Layouts in Android UI Design:

The extensions of the ViewGroup class is called Layout Manager. They are used to set the position of child Views within the UI we are building.There is a number of layout classes in the Android SDK. They can be used,modified and create your own to make the UI.This makes the app suitable for the diverse set of Android devices. 

 layout classes in Android SDK: 

- FrameLayout 

- LinearLayout

- RelativeLayout

- GridLayout