lawnchair/wmshell/src/com/android/wm/shell/docs/extending.md

Extending the Shell for Products/OEMs

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General Do's & Dont's

Do:

•  

Don't

• Don't override classes provided by WMShellBaseModule, it makes it difficult to make simple changes to the Shell library base modules which are shared by all products
  • If possible add mechanisms to modify the base class behavior