Hello Readers! In this post, we are going to learn how to create and use android switch programmatically in any android application. We will also learn how to add switch widget in linearLayout programmatically in the application.

Output

Tutorialwing Android Dynamic Switch Output

Getting Started

At first, we will create android application. Then, we will use android switch widget in it.

1. Creating New Project

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

Now, we will modify xml and java file to use Android Dynamic Switch programmatically.

2. Modify values folder

No values folders 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 switch widget in the application.

4. Create Android Switch Programmatically / Dynamically

Open app/src/main/java/com.tutorialwing.dynamicswitch/MainActivity.java file and add below code into it.

package com.tutorialwing.dynamicswitch;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.Switch;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

		// Create Switch programmatically.
		final Switch sw = new Switch(this);
		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		layoutParams.setMargins(30, 30, 30, 30);
		sw.setLayoutParams(layoutParams);
		sw.setText("OFF");

		LinearLayout linearLayout = findViewById(R.id.rootContainer);
		// Add Switch to LinearLayout
		if (linearLayout != null) {
			linearLayout.addView(sw);
		}

		sw.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
			@Override
			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
				String msg = isChecked ? "ON" : "OFF";
				Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
				sw.setText(msg);
			}
		});
	}
}

In MainActivity.java file, we have created a switch widget. Then, we have added this switch widget in linearLayout, having id rootContainer. After that, we have set a listener that will show a toast message displaying the current status of the switch widget whenever it is clicked.

Since AndroidManifest.xml file is very important in any android project. We are also going to see the content inside this file.

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.dynamicswitch"
		  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 application, we will get output as shown above.

That’s the end of tutorial on Creating Android Switch Programmatically