android RadioGroup实现单选以及默认选中

代码下载链接：http://download.csdn.net/detail/a123demi/7511835

本文将通过radiogroup和radiobutton实现组内信息的单选,

其中radiogroup就是将radiobutton进行分组,同一管理和控制

同时实现默认选中情况,获取默认值.效果图



具体实例如下：

1.activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin" >

<TextView
android:id="@+id/diplay_seleted_item_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/please_selected"/>

<RadioGroup
android:id="@+id/sex_rg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00FF00"
android:orientation="vertical" >

<RadioButton
android:id="@+id/man_rb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/man" />

<RadioButton
android:id="@+id/woman_rb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/woman" />
</RadioGroup>

</LinearLayout>

2.strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="app_name">RadioGroupDemo</string>
<string name="please_selected">请选择你的性别：</string>
<string name="action_settings">Settings</string>
<string name="man">男</string>
<string name="woman">女</string>

</resources>

3.MainActivity.java

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

defaultStr = this.getResources().getString(R.string.please_selected);
seletedTv = (TextView) this.findViewById(R.id.diplay_seleted_item_tv);
sexRg = (RadioGroup) this.findViewById(R.id.sex_rg);
manRb = (RadioButton) this.findViewById(R.id.man_rb);
womanRb = (RadioButton) this.findViewById(R.id.woman_rb);

manRb.setChecked(true);
seletedTv.setText(defaultStr + manRb.getText().toString());

sexRg.setOnCheckedChangeListener(new OnCheckedChangeListener(){

@Override
public void onCheckedChanged(RadioGroup rg, int checkedId) {
// TODO Auto-generated method stub
if(checkedId == manRb.getId()){
seletedTv.setText(defaultStr + manRb.getText().toString());
}else if(checkedId == womanRb.getId()){
seletedTv.setText(defaultStr + womanRb.getText().toString());
}else{
seletedTv.setText(defaultStr);
}
}
});
}