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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
正文完
