android Radio Button

import android.widget.*; 

import android.view.*;

import android.view.View.OnClickListener;

public class MainActivity extends Activity {

RadioButton r1,r2;

RadioGroup rg;

Button b1;

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

                        r1=(RadioButton) findViewById(R.id.radio0);

                        r2=(RadioButton) findViewById(R.id.radio1);

                         rg=(RadioGroup) findViewById(R.id.radioGroup1);

                         b1=(Button) findViewById(R.id.button1);

                         b1.setOnClickListener(L1);

            }

public OnClickListener L1=new OnClickListener()

    {

    public void onClick(View v)

    {

            if(v==b1)

            {

                   if(r1.isChecked()==true)

                        Toast.makeText(getBaseContext(),r1.getText(),Toast.LENGTH_LONG).show();

                   if(r2.isChecked()==true)

                        Toast.makeText(getBaseContext(),r2.getText(),Toast.LENGTH_LONG).show();

            }

        }

    };

}