Discrete SeekBar in Kotlin

In Android Discrete SeekBar is just an advancement of progressBar just like the SeekBar, the only difference in SeekBar and discrete SeekBar being that in discrete SeekBar, we can only set the value only to discrete values like 1, 2, 3, and so on.

In this article, we will be discussing how to create a SeekBar in Kotlin.

Important Attributes of Discrete SeekBar

XML Attributes	Description
android:max	Sets the maximum value
android:min	Sets the minimum value
android:progress	Specifies the already set progress value
android:progressDrawable	Sets drawable of the progress mode.
android:thumb	Helps to draw a thumb on seekBar..
android:thumbTint	Set blending mode to apply the thumb tint.
android:thumbTintMode	Set tint to apply on tick mark drawable.
android:tickMarkTint	Set blending mode used to apply the tick mark tint.
android:tickMarkTintMode	Set blending mode used to apply the tick mark tint.
android:elevation	Sets base z-depth of the view

Step by Step Implementation

Step 1: Create a new project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. After doing this you will see some directories on the left hand side after your project/gradle is finished loading. It should look like this:

Step 2: Modify activity_main.xml file

After that, we need to design our layout. For that we need to work with the XML file. Go to app > res > layout and paste the following code.

style=”@style/Widget.AppCompat.SeekBar.Discrete”

This style is used to display the seekBar to make it work for discrete values.

activity_main.xml:

XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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/main"
    android:gravity="center"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <SeekBar
        android:id="@+id/seek"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="@style/Widget.AppCompat.SeekBar.Discrete"
        android:max="10"
        android:min="1"
        android:progress="7"
        android:layout_margin="40dp"/>

</LinearLayout>

Design UI:

Step 3: Create SeekBar in MainActivity.kt file

Open app > src > main > java > {package-name} > MainActivity.kt and do the following changes:

MainActivity.kt:

Kotlin

package org.geeksforgeeks.demo

import android.os.Bundle
import android.widget.SeekBar
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        //accessing the seekbar from our layout
        val seekBar: SeekBar = findViewById(R.id.seek)

        seekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
            override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
                // add functionalities for when progress is changed
            }

            override fun onStartTrackingTouch(seekBar: SeekBar) {
                // add functionalities for when the user starts touching the seekbar
            }

            override fun onStopTrackingTouch(seekBar: SeekBar) {
                //  add functionalities for when the user stops touching the seekbar
                Toast.makeText(this@MainActivity, "Value: " + seekBar.progress, Toast.LENGTH_SHORT).show()
            }
        })
    }
}