跟单击事件类似，长按事件也有4种写法，这里采用当前类作为实现类这种写法，其他写法可以参见《单击事件的4种写法》。

实现步骤:
1.通过id找到组件。
2.给需要的组件设置长按事件。
3.本类实现LongClickedListener接口。
4.重写onLongClicked方法。

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①MainAbilitySlice.java文件

package com.example.yeman.slice;import com.example.yeman.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Button;
import ohos.agp.components.Component;
import ohos.agp.components.Text;public class MainAbilitySlice extends AbilitySlice implements Component.LongClickedListener{Text txt;@Overridepublic void onStart(Intent intent) {super.onStart(intent);super.setUIContent(ResourceTable.Layout_ability_main);//找到按钮。// 说明：findComponentById返回的是父类对象所有组件，因此需要（Button）强转。Button but = (Button) findComponentById(ResourceTable.Id_but);//找到文本框组件txt = (Text) findComponentById(ResourceTable.Id_txt);//给按钮绑定一个双击事件but.setLongClickedListener(this);}@Overridepublic void onActive() {super.onActive();}@Overridepublic void onForeground(Intent intent) {super.onForeground(intent);}@Overridepublic void onLongClicked(Component component) {txt.setText("你长按了按钮！");}
}

②ability_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayoutxmlns:ohos="http://schemas.huawei.com/res/ohos"ohos:height="match_parent"ohos:width="match_parent"ohos:alignment="center"ohos:orientation="vertical"><Textohos:id="$+id:txt"ohos:height="match_content"ohos:width="match_content"ohos:text="这是文本框组件"ohos:text_size="100"/><Buttonohos:id="$+id:but"ohos:height="match_content"ohos:width="match_content"ohos:background_element="blue"ohos:text="请长按我"ohos:text_size="120"/></DirectionalLayout>