本文介绍在鸿蒙应用中RadioButton和RadioContainer组件的基本用法。
增加RadioButton和RadioContainer组件
如下代码中46行~66行所示，在布局中增加RadioButton和RadioContainer组件。
代码语言：javascript复制<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:height="match_parent"
ohos:width="match_parent"
ohos:orientation="vertical">
<Component
ohos:height="0vp"
ohos:weight="3"
ohos:width="match_parent"
/>
<DirectionalLayout
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:height="match_content"
ohos:width="match_content"
ohos:layout_alignment="center"
ohos:orientation="vertical">
<Image
ohos:id="$ id:image"
ohos:width="match_content"
ohos:height="match_content"
ohos:layout_alignment="center"
ohos:image_src="$media:DevEco"
/>
<TextField
ohos:id="$ id:text_field"
ohos:width="match_parent"
ohos:height="30vp"
ohos:text_size="20fp"
ohos:text_alignment="center"
ohos:hint="Please input text and press [Click me!] button."
ohos:background_element="$graphic:background_text_field"
/>
<Button
ohos:id="$ id:hello_button"
ohos:width="match_content"
ohos:height="match_content"
ohos:text_size="27fp"
ohos:text="Click me!"
ohos:layout_alignment="center"
ohos:background_element="$graphic:background_button"
ohos:margin="15vp"
ohos:right_padding="8vp"
ohos:left_padding="8vp"
/>
<RadioContainer
ohos:id="$ id:radio_container"
ohos:height="match_content"
ohos:width="match_content"
ohos:top_margin="32vp"
ohos:layout_alignment="horizontal_center"
ohos:orientation="horizontal">
<RadioButton
ohos:id="$ id:r24h"
ohos:height="40vp"
ohos:width="match_content"
ohos:text="24H"
ohos:marked="true"
ohos:text_size="20fp"/>
<RadioButton
ohos:id="$ id:r12h"
ohos:height="40vp"
ohos:width="match_content"
ohos:text="12H"
ohos:text_size="20fp"/>
</RadioContainer>
<TimePicker
ohos:id="$ id:time_picker"
ohos:24_hour_mode="false"
ohos:height="match_content"
ohos:width="match_parent"
ohos:layout_alignment="horizontal_center"
ohos:text_am="AM"
ohos:text_pm="PM"
ohos:normal_text_size="20fp"
ohos:selected_text_size="25fp"/>
</DirectionalLayout>
<Component
ohos:height="0vp"
ohos:weight="5"
ohos:width="match_parent"
/>
</DirectionalLayout>代码中组件id被指定为radio_container，会在下面的响应代码中用到。
在代码中使用RadioButton和RadioContainer组件
下面代码中的第18行获取RadioContainer组件后，在第22行根据RadioContainer的状态更新TimePicker的形式，然后在第40行~43行为RadioContainer增加响应处理，其内容是同样是根据选中的RadioButton的索引更新TimePicker的形式。
代码语言：javascript复制import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.*;
import ohos.agp.window.dialog.ToastDialog;
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;
public class ComponentAbilitySlice extends AbilitySlice {
@Override
public void onStart(Intent intent) {
super.onStart(intent);
super.setUIContent(ResourceTable.Layout_ability_component);
//获取textfield输入组件
TextField tf = (TextField) findComponentById(ResourceTable.Id_text_field);
//获取button组件
Button button = (Button) findComponentById(ResourceTable.Id_hello_button);
//获取RedioContainer组件
RadioContainer rcontainer = (RadioContainer)findComponentById(ResourceTable.Id_radio_container);
//获取TimePicker组件
TimePicker picker = (TimePicker) findComponentById(ResourceTable.Id_time_picker);
//根据RadioContainer的状态设定TimePicker的形式。
picker.set24Hour(rcontainer.getMarkedButtonId()==0);
// 为按钮设置点击事件回调
button.setClickedListener(new Component.ClickedListener() {
public void onClick(Component v) {
LocalTime rightNow = LocalTime.now();
LocalTime pickTime = LocalTime.of(picker.getHour(), picker.getMinute(), picker.getSecond());
String msg;
if(pickTime.isBefore(rightNow))
msg = "所选时间比现在时刻早" pickTime.until(rightNow, ChronoUnit.SECONDS) "秒";
else if(pickTime.isAfter(rightNow))
msg = "所选时间比现在时刻晚" rightNow.until(pickTime, ChronoUnit.SECONDS) "秒";
else
msg = "所选时间和现在时刻一样";
new ToastDialog(getContext())
.setText(msg)
.show();
}
});
//为RadioContainer设置事件响应
rcontainer.setMarkChangedListener((radioContainer1, index) -> {
picker.set24Hour(index == 0);
});
//为TimePicker设定事件响应
picker.setTimeChangedListener(
new TimePicker.TimeChangedListener() {
@Override
public void onTimeChanged(TimePicker timePicker, int hour, int minute, int second) {
tf.setText(hour ":" minute ":" second);
}
}
);
}
@Override
public void onActive() {
super.onActive();
}
@Override
public void onForeground(Intent intent) {
super.onForeground(intent);
}
}参考文档
RadioContainer组件：
https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ui-java-component-radiocontainer-0000001063470429
RadioContainer类：
https://developer.harmonyos.com/cn/docs/documentation/doc-references/radiocontainer-0000001054678720
RadioButton组件
https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ui-java-component-radiobutton-0000001060647792
RadioButton类
https://developer.harmonyos.com/cn/docs/documentation/doc-references/radiobutton-0000001054518732
