The app bar that appears at the top of most Android apps can consist of a number of different elements including a toolbar, tab layout and even an image view. When embedded in a CoordinatorLayout parent, a number of different options are available to control the way in which the app bar behaves in response to scrolling events in the main content of the activity. For greater control over this behavior, the CollapsingToolbarLayout manager provides a range of additional levels of control over the way the app bar content expands and contracts in relation to scrolling activity.
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