RadioGroup 和RadioButton 的基本使用方法

        //根据ID找到RadioGroup实例
        RadioGroup group = (RadioGroup) findViewById(R.id.radioGroup);
        //绑定一个匿名监听器
        group.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            
            @Override
            public void onCheckedChanged(RadioGroup arg0, int arg1) {

                //获取变更后的选中项的ID
                int radioButtonId = arg0.getCheckedRadioButtonId();
                switch(radioButtonId){
                case R.id.radiobtn1:
                //todo  what you want
                break;
                case R.id.radiobtn2:
                //todo  what you want
                break;
                }
            }
        });

xml文件中RadioButton必须放在 RadioGroup中。