Hello Reader! In this post, we are going to learn how to create android checkbox programmatically. We will also learn how to add Checkbox widget in linearLayout dynamically.

Output

Tutorialwing Android Dynamic Checkbox Ouptut

Getting Started

At first, we will create an android project. Then, we will create checkbox widget dynamically and use it in this project.

1. Creating New Project

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

Now, we will modify xml and java file to use checkbox programmatically.

2. Modify Values Folder

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

<resources>
	<string name="app_name">DynamicCheckbox</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 with id rootContainer will act as container for the checkbox widget created dynamically.

4. Create Android Checkbox Programmatically / Dynamically

Open app/src/main/java/com.tutorialwing.dynamiccheckbox/MainActivity.java file and 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.CompoundButton;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);


		LinearLayout linearLayout = findViewById(R.id.rootContainer);

		// Create Checkbox Dynamically
		CheckBox checkBox = new CheckBox(this);
		checkBox.setText(R.string.check_it);
		checkBox.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
		checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
			@Override
			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
				String msg = "You have " + (isChecked ? "checked" : "unchecked") + " this Check it Checkbox.";
				Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
			}
		});

		// Add Checkbox to LinearLayout
		if (linearLayout != null) {
			linearLayout.addView(checkBox);
		}
	}
}

Here, we have created checkbox programmatically in MainActivity.java file. Then, Added it to linearLayout with id rootContainer. We have also set listener to show toast message when checkbox checked/unchecked state is changed.

Since AndroidManifest.xml file is very important in any android project. We are also going to mention it here.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file would look like below –

<?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>

Now, run the application. You will get output as shown above.

That’s end of our tutorial on creating checkbox programmatically in android.