How to use RadioButton click event 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="#fff3e1"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Which is your most favorite?"         />     <RadioGroup         android:id="@+id/rg"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:orientation="vertical"         android:layout_below="@id/tv"         >         <RadioButton             android:id="@+id/rb_coldfusion"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="ColdFusion"             android:onClick="onRadioButtonClicked"             />         <RadioButton             android:id="@+id/rb_flex"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Flex"             android:onClick="onRadioButtonClicked"             />     </RadioGroup> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.graphics.Color; import android.os.Bundle; import android.app.Activity; import android.widget.RadioButton; import android.widget.RadioGroup; import android.view.View;  public class MainActivity extends Activity{      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);    }      public void onRadioButtonClicked(View v){         RadioGroup rg = (RadioGroup) findViewById(R.id.rg);         RadioButton rb_coldfusion = (RadioButton) findViewById(R.id.rb_coldfusion);         RadioButton rb_flex = (RadioButton) findViewById(R.id.rb_flex);          // Is the current Radio Button checked?         boolean checked = ((RadioButton) v).isChecked();          switch(v.getId()){             case R.id.rb_coldfusion:                 if(checked)                     rb_coldfusion.setTextColor(Color.RED);                     rb_flex.setTextColor(Color.GRAY);                     break;              case R.id.rb_flex:                 if(checked)                     rb_flex.setTextColor(Color.RED);                     rb_coldfusion.setTextColor(Color.GRAY);                     break;         }     } }
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