RadioGroup

  RadioGroup是用于让用户进行单选的选择按钮，用法很简单。要给RadioGroup注册一个OnCheckedChangeListener监听事件来监听RadioButton的Checked状态。在这里不知道大家有没有这样一个疑问？为什么这里的OnCheckedChangeListener与checkbox中的OnCheckedChangeListener不是同一个呢？有木有？这是因为我们这里RadioGroup在父类是LinearLayout，而checkbox的父类是CompoundButton，我们当然不能用CompoundButton.OnCheckedChangeListener这个监听器啦

package com.kevin.radioGroup;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;

public class Main extends Activity {
	private RadioGroup group;
	private RadioButton radioHandsome,radioBeauty;
	private TextView tv_result;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        group = (RadioGroup) findViewById(R.id.radioGroup1);
        tv_result = (TextView) findViewById(R.id.tv_result);
        radioHandsome = (RadioButton) findViewById(R.id.radio0);
        radioBeauty = (RadioButton) findViewById(R.id.radio1);
        // 给RadioGroup绑定OnCheckedChangeListener
        group.setOnCheckedChangeListener(new RadioGroupOnCheckedChangeListener());
    }
    class RadioGroupOnCheckedChangeListener implements OnCheckedChangeListener{
		// 处理选择RadioButton的CheckedChanged事件
    	@Override
		public void onCheckedChanged(RadioGroup group, int checkedId) {
			if(checkedId == radioHandsome.getId()){
				tv_result.setText(radioHandsome.getText());
			}else if(checkedId == radioBeauty.getId()){
				tv_result.setText(radioBeauty.getText());
			}
		}
    	
    }
}