Material Design app bar filtering best practices

I’m looking into material-design filtering patterns and came across this example. I have two concerns about it:

  1. Not quite sure about the visual compatibility of the filter icon and the hamburger menu icon in the app bar.

  2. If a filter is selected, should the app bar title (i.e. ‘Everything’) adapt to display the currently chosen filter? If so, wouldn’t that conflict with the functionality of the hamburger menu?

For example, say that there’s a section in the navigation drawer called ‘Timeline’. And within Timeline you have filters that can be applied (Filter 1, Filter 2, etc.). Navigating to Timeline and then choosing Filter 1 will change the app bar title to Filter 1. While in the Navigation Drawer, if opened, ‘Timeline’ will still be highlighted.

What do you guys think?

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