Taking ownership of what is normally the system's decorations for your application provides you with a huge variety of additional flexibility and power. By using the CoordinatorLayout to host the scaffolding and content of your screens, you further extend your flexibility by allowing widgets to dynamically interact with each other, even when being animated. This provides you with a way to produce pixel-perfect screens with minimal additional work.
Using layouts that cannot only dynamically change their shape, but also change their content using gestures such as swipe-to-dismiss to further enhance the direct manipulation aspects of a touchscreen user interface have been covered. At the same time, it's important to always consider the interactions of your user and when to interrupt them, especially around destructive actions. While there are still times where you might want to use a confirmation dialog, it's generally better to give users a method to undo their actions. It's often a...