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Android – Timer, update UI

http://qaru.site/questions/342385/how-to-change-a-textview-every-second-in-android

Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask()
        {
            public void run()
            {
                //your code
            }
        }, delay, period);

How to Update the UI in an Android Activity Using Data from a Background Service

https://android-developers.googleblog.com/2007/11/stitch-in-time.html

Updating the UI from a Timer _ Android Developers

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ToolBar AppBarLayout CoordinatorLayout CollapsingToolBarLayout

AppBarLayout on developer.android.com

Layout Lessons! Better Android Layouts: coordinator layout, constraint layout, percent relative layout. (https://withintent.uncorkedstudios.com/layout-lessons-better-android-layouts-b00f52b0643a)

CollapsingToolbarLayout

Hello Toolbar, Goodbye ActionBar

Collapsing Toolbar Layout on antonioleiva.com

Coordinator Layout on habr pdf

CollapsingToolbarLayout with darker imageview (pdf)

Scrolling down triggers refresh instead of revealing the toolbar on stackoverflow.com

Handling Scrolls with CoordinatorLayout

Rambler about CoordinatorLayout

https://medium.com/@zoha131/coordinatorlayout-basic-8040c74cf426