android RadioGroup實現單選以及預設選中

標籤：android   radiogroup   radiobutton   單選   預設值   

本文將通過radiogroup和radiobutton實現組內資訊的單選, 

其中radiogroup就是將radiobutton進行分組,同一管理和控制

同時實現預設選中情況,擷取預設值.

具體執行個體如下：

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">請選擇你的性別：</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(){@Overridepublic void onCheckedChanged(RadioGroup rg, int checkedId) {// TODO Auto-generated method stubif(checkedId == manRb.getId()){seletedTv.setText(defaultStr + manRb.getText().toString());}else if(checkedId == womanRb.getId()){seletedTv.setText(defaultStr + womanRb.getText().toString());}else{seletedTv.setText(defaultStr);}}        });    }