How to add listener for Switch button in Android

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#eff4f5"     >     <Switch         android:id="@+id/switch_button"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.graphics.Color; import android.os.Bundle; import android.app.Activity; import android.widget.CompoundButton; import android.widget.RelativeLayout; import android.widget.Switch; import android.widget.Toast;   public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         simpulan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         Switch switch_button = (Switch) findViewById(R.id.switch_button);          // Set a checked change listener for switch button         switch_button.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {             @Override             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                 if(isChecked){                     // If the switch button is on                     rl.setBackgroundColor(Color.parseColor("#FF80DFB0"));                      // Show the switch button checked status as toast message                     Toast.makeText(getApplicationContext(),                             "Switch is on", Toast.LENGTH_LONG).show();                 }                 else {                     // If the switch button is off                     rl.setBackgroundColor(Color.parseColor("#ed252f"));                      // Show the switch button checked status as toast message                     Toast.makeText(getApplicationContext(),                             "Switch is off", Toast.LENGTH_LONG).show();                 }             }         });     } }


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