UI enhancements

[milindgoel15]

• can you make the appbar stay at the same place when scrolling? Just like it happens in the settings page.
• tint the appbar color when scrolling down otherwise stays on background color
• make the bottom navigation bar transparent on the settings page and bottom sheets. Currently, it's black.
• medium/large type appbar in settings page

[Jesse205]

And on lower versions of Android the status bar icons are white in color and not visible

[Jesse205]

I don't know why, I can't compile it into an arm64 application, so I can't test if the code I modified works properly.I can only make a few key points.

System bars

1. Google supports the bright status bar on Android 6 and needs to define android:windowLightStatusBar in XML.
2. Google supports bright navigation bars on Android 8 and XML definitions on Android 8.1.The attribute value is android:windowLightNavigationBar
3. Devices that do not suppor light navigation or status bars should use a black semi transparent background to ensure that they can be seen clearly.
4. The code should use WindowsInsetsCompat to controll light mode, which will be compatible with earlier Android versions.

Scroll

Set an ID for each scrollable view, and Android will automatically handle the scrolling position after reloading the activity.

App bar

1. The root layout must be CoordinaterLayout
2. Suggest setting liftOnScrollTargetViewId to ensure normal operation on some pages