Create An Android Toggle Button Programmatically in Kotlin




Target

Hello Readers! In this post, we will learn how to create android toggle button programmatically in kotlin.

Output

Tutorialwing android dynamic toggle button output android toggle button programmatically in android

Tutorialwing android dynamic toggle button output

Getting Started

At first, we will create a new android project. Then, we will create toggle button programmatically in kotlin file.

1. Creating New Project

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

Step Description
1. Open Android Studio.
2. Go to File => New => New Project. Write application name as DynamicToggleButton. Then, check Include Kotlin Support and click next button.
3. Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button
4. Then, select Empty Activity => click next => click finish.
5. At this point, You will get a newly created android project successfully.

You may visit our post to to create android project to know the steps in detail. Steps are similar in kotlin too.

Now, we will modify the xml and kotlin file to create and show toggle button programmatically.

2. Modify Values Folder

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

<resources>
	<string name="app_name">DynamicToggleButton</string>
	<string name="toggleButton">ToggleButton</string>
</resources>

Other folders have not been changed. So, we are not going to mention it 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>

Here, LinearLayout with id rootContainer will act as container for the toggle button created programmatically.

4. Create Android Toggle Button Programmatically in Kotlin

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

package com.tutorialwing.dynamictogglebutton

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

class MainActivity : AppCompatActivity() {

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

        val linearLayout = findViewById<LinearLayout>(R.id.rootContainer)

        // Create ToggleButton Dynamically
        val toggleButton = ToggleButton(this)
        toggleButton.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        toggleButton.setOnCheckedChangeListener { buttonView, isChecked ->
            val msg = "Toggle Button is " + if (isChecked) "ON" else "OFF"
            Toast.makeText(this@MainActivity, msg, Toast.LENGTH_SHORT).show()
        }

        // Add ToggleButton to LinearLayout
        linearLayout?.addView(toggleButton)
    }
}

In Mainactivity.kt file, we have created a toggle button dynamically and added it to linearLayout. We have also added code to show toast message when state of the toggle button is changed.

Since AndroidManifest.xml file is very important in any android application, we are also going to mention it here.

AndroidManifest.xml file

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

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamictogglebutton"
		  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 you run the program, you will output as shown above.

That’s end of tutorial on creating Android Toggle Button programmatically in Kotlin programming language.