Layout

Layout concept

A layout defines the structure of the user interface. Layouts are built via views and view groups.

Views, also sometimes called “widgets,” represent interactable components such as:

• TextView - component to render text
• EditText - input field component where user can type text
• Button - clickable text component with background

ViewGroups, sometimes also called “layouts,” represent invisible containers that define the position of its children on the screen. While Android SDK contains a number of view groups, which still can be used, Google recently released a new view group called ConstraintLayout.