Final answer:
To apply a theme to an Android application or activity, you can edit the styles.xml file.
Step-by-step explanation:
You can open the styles.xml file and edit it to apply a theme to the entire application or to a specific activity.
App theming is a way to style pages and widgets using global controls. This allows users to change the visual layout of an app with a single click.
A theme is a set of styles or attributes that can affect the look and feel of a user's device. These attributes include:
Color
Type
Shape
Darkness of surfaces
Level of shadow
Opacity of ink elements
Apply a consistent tone to an app
Customize design aspects to meet the needs of a business or brand
Tweak and update visual properties like font colors