HarmonyOS（鸿蒙）——长按事件

冷不防 2022-09-04 03:54 386阅读 0赞

**本文已收录于专栏**

[❤️《鸿蒙开发》❤️][Link 1]

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**往期文章汇总-方便有需要的朋友直达：**

[HarmonyOS（鸿蒙）DevEco Studio开发环境搭建][HarmonyOS_DevEco Studio]

[HarmonyOS（鸿蒙）开发一文入门][HarmonyOS]

[两个案例五分钟轻松入门Harmony（鸿蒙）开发][Harmony]

[HarmonyOS与Android的全面对比][HarmonyOS_Android]

[HarmonyOS（鸿蒙）全网最全资源汇总，吐血整理，赶紧收藏！][HarmonyOS 1]

[HarmonyOS（鸿蒙）—— Ability与页面][HarmonyOS_ Ability]

[HarmonyOS（鸿蒙）——config.json详解][HarmonyOS_config.json]

[HarmonyOS（鸿蒙）——启动流程][HarmonyOS 2]

[HarmonyOS（鸿蒙）——全面入门，始于而不止于HelloWorld][HarmonyOS_HelloWorld]

[HarmonyOS（鸿蒙）——单击事件][HarmonyOS 3]

[HarmonyOS（鸿蒙）——单击事件的四种写法详述][HarmonyOS 4]

[HarmonyOS（鸿蒙）——双击事件][HarmonyOS 5]

**目录**

一、实现步骤

二、代码实现

2.1 定义页面元素

2.2 长按事件实现

三、测试

--------------------

## 一、实现步骤 ##

实现HarmonyOS（鸿蒙）的长按事件主要分为四个步骤：

1.  定义组件，给组件分配唯一ID，之后通过ID定位组件
2.  给定义的组件绑定双击事件
3.  实现Component.LongClickedListener接口并重写onLongClicked方法
4.  实现onLongClicked方法中的具体逻辑，以此完成长按事件的相关业务操作

## 二、代码实现 ##

### 2.1 定义页面元素 ###

<?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:alignment="center"
        ohos:orientation="vertical">
    
          
        
        <Text
            ohos:id="$+id:text_helloworld"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text="$string:mainability_HelloWorld"
            ohos:text_size="40vp"
            />
    
    </DirectionalLayout>

### 2.2 长按事件实现 ###

package com.liziba.demo.slice;
    
    import com.liziba.demo.ResourceTable;
    import ohos.aafwk.ability.AbilitySlice;
    import ohos.aafwk.content.Intent;
    import ohos.agp.components.Component;
    import ohos.agp.components.Text;
    
    public class MainAbilitySlice extends AbilitySlice implements Component.LongClickedListener {
        @Override
        public void onStart(Intent intent) {
            super.onStart(intent);
            super.setUIContent(ResourceTable.Layout_ability_main);
    
            // 1、通过id查询到组件
            Text text = (Text) this.findComponentById(ResourceTable.Id_text_helloworld);
    
            // 2、给组件设置长按事件
            text.setLongClickedListener(this);
        }
    
        @Override
        public void onActive() {
            super.onActive();
        }
    
        @Override
        public void onForeground(Intent intent) {
            super.onForeground(intent);
        }
    
        /**
         * 长按事件触发回调的方法，此方法来自于实现Component.LongClickedListener重写的方法
         *
         * @param component
         */
        @Override
        public void onLongClicked(Component component) {
            Text text = (Text) component;
            text.setText("你好，李子捌！");
        }
    }

## 三、测试 ##

长按之前

![image.png][]

长按之后

![image.png][image.png 1]

[Link 1]: https://blog.csdn.net/qq_41125219/category_11227374.html
[HarmonyOS_DevEco Studio]: https://blog.csdn.net/qq_41125219/article/details/118980608?spm=1001.2014.3001.5501
[HarmonyOS]: https://blog.csdn.net/qq_41125219/article/details/119012509?spm=1001.2014.3001.5501
[Harmony]: https://blog.csdn.net/qq_41125219/article/details/119090348?spm=1001.2014.3001.5501
[HarmonyOS_Android]: https://blog.csdn.net/qq_41125219/article/details/119066740?spm=1001.2014.3001.5501
[HarmonyOS 1]: https://blog.csdn.net/qq_41125219/article/details/119121522?spm=1001.2014.3001.5501
[HarmonyOS_ Ability]: https://blog.csdn.net/qq_41125219/article/details/119192989?spm=1001.2014.3001.5501
[HarmonyOS_config.json]: https://blog.csdn.net/qq_41125219/article/details/119224472
[HarmonyOS 2]: https://blog.csdn.net/qq_41125219/article/details/119284052
[HarmonyOS_HelloWorld]: https://blog.csdn.net/qq_41125219/article/details/119284492?spm=1001.2014.3001.5501
[HarmonyOS 3]: https://blog.csdn.net/qq_41125219/article/details/119337623
[HarmonyOS 4]: https://blog.csdn.net/qq_41125219/article/details/119523068?spm=1001.2014.3001.5501
[HarmonyOS 5]: https://blog.csdn.net/qq_41125219/article/details/119548422?spm=1001.2014.3001.5501
[image.png]: /images/20220829/8e6cf08fd00048f8ae1d711859aca474.png
[image.png 1]: /images/20220829/71dabe6f285547b2be31341874c90d07.png