Android笔记(五):Android中的Radio
上篇介绍了CheckBox,这节,将接触到的是RadioGroup和RadioButton。
它们的关系是:一个RadioGroup对应多个RadioButton,而一个RadioGroup中的RadioButton只能同时有一个被选中,它的选中值就是该RadioGroup的选中值。
这一节的代码运行效果图如下所示:
具体的代码编写过程如下:
首先在strings.xml中添加本程序所要用到的字符串:
<?xml version="1.0" encoding="utf-8"?><resources> <string name="hello">Hello World, Test!</string> <string name="app_name">AndroidWithRadioGroup</string> <string name="radio_1">帅哥</string> <string name="radio_2">美女</string> <string name="question">请问你的性别是?</string></resources>
<TextView android:id="@+id/showText" android:layout_width="228px" android:layout_height="49px" android:text="@string/question" android:textSize="20sp" /> <!-- 建立一个radioGroup --><RadioGroup android:id="@+id/radioGroup"android:layout_width="137px"android:layout_height="216px"android:orientation="horizontal"> <!-- 建立一个RadioButton --><RadioButtonandroid:id="@+id/radioButton1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/radio_1"/> <!-- 建立第二个RadioButton --><RadioButton android:id="@+id/radioButton2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/radio_2"/></RadioGroup>
super.onCreate(savedInstanceState);setContentView(R.layout.main);textView = (TextView) findViewById(R.id.showText);radioGroup = (RadioGroup) findViewById(R.id.radioGroup);radioButton1 = (RadioButton) findViewById(R.id.radioButton1);radioButton2 = (RadioButton) findViewById(R.id.radioButton2);radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {public void onCheckedChanged(RadioGroup group, int checkedId) {if (checkedId == radioButton1.getId()) {textView.setText(radioButton1.getText());} else if (checkedId == radioButton2.getId()) {textView.setText(radioButton2.getText());}}});