java.lang.ClassCastException: android.widget.RadioButton cannot be cast to android.view.ViewGroup

1package org.app.box;
2
3import android.app.Activity;
4import android.os.Bundle;
5import android.view.View;
6import android.view.View.OnClickListener;
7import android.widget.Button;
8import android.widget.RadioButton;
9import android.widget.TextView;
10
11public class dollareurocon extends Activity implements OnClickListener {
12 TextView dollars;
13 TextView euros;
14 RadioButton dollartoeuro;
15 RadioButton eurotodollar;
16 Button convert;
17
18 /** Called when the activity is first created. */
19 @Override
20 public void onCreate(Bundle icicle) {
21 super.onCreate(icicle);
22 setContentView(R.layout.dollartoeuroconv);
23
24 dollars = (TextView)this.findViewById(R.id.dollar);
25 euros = (TextView)this.findViewById(R.id.euro);
26
27 dollartoeuro = (RadioButton)this.findViewById(R.id.dollartoeuro);
28 dollartoeuro.setChecked(true);
29 eurotodollar = (RadioButton)this.findViewById(R.id.eurotodollar);
30 eurotodollar.setChecked(true);
31
32 convert = (Button)this.findViewById(R.id.convert);
33 convert.setOnClickListener(this);
34 }
35
36 public void onClick(View v) {
37 if (dollartoeuro.isChecked()) {
38 convertDollarsToEuros();
39 }
40 if (eurotodollar.isChecked()) {
41 convertEurosToDollars();
42 }
43 }