2021-08-12 11:44:59
0
1. 长按事件- 长按事件使用的次数不是很多,但在有些特殊的情况下还是要用到的。
- 比如:复制一段文字的时候就是长按操作
- 长按事件和单、双击事件也非常类似
- 接口名:LongClickedListener
2. 实现案例:长按按钮修改文本内容
- 新建项目:ListenerApplication3
ability_main
- <?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="$+id:text1"
- ohos:height="match_content"
- ohos:width="match_content"
- ohos:text="text"
- ohos:text_size="100">
- </Text>
- <Button
- ohos:id="$+id:but1"
- ohos:height="match_content"
- ohos:width="match_content"
- ohos:text="点我"
- ohos:text_size="100"
- ohos:background_element="red">
- </Button>
- </DirectionalLayout>
- MainAbilitySlice
- package com.xdr630.listenerapplication3.slice;
- import com.xdr630.listenerapplication3.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 {
- //提为成员变量,否则onLongClicked访问不到文本组件,并初始化默认值
- Text text1 = null;
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main);
- //1.找到文本框组件和按钮组件
- text1 = (Text) findComponentById(ResourceTable.Id_text1);
- Button but1 = (Button) findComponentById(ResourceTable.Id_but1);
- //2.绑定长按事件,点谁就给谁绑定事件
- //当对按钮进行长按操作时,就会执行this本类中onLongClicked方法
- but1.setLongClickedListener(this);
- }
- @Override
- public void onActive() {
- super.onActive();
- }
- @Override
- public void onForeground(Intent intent) {
- super.onForeground(intent);
- }
- @Override
- public void onLongClicked(Component component) {
- //修改文本框的内容
- text1.setText("长按");
- }
- }
复制代码
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