本文介绍在鸿蒙利用中 TabList 和 TabList.Tab 组件的根本用法。
具体步骤，可点击查看视频
筹备 TabList 页面布局
在 layout 目录下创立 TabList 布局，将其命名为 ability_tablist.xml。
<?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><?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。而动画的理论内容则是由 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: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 页面须要由代码生成，具体参见上面的页面类：
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);
}
}
});
// 最开始选抉择 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 行别离生成了 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。须要响应的解决次要有 Tab 页抉择，Tab 页勾销抉择和 Tab 从新抉择。代码中依据以后选中的 Tab 页面生成或抉择不同的组件。
参考文档
TabList 和 Tab 组件
https://developer.harmonyos.c…
TabList 类
https://developer.harmonyos.c…
Tab List.Tab 类
https://developer.harmonyos.c…
动画开发领导
https://developer.harmonyos.c…
原文链接：https://developer.huawei.com/…
原作者：面向对象思考