Android Studio RatingBar

The RatingBar is a graphical control element that allows users to select a rating value. It is a subclass of the ProgressBar class and provides a flexible way to display a rating bar with customizable appearance.

Syntax

<RatingBar
    android:id="@+id/ratingBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:numStars="5"
    android:stepSize="0.5"
    android:rating="3.0"/>

Example

<RatingBar
    android:id="@+id/ratingBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:numStars="5"
    android:stepSize="1"
    android:rating="3.0"/>

Output

The above example will show a rating bar with 5 stars and a rating of 3.0 initially.

Explanation

• android:id: The unique identifier for the rating bar.
• android:layout_width: The width of the rating bar.
• android:layout_height: The height of the rating bar.
• android:numStars: The number of stars displayed in the rating bar.
• android:stepSize: The step size of the rating bar (e.g. 0.5 or 1.0).
• android:rating: The initial rating value of the rating bar.

Use

The RatingBar is commonly used in app interfaces where user feedback is required, such as ratings for products or services.

Important Points

• The RatingBar must be bound to a value in code to retrieve and set the rating value.
• The android:isIndicator attribute can be used to prevent the user from adjusting the rating value.

Summary

The RatingBar is a useful graphical control element in Android Studio that allows users to provide a rating value for a product or service. It can be customized in appearance and behavior and is commonly used in app interfaces where feedback is required.