Background
I am making an alternative to the app-manager application by default ( here ), and currently I have 4 sorting options and one filtering option:
- sort by installation time, update time, package name and application name
- enable system applications or not
This can be shown here:

As you can see, both filtering and sorting are shown here through the submenu of the action bar, and I think I should do it differently.
Problem
I want to add additional functions for filtering, and I think that the current implementation will not be enough.
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