In this article, we will learn about android SeekBar using Kotlin. We will go through various example that demonstrates how to use different attributes of SeekBar. For example, …..

In this article, we will get answer to questions like –

• What is SeekBar?
• Why should we consider SeekBar while designing ui for any app?
• What are possibilities using SeekBar while designing ui? etc.

Let’s have a quick demo of things we want to cover in this tutorial –

Output

Tutorialwing Android SeekBar Output

Getting Started

We can define android SeekBar widget as below –

Android seekBar is an extension of progressBar that have draggable thumb. User can drag the thumb back and forth to set current progress value.

Now, how do we use SeekBar in android application ?

Creating New Project

At first, we will create an application.
So, follow steps below to create any android project in Kotlin –

Newbie in Android ?

Some very important concepts (Recommended to learn before you move ahead)

• Install Android Studio
• Create New Project in Android Studio
• Android Project Structure
• Run / Debug / Test Android App

Before we move ahead, we need to setup for viewBinding to access Android SeekBar Using Kotlin file without using findViewById() method.

Setup ViewBinding

Add viewBinding true in app/build.gradle file.

 
 android { 
 	// OTHER CODE... 
 	buildFeatures { 
 		viewBinding true 
 	} 
 } 
 

Now, set content in activity using view binding.
Open MainActivity.kt file and write below code in it.

 
 class MainActivity : AppCompatActivity() { 
 	
 	private lateinit var binding: ActivityMainBinding 
 	
 	override fun onCreate(savedInstanceState: Bundle?) { 
 		super.onCreate(savedInstanceState) 
 		binding = ActivityMainBinding.inflate(layoutInflater) 
 		val view = binding.root 
 		setContentView(view) 
 	} 
 } 
 

Now, we can access view in Kotlin file without using findViewById() method.

Using SeekBar in Kotlin

Follow steps below to use SeekBar in newly created project –

• Open res/values/strings.xml file. Then, add below code into it.

  <resources>
      <string name="app_name">SeekBar</string>
  </resources>
  

• Open res/layout/activity_main.xml file. Then, add below code in it –

  <?xml version="1.0" encoding="utf-8"?>
  <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:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".MainActivity">
  
      <SeekBar
          android:id="@+id/seekBar"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_margin="10dp"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintLeft_toLeftOf="parent"
          app:layout_constraintRight_toRightOf="parent"
          app:layout_constraintTop_toTopOf="parent" />
  
  </androidx.constraintlayout.widget.ConstraintLayout>
  

  In activity_main.xml file, we have defined android seekBar widget. Now, we will access this seekbar using kotlin file to perform some operations on it.

• We can also access it in Kotlin File, MainActivity.kt, as below –

  package com.tutorialwing.seekbar
  
  import androidx.appcompat.app.AppCompatActivity
  import android.os.Bundle
  import android.widget.SeekBar
  import android.widget.Toast
  import com.tutorialwing.seekbar.databinding.ActivityMainBinding
  
  class MainActivity : AppCompatActivity() {
  
  	private lateinit var binding: ActivityMainBinding
  
  	override fun onCreate(savedInstanceState: Bundle?) {
  		super.onCreate(savedInstanceState)
  		binding = ActivityMainBinding.inflate(layoutInflater)
  		val view = binding.root
  		setContentView(view)
  
  		binding.seekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
  			override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
  				// Write code to perform some action when progress is changed.
  			}
  
  			override fun onStartTrackingTouch(seekBar: SeekBar) {
  				// Write code to perform some action when touch is started.
  			}
  
  			override fun onStopTrackingTouch(seekBar: SeekBar) {
  				// Write code to perform some action when touch is stopped.
  				Toast.makeText(
  					this@MainActivity,
  					"Progress is " + seekBar.progress + "%",
  					Toast.LENGTH_SHORT
  				).show()
  			}
  		})
  	}
  }
  

  In MainActivity.kt file, we have accessed seekBar widget. Then, we have set a listener, SeekBarChangeListener, to show a toast message whenever there is change in progress of the seekBar i.e. whenever you drag thumb of the seekBar to Back and forth.

Now, run the application. We will get output as below –

Tutorialwing Android SeekBar Output

Different Attributes of SeekBar in XML

Now, we will see how to use different attributes of Android SeekBar using Kotlin to customise it –

Set Id of SeekBar

Many a time, we need id of View to access it in kotlin file or create ui relative to that view in xml file. So, we can set id of SeekBar using android:id attribute like below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        />

Here, we have set id of SeekBar as seekBar_ID using android:id=”” attribute. So, if we need to reference this SeekBar, we need to use this id – seekBar_ID.
Learn to Set ID of SeekBar Dynamically

Set Width of SeekBar

We use android:layout_width=”” attribute to set width of SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        />

Width can be either “MATCH_PARENT” or “WRAP_CONTENT” or any fixed value (like 20dp, 30dp etc.).
Learn to Set Width of SeekBar Dynamically

Set Height of SeekBar

We use android:layout_height=”” attribute to set height of SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

Height can be either “MATCH_PARENT” or “WRAP_CONTENT” or any fixed value.
Learn to Set Height of SeekBar Dynamically

Set Padding of SeekBar

We use android:padding=”” attribute to set padding of SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        />

Here, we have set padding of 10dp in SeekBar using android:padding=”” attribute.
Learn to Set Padding of SeekBar Dynamically

Set Margin of SeekBar

We use android:layout_margin=”” attribute to set margin of SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        />

Here, we have set margin of 10dp in SeekBar using android:layout_margin=”” attribute.
Learn to Set Margin of SeekBar Dynamically

Set Background of SeekBar

We use android:background=”” attribute to set background of SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#ff0000"
        />

Here, we have set background of color #ff0000 in SeekBar using android:background=”” attribute.
Learn to Set Background of SeekBar Dynamically

Set Visibility of SeekBar

We use android:visibility=”” attribute to set visibility of SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        />

Here, we have set visibility of SeekBar using android:visiblity=”” attribute. Visibility can be of three types – gone, visible and invisible
Learn to Set Visibility of SeekBar Dynamically

Set Text of SeekBar

We use android:text=”” attribute to set text of SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        />

Here, we have set text (“Hello Tutorialwing”) in SeekBar using android:text=”” attribute.
Similarly, we can set any text using this attribute.
Learn to Set Text of SeekBar Dynamically

Set Color of Text in SeekBar

We use android:textColor=”” attribute to set color of text in SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:textColor="#ffffff"     
        />

Here, we have set color (#ffffff i.e. white) of text (“Hello Tutorialwing”) in SeekBar using android:textColor=”” attribute. Similarly, we can set any color using this attribute.
Learn to Set Color of SeekBar Dynamically

Set Gravity of SeekBar

We use android:gravity=”” attribute to set gravity of text in SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:gravity="center_horizontal"
        />

Here, we have set gravity of text in SeekBar using android:gravity=”” attribute. Attribute value can be – “center_horizontal”, “center”, “center_vertical” etc.
Learn to Set Gravity of SeekBar Dynamically

Set Text in Uppercase, Lowercase

If we need to show text of SeekBar in uppercase or lowercase etc.

Set text in uppercase

We can use android:textAllCaps=”true” attribute to set text in uppercase. We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:textAllCaps="true"
        />

Attribute android:textAllCaps=”true” sets text in uppercase. So, HELLO TUTORIALWING is set in SeekBar.

By default, false is set in this attribute. So, Whatever value is written in android:text=”” attribute, it will be set as it is. For example,

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:textAllCaps="false"
        />

Above code will set Hello Tutorialwing to SeekBar.

How do we set text in lowercase?

Answer –

• In xml file – write all the text in lowercase.
• In kotlin file – take text as string. Then, convert it in lowercase. Then, set it to SeekBar.

Learn to Set Text in Uppercase or Lowercase Dynamically

Set Size of Text in SeekBar

We use android:textSize=”” attribute to set size of text in SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:textSize="20sp"
        />

Here, we have set size of text in SeekBar using android:textSize=”” attribute.
Learn to Set Size of Text of SeekBar Dynamically

Set Style (Bold/italic) of Text in SeekBar

We use android:textStyle=”” attribute to set style (bold, italic etc.) of text in SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:textStyle="bold"
        />

Here, we have set style of text in SeekBar using android:textStyle=”” attribute. This attribute can take bold, italic or normal.
Learn to Set Style of Text of SeekBar Dynamically

Set Letter Spacing of Text in SeekBar

We use android:letterSpacing=”” attribute to set spacing between letters of text in SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:letterSpacing="1"
        />

Here, we have set spacing between letters of text in SeekBar using android:letterSpacing=”” attribute.
Learn to Set Letter Spacing of Text of SeekBar Dynamically

Set Typeface of Text in SeekBar

We use android:typeface=”” attribute to set typeface in SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:typeface="sans"
        />

Here, we have set typeface of text in SeekBar using android:typeface=”” attribute. This attribute can take values – “sans”, “normal”, “monospace” or “normal”.
Learn to Set Typeface of SeekBar Dynamically

Set fontFamily of Text in SeekBar

We use android:fontFamily=”” attribute to set fontFamily of text in SeekBar.
We can do it as below –

    <SeekBar
        android:id="@+id/seekBar_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Tutorialwing"
        android:fontFamily="sans-serif"
        />

Here, we have set fontFamily (Here, sans-serif) of text in SeekBar using android:fontFamily=”sans-serif” attribute.

Till now, we have see how to use android SeekBar using Kotlin. We have also gone through different attributes of SeekBar to perform certain task. Let’s have a look at list of such attributes and it’s related task.

Different Attributes of Android SeekBar Widget

Below are the various attributes that are used to customise android SeekBar Widget. However, you can check the complete list of attributes of SeekBar in it’s official documentation site. Here, we are going to list some of the important attributes of this widget –

Some of the popular attributes of seekBar are –

Some of the popular attributes of android seekBar inherited from AbsSeekBar are

Some of the popular attributes of android seekBar inherited from ProgressBar are

Some of the attributes of android seekBar inherited from View are –

We have seen different attributes of SeekBar and how to use it. If you wish to visit post to learn more about it

Thus, we have seen what is SeekBar, how can we use android SeekBar using Kotlin ? etc. We also went through different attributes of android SeekBar.