Animation scale in Android

[daniele-athome]

Flutter won't use provided value by the operating system for setting time dilation (see flutter/flutter#10101). Although there is a way to get these values apparently, starting API level 17:

• Settings.Global.ANIMATOR_DURATION_SCALE
• Settings.Global.TRANSITION_ANIMATION_SCALE
• Settings.Global.WINDOW_ANIMATION_SCALE

I'm not sure which one to apply directly to timeDilation... and the transition scale should probably be applied only to transition animations (manually?)

Also open another bug to Flutter for this.

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https://titanwolf.org/Network/Articles/Article?AID=304f1ee4-07a2-4138-85fb-a843c9ddb4bf

[daniele-athome]

Apparently the settings values are not automatically notified by the system so we either accept what comes in at startup or periodically (when?) poll them.

Also, timeDilation doesn't really work on release builds for some reason... but I couldn't use it anyway because it's not meant for this.

• TRANSITION_ANIMATION_SCALE should be used in (full screen) PageRoutes
• WINDOW_ANIMATION_SCALE should be used for dialogs and other "windows" (e.g. toasts)
• ANIMATOR_DURATION_SCALE should be used for widget animations (e.g. loading spinner)

It would be nice that Flutter did this though...