RatingBar in Kotlin Last Updated : 12 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Android RatingBar is a user interface widget which is used to get the rating from the customers or users. It is an extension of SeekBar and ProgressBar that shows star ratings and it allow users to give the rating by clicking on the stars. In RatingBar, we can set the step size using android:stepSize and it will always return a rating value as floating point number such as 1.0, 2.0, 2.5 etc. By using, android:numStars attribute we can specify the number of stars in RatingBar. RatingBar is used to get ratings form users or customers about the product, movie or hotel experience etc. Different Attributes of RatingBar WidgetXML AttributesDescriptionandroid:idUsed to uniquely identify the control.android:ratingUsed to set the default rating value for ratingbar.android:numStarsUsed to set number of stars to display.android:backgroundUsed to set the background color for Ratingbar.android:paddingUsed to set the padding for left, right, top or bottom of Ratingbar.android:stepSizeUsed to set the step size on RatingBar like 0.5 or 1.Step by Step ImplementationStep 1: Create a new projectTo create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio.Note: Select Kotlin as the programming language.Step 2: Modify the activity_main.xml fileIn this file, we add Rating Bar and button in the LinearLayout. Also set attributes for both of the widgets like id, stepSize, background etc.activity_main.xml: XML <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white" tools:context=".MainActivity"> <RatingBar android:id="@+id/ratingBar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="32dp" android:layout_marginBottom="32dp" app:layout_constraintBottom_toTopOf="@+id/button" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/textView2" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Rate Me!!!" android:textColor="@android:color/background_dark" android:textSize="32sp" app:layout_constraintBottom_toTopOf="@+id/ratingBar" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.5" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_chainStyle="packed" /> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="32dp" android:text="You Rated : _._" android:textColorHint="@color/colorAccent" android:textSize="24sp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/button" /> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Submit" app:layout_constraintBottom_toTopOf="@+id/textView" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/ratingBar" /> </androidx.constraintlayout.widget.ConstraintLayout> Design UI: Step 3: Access the RatingBar in MainActivity.kt file First, we will declare the variable rBar to access the Rating using the id like private lateinit var ratingBar: RatingBarratingBar = findViewById(R.id.ratingBar) then, declare another variable button and access the button using its id. private lateinit var button: Buttonbutton = findViewById(R.id.button) In the end, to display toast msg while submitting the ratings we code like this button.setOnClickListener { textView.text = "You Rated : " + ratingBar.rating}MainActivity.kt: Kotlin package org.geeksforgeeks.demo import android.os.Bundle import android.widget.Button import android.widget.RatingBar import android.widget.TextView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { // Declare UI elements private lateinit var ratingBar: RatingBar private lateinit var button: Button private lateinit var textView: TextView override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) // Initialize UI elements by finding their respective IDs ratingBar = findViewById(R.id.ratingBar) textView = findViewById(R.id.textView) button = findViewById(R.id.button) // Set click listener for the button button.setOnClickListener { // Display the rating value inside the TextView when the button is clicked textView.text = buildString { append("You Rated : ") append(ratingBar.rating) } } } } Output: Comment More infoAdvertise with us Next Article Dynamic RatingBar in Kotlin P Praveenruhil Follow Improve Article Tags : Kotlin Kotlin Android Android-Bars Similar Reads Kotlin Android Tutorial Kotlin is a cross-platform programming language that may be used as an alternative to Java for Android App Development. 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