EditText/RadioButton/CheckBox使用

package com.test.android;

import android.app.Activity;
import android.os.Bundle;
import android.view.*;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.Toast;

public class HelloAndroid extends Activity {
    private EditText _editText;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        _editText = (EditText)findViewById(R.id.EditText01);
        _editText.setHint("请输入一个值");
        _editText.setOnKeyListener(new EditText.OnKeyListener(){
            public boolean onKey(View arg0, int arg1, KeyEvent arg2){
                dispToast("输入值:"+_editText.getText().toString());
                return false;
            }
        });
        
        RadioGroup rgp = (RadioGroup)findViewById(R.id.RadioGroup01);
        rgp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){
            public void onCheckedChanged(RadioGroup group, int checkedId){
                dispToast(Integer.toString(checkedId));
            }
        });
        
        CheckBox cb1 = (CheckBox)findViewById(R.id.CheckBox01);
        cb1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked){
                if (isChecked){
                    dispToast("选择了"+buttonView.getText().toString());
                }
            }
        });
    }
    public void dispToast(String str){
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
    }
}