android 单选 radio的使用

以选中性别为例子：

效果：

布局文件:

<RadioGroup
    android:id="@+id/rg_sex"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="45dip"
    android:orientation="vertical" >

    <RadioButton
        android:id="@+id/rb_man"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:button="@drawable/radio_holo_light"
        android:text="男"
        android:textSize="@dimen/textsize_15"
        android:textColor="@color/black" />

    <RadioButton
        android:id="@+id/rb_woman"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:button="@drawable/radio_holo_light"
        android:text="女"
        android:textSize="@dimen/textsize_15"
        android:textColor="@color/black" />

RadioGroup>

在activity中的使用：

mRadioGroupSex = (RadioGroup) findViewById(R.id.rg_sex);
mRadioButtonMan = (RadioButton) findViewById(R.id.rb_man);
mRadioButtonWoman = (RadioButton) findViewById(R.id.rb_woman);
sex = "男";
((RadioButton)mRadioGroupSex.getChildAt(0)).setChecked(true);//默认选中
mRadioGroupSex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){

    @Override
    public void onCheckedChanged(RadioGroup rg, int checkedId) {
        if(checkedId == mRadioButtonMan.getId()){
            sex = "男";
        }else if(checkedId == mRadioButtonWoman.getId()){
            sex = "女";
        }else{
            sex = "男";
        }
    }
});

选中效果.xml:

radio_holo_light:

xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item 
        android:state_checked="true" 
        android:drawable="@drawable/btn_radio_on_holo_light" />
    
    <item 
        android:state_checked="false" 
        android:drawable="@drawable/btn_radio_off_holo_light" />

selector>

btn_radio_on_holo_light

btn_radio_off_holo_light