public class MainActivity extends AppCompatActivity {

@Override
 protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}public void onRadioButton클릭ed (View view) {
boolean checked = ((RadioButton) view).isChecked();
switch (view.getId()) {
case R.id.rb1:
if (checked)
Toast.makeText(getApplicationContext(), ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();
break;
case R.id.rb2:
if (checked)
Toast.makeText(getApplicationContext(), ((RadioButton) view).getText(), Toast.LENGTH_SHORT).show();
break;
}
} 

단일선택해야되는데 왜 중복선택이 될까용?ㅜㅜ