Create An Android Checkbox Programmatically in Kotlin

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Hello Readers! In this tutorial, we will learn how to create android checkbox programmatically in kotlin. We will also learn how to add checkbox widget in linearLayout programmatically.

Output

Tutorialwing Android Kotlin Dynamic Checkbox Output Android Checkbox programmatically using kotlin

Tutorialwing Android Kotlin Dynamic Checkbox Output

Getting Started

At first, we will create android project. Then, we will create and use checkbox 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.

Step Description
1. Open Android Studio.
2. Go to File => New => New Project. Write application name as DynamicCheckbox. 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.

Now, we will modify xml and kotlin file to use checkbox dynamically.

2. Modify Values Folder

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

<resources>
	<string name="app_name">DynamicCheckboxUsingKotlin</string>
	<string name="check_it">Check it</string>
</resources>

Other values folder 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 having id rootContainer will act as container for the checkbox widget created dynamically.

4. Create Android Toggle Button Programmatically / Dynamically in Kotlin

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

package com.tutorialwing.dynamiccheckbox

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

class MainActivity : AppCompatActivity() {

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

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

        // Create Checkbox Dynamically
        val checkBox = CheckBox(this)
        checkBox.setText(R.string.check_it)
        checkBox.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        checkBox.setOnCheckedChangeListener { buttonView, isChecked ->
            val msg = "You have " + (if (isChecked) "checked" else "unchecked") + " this Check it Checkbox."
            Toast.makeText(this@MainActivity, msg, Toast.LENGTH_SHORT).show()
        }

        // Add Checkbox to LinearLayout
        linearLayout?.addView(checkBox)
    }
}

In this file, we have created checkbox programmatically in kotlin file (MainActivity.kt). We have also added a listener to show a toast message when checked/unchecked states of checkbox is changed.

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

AndroidManifest.xml file

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

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamiccheckbox"
		  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 Checkbox Programmatically in Kotlin.

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Greetings!
We have recently published 100+ articles on android tutorials with kotlin and java. If you need, you may visit Android Tutorial for beginners page. You can also check Kotlin Tutorial for beginners