Radiobutton in Android

package com.mkyong.android;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
 
public class MyAndroidAppActivity extends Activity {
 
  private RadioGroup radioSexGroup;
  private RadioButton radioSexButton;
  private Button btnDisplay;
 
  @Override
  public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
 
	addListenerOnButton();
 
  }
 
  public void addListenerOnButton() {
 
	radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
	btnDisplay = (Button) findViewById(R.id.btnDisplay);
 
	btnDisplay.setOnClickListener(new OnClickListener() {
 
		@Override
		public void onClick(View v) {
 
		        // get selected radio button from radioGroup
			int selectedId = radioSexGroup.getCheckedRadioButtonId();
 
			// find the radiobutton by returned id
		        radioSexButton = (RadioButton) findViewById(selectedId);
 
			Toast.makeText(MyAndroidAppActivity.this,
				radioSexButton.getText(), Toast.LENGTH_SHORT).show();
 
		}
 
	});
 
  }
}
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