本文介绍在鸿蒙应用中TabList和TabList.Tab组件的基本用法。

具体步骤，可点击 查看视频

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。

<?xml version="1.0" encoding="utf-8"?><DirectionalLayout    xmlns:ohos="

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。

<?xml version="1.0" encoding="utf-8"?><animation-list xmlns:ohos=">

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：

<?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：

<?xml version="1.0" encoding="utf-8"?><DirectionalLayout    xmlns:ohos="

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：

<?xml version="1.0" encoding="utf-8"?><animation-list xmlns:ohos="http://schemas.huawei.com/res/ohos"                ohos:>



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：
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。



参考文档



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 



原文链接：

https://developer.huawei.com/consumer/cn/forum/topic/0201551132050440304?fid=0101303901040230869
原作者：面向对象思考