라디오 버튼 만들기 안드로이드

package com.example.ryan.myapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.RadioButton;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void onRadioButtonClicked(View view){
        boolean checked = ((RadioButton)view).isChecked();
        switch (view.getId()){
            case R.id.radio_red:
                if(checked)
                    Toast.makeText(getApplicationContext(),((RadioButton)view).getText(),Toast.LENGTH_SHORT).show();
                break;

            case R.id.radio_blue:
                if(checked)
                    Toast.makeText(getApplicationContext(),((RadioButton)view).getText(),Toast.LENGTH_SHORT).show();
                break;
        }
    }


}

다중 체크 불가능