Hello Readers! In this post, we are going to learn about how to use android seekBar programmatically in kotlin file in any android application. We will also learn how to add seekBar into linearLayout programmatically in any application.

Output

Tutorialwing Android Dynamic SeekBar Output

Getting Started

At first, we will create android project. Then, we will create and use seekBar programmatically in kotlin file.

1. Creating New Project in Kotlin

Follow the steps below to create new project. Please ignore the steps if you have already created a new project.

Now, we will modify xml and other files to use seekBar programmatically in kotlin file.

2. Modify Values Folder

No values folder have been modified. So, we are not going to mention them here.

3. Modify Layout Folder

Open res/layout/activity_main.xml file. Then, add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	android:id="@+id/rootContainer"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:gravity="center"
	android:orientation="vertical">

</LinearLayout>

In activity_main.xml file, we have defined a linearLayout, with id rootContainer, that will act as container for the seekBar created programmatically in the application.

4. Create Android SeekBar Programmatically / Dynamically in Kotlin

Open app/src/main/java/com.tutorialwing.dynamicseekbar/MainActivity.kt file. Then, add below code into it.

package com.tutorialwing.dynamicseekbar

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.SeekBar
import android.widget.Toast

class MainActivity : AppCompatActivity() {

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

        val seekBar = SeekBar(this)
        val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        layoutParams.setMargins(30, 30, 30, 30)
        seekBar.layoutParams = layoutParams

        val linearLayout = findViewById<LinearLayout>(R.id.rootContainer)
        // Add SeekBar to LinearLayout
        linearLayout?.addView(seekBar)

        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 created a seekBar widget programmatically. Then, we have added this seekbar widget into linearLayout, having id rootContainer. At last, we have set a listener to show a toast message whenever there is a change in progress of the seekbar i.e. position of the thumb of the seekBar.

Since AndroidManifest file is very important in any application, we are also going to see the content inside this file.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file is –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamicseekbar"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<application
		android:allowBackup="true"
		android:icon="@mipmap/ic_launcher"
		android:label="@string/app_name"
		android:roundIcon="@mipmap/ic_launcher_round"
		android:supportsRtl="true"
		android:theme="@style/AppTheme">
		<activity android:name=".MainActivity">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>

				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>

</manifest>

When we run the program, we will get output as shown above.

That’s end of our tutorial on Creating Android SeekBar Programmatically in Kotlin.