本文介绍在鸿蒙应用中TabList和TabList.Tab组件的基本用法。
准备TabList页面布局
在layout目录下创建TabList布局，将其命名为ability_tablist.xml。
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">
<TabList
ohos:id="$ id:tab_list"
ohos:background_element="#FFFF7F"
ohos:top_margin="10vp"
ohos:tab_margin="24vp"
ohos:tab_length="140vp"
ohos:text_size="20fp"
ohos:height="36vp"
ohos:width="match_parent"
ohos:layout_alignment="center"
ohos:orientation="horizontal"
ohos:text_alignment="center"
ohos:normal_text_color="#999999"
ohos:selected_text_color="#000000"
ohos:selected_tab_indicator_color="#000000"
ohos:selected_tab_indicator_height="2vp"/>
<DirectionalLayout
ohos:id="$ id:tab_container"
ohos:height="match_parent"
ohos:width="match_parent">
</DirectionalLayout>
</DirectionalLayout>布局代码中第7行~第22行的用于生成TabList组件，定义了TabList的基本属性；第23行~第27行用于生成Tab页面的容器，目前还没有具体内容，稍后有具体代码生成。
准备Image页面
Image页面主要包含一个Image文件和简单的文字表示：
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="$media:DevEco"
/>
<Component
ohos:height="20vp"
ohos:width="match_parent"
/>
<Text
ohos:id="$ id:text_helloworld"
ohos:height="match_content"
ohos:width="match_content"
ohos:layout_alignment="horizontal_center"
ohos:text="Image Tab"
ohos:text_color="#007F00"
ohos:text_size="100"
/>
</DirectionalLayout>
<Component
ohos:height="0vp"
ohos:weight="5"
ohos:width="match_parent"
/>
</DirectionalLayout>准备Video页面
Video页面包含一个动画，稍微复杂一些。首先是页面本身：：
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">
<Component
ohos:id="$ id:video_area"
ohos:height="300vp"
ohos:width="300vp"
/>
<Component
ohos:height="20vp"
ohos:width="match_parent"
/>
<Text
ohos:id="$ id:text_helloworld"
ohos:height="match_content"
ohos:width="match_content"
ohos:layout_alignment="horizontal_center"
ohos:text="Video Tab"
ohos:text_color="#0000FF"
ohos:text_size="100"
/>
</DirectionalLayout>
<Component
ohos:height="0vp"
ohos:weight="5"
ohos:width="match_parent"
/>
</DirectionalLayout>这个文件和Image页面区别不大，只是在用Component组件代替了Image组件。而动画的实际内容则是由graphic目录中的animation_element.xml文件决定：
代码语言：javascript复制<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:oneshot="false">
<item ohos:element="$media:video01" ohos:duration="100"/>
<item ohos:element="$media:video02" ohos:duration="100"/>
<item ohos:element="$media:video03" ohos:duration="100"/>
<item ohos:element="$media:video04" ohos:duration="100"/>
<item ohos:element="$media:video05" ohos:duration="100"/>
<item ohos:element="$media:video06" ohos:duration="100"/>
<item ohos:element="$media:video07" ohos:duration="100"/>
<item ohos:element="$media:video08" ohos:duration="100"/>
<item ohos:element="$media:video09" ohos:duration="100"/>
<item ohos:element="$media:video10" ohos:duration="100"/>
<item ohos:element="$media:video11" ohos:duration="100"/>
</animation-list>生成TabList画面
TabList的每个Tab页面需要由代码生成，具体参见下面的页面类：
代码语言：javascript复制package com.example.helloharmony.slice;
import com.example.helloharmony.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.*;
import ohos.agp.components.element.FrameAnimationElement;
import java.io.Console;
public class TablistAbilitySlice extends AbilitySlice {
private Component imageContent;
private Component videoContent;
private FrameAnimationElement frameAnimationElement;
@Override
public void onStart(Intent intent) {
super.onStart(intent);
super.setUIContent(ResourceTable.Layout_ability_tablist);
TabList tabList = (TabList) findComponentById(ResourceTable.Id_tab_list);
tabList.setTabLength(200); // 设置Tab的宽度
tabList.setTabMargin(26); // 设置两个Tab之间的间距
TabList.Tab tab1 = tabList.new Tab(getContext());
tab1.setText("Image");
tabList.addTab(tab1);
TabList.Tab tab2 = tabList.new Tab(getContext());
tab2.setText("Video");
tabList.addTab(tab2);
AbilitySlice slice = this;
tabList.addTabSelectedListener(new TabList.TabSelectedListener() {
@Override
public void onSelected(TabList.Tab tab) {
ComponentContainer container = (ComponentContainer) findComponentById(ResourceTable.Id_tab_container);
if(tab.getText().equals("Image")) {
imageContent = LayoutScatter.getInstance(slice).parse(ResourceTable.Layout_iamge_tab, null, false);
container.addComponent(imageContent);
}
else
{
videoContent = LayoutScatter.getInstance(slice).parse(ResourceTable.Layout_video_tab, null, false);
frameAnimationElement = new FrameAnimationElement(slice.getContext(), ResourceTable.Graphic_animation_element);
Component videoArea = videoContent.findComponentById(ResourceTable.Id_video_area);
videoArea.setBackground(frameAnimationElement);
frameAnimationElement.start();
container.addComponent(videoContent);
}
}
@Override
public void onUnselected(TabList.Tab tab) {
if(tab.getText().equals("Video")) {
frameAnimationElement.start();
}
ComponentContainer container = (ComponentContainer) findComponentById(ResourceTable.Id_tab_container);
container.removeAllComponents();
}
@Override
public void onReselected(TabList.Tab tab) {
ComponentContainer container = (ComponentContainer) findComponentById(ResourceTable.Id_tab_container);
if(tab.getText().equals("Image")) {
container.addComponent(imageContent);
}
else
{
frameAnimationElement.start();
container.addComponent(videoContent);
}
}
});
//最开始选选择tab1
tabList.selectTab(tab1);
}
@Override
public void onActive() {
super.onActive();
}
@Override
public void onForeground(Intent intent) {
super.onForeground(intent);
}
}
代码第22行~第27行分别生成了Image和Video两个Tab页。
第29行~第69行是为TabList的各种事件提供响应。需要响应的处理主要有Tab页选择，Tab页取消选择和Tab重新选择。代码中根据当前选中的Tab页面生成或选择不同的组件。
画面显示如下：
代码语言：javascript复制TabList和Tab组件
https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ui-java-component-tablist-tab-0000001062229749
TabList类
https://developer.harmonyos.com/cn/docs/documentation/doc-references/tablist-0000001054238721
Tab List.Tab类
https://developer.harmonyos.com/cn/docs/documentation/doc-references/tablist_tab-0000001054678691
动画开发指导
https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ui-java-animation-0000000000580278
