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I want to include Toolbar in my app, but the design support library just came out with AppBarLayout, so I just need clarification on what the difference is and when I would use one over the other.
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AppBarLayout is a parent layout of ToolBar and ToolBar is custom ActionBar. if you want scroll action on the ToolBar so you should write ToolBar into the AppBarLayout,before you will write code for scroll the ToolBar, you must know the NestedScrollBar,it is used to scroll the ToolBar.
AppBarLayout is a vertical LinearLayout which implements many of the features of material designs app bar concept, namely scrolling gestures. Children should provide their desired scrolling behavior through AppBarLayout.
The Toolbar is basically the advanced successor of the ActionBar. It is much more flexible and customizable in terms of appearance and functionality. Unlike ActionBar, its position is not hardcoded i.e., not at the top of an activity.
The key differences that distinguish the Toolbar from the ActionBar include: Toolbar is a View included in a layout like any other View. As a regular View , the toolbar is easier to position, animate and control. Multiple distinct Toolbar elements can be defined within a single activity.
If you want just to include the Toolbar without any scrolling effects you can use Toolbar. But if you want to make some scrolling effects like on the images you need to use AppBarLayout.
More here and here.
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The AppBarLayout is used to achieve various scrolling behaviors such as collapse, flex space, and quick return.
http://www.google.com/design/spec/patterns/scrolling-techniques.html
http://android-developers.blogspot.com/2015/05/android-design-support-library.html
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