify app is not displayed in multi-task list