The document discusses various attributes of TextView, Button, and ImageView UI components in Android mobile application development. TextView can display text with attributes like id, gravity, hint, text, textColor, textSize, textStyle, and more. Button is used to perform actions on click with attributes like id, text, textColor, textSize, textStyle, and background. ImageView displays image resources with attributes like id, src, background, and scaleType. Images are added to the drawable folder and referenced in code by resource id without file extension.