【HarmonyOS】应用振动效果实现

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一、问题背景：
应用在强提醒场景下，一般会有马达振动的效果，提示用户注意力的关注。

比如消息提醒，扫码提示，删除键确认提示等。

针对高定制化或者固定的振动方式，我们需要有不同的方案实现，马达振动效果。

二、解决方案：
鸿蒙针对振动效果的实现，有多种方案，目前分为振动和音振协同两种方式。

单纯的只是振动，又分为三种方式：

1. 系统定制的振动方式，例如闹钟
2. 非系统定制，自定义振动配置json文件的方式
3. 线性马达振动，只需要设置时间和强度（最简单的调用方式）

音振协同一般用于，音效播放和振动同时的场景，例如扫码。

1.首先需要配置振动权限，该权限是系统权限，只需要配置后，默认就会被授权。
ohos.permission.VIBRATE

2.之后根据需要实现不同的马达振动效果，方案调用详情参见下方代码示例的注释。

三、DEMO示例：

import vibrator from '@ohos.vibrator';
import { BusinessError } from '@ohos.base';
import { resourceManager } from '@kit.LocalizationKit';/*** 振动管理类* 需要权限： ohos.permission.VIBRATE*/
export class HapticMgr {private TAG: string = 'HapticMgr';private static mHapticMgr: HapticMgr | undefined = undefined;public static Ins(): HapticMgr{if(!HapticMgr.mHapticMgr){HapticMgr.mHapticMgr = new HapticMgr();}return HapticMgr.mHapticMgr;}/*** 按照指定持续时间触发马达振动*/public timeVibration(){try {// 触发马达振动vibrator.startVibration({type: 'time',duration: 1000,}, {id: 0,usage: 'alarm'}, (error: BusinessError) => {if (error) {console.error(`Failed to start vibration. Code: ${error.code}, message: ${error.message}`);return;}console.info('Succeed in starting vibration');});} catch (err) {let e: BusinessError = err as BusinessError;console.error(`An unexpected error occurred. Code: ${e.code}, message: ${e.message}`);}}/*** 按照预置振动效果触发马达振动，可先查询振动效果是否被支持，再调用振动接口*/public typeVibration(){try {// 查询是否支持'haptic.clock.timer'vibrator.isSupportEffect('haptic.clock.timer', (err: BusinessError, state: boolean) => {if (err) {console.error(`Failed to query effect. Code: ${err.code}, message: ${err.message}`);return;}console.info('Succeed in querying effect');if (state) {try {// 触发马达振动vibrator.startVibration({type: 'preset',effectId: 'haptic.clock.timer',count: 1,}, {usage: 'unknown'}, (error: BusinessError) => {if (error) {console.error(`Failed to start vibration. Code: ${error.code}, message: ${error.message}`);} else {console.info('Succeed in starting vibration');}});} catch (error) {let e: BusinessError = error as BusinessError;console.error(`An unexpected error occurred. Code: ${e.code}, message: ${e.message}`);}}})} catch (error) {let e: BusinessError = error as BusinessError;console.error(`An unexpected error occurred. Code: ${e.code}, message: ${e.message}`);}}public fileVibration(){const fileName: string = 'vibration.json';// 获取文件资源描述符let rawFd: resourceManager.RawFileDescriptor = getContext().resourceManager.getRawFdSync(fileName);// 触发马达振动try {vibrator.startVibration({type: "file",hapticFd: { fd: rawFd.fd, offset: rawFd.offset, length: rawFd.length }}, {id: 0,usage: 'alarm'}, (error: BusinessError) => {if (error) {console.error(`Failed to start vibration. Code: ${error.code}, message: ${error.message}`);return;}console.info('Succeed in starting vibration');});} catch (err) {let e: BusinessError = err as BusinessError;console.error(`An unexpected error occurred. Code: ${e.code}, message: ${e.message}`);}// 关闭文件资源描述符getContext().resourceManager.closeRawFdSync(fileName);}/*** 按照指定模式停止对应的马达振动，自定义振动不支持此类停止方式*/public stopVibrationByType(){//  停止固定时长振动try {// 按照VIBRATOR_STOP_MODE_TIME模式停止振动vibrator.stopVibration(vibrator.VibratorStopMode.VIBRATOR_STOP_MODE_TIME, (error: BusinessError) => {if (error) {console.error(`Failed to stop vibration. Code: ${error.code}, message: ${error.message}`);return;}console.info('Succeed in stopping vibration');})} catch (err) {let e: BusinessError = err as BusinessError;console.error(`An unexpected error occurred. Code: ${e.code}, message: ${e.message}`);}// 停止预置振动：try {// 按照VIBRATOR_STOP_MODE_PRESET模式停止振动vibrator.stopVibration(vibrator.VibratorStopMode.VIBRATOR_STOP_MODE_PRESET, (error: BusinessError) => {if (error) {console.error(`Failed to stop vibration. Code: ${error.code}, message: ${error.message}`);return;}console.info('Succeed in stopping vibration');})} catch (err) {let e: BusinessError = err as BusinessError;console.error(`An unexpected error occurred. Code: ${e.code}, message: ${e.message}`);}}/*** 停止所有模式的马达振动，包括自定义振动：*/public stopVibration(){try {// 停止所有模式的马达振动vibrator.stopVibration((error: BusinessError) => {if (error) {console.error(`Failed to stop vibration. Code: ${error.code}, message: ${error.message}`);return;}console.info('Succeed in stopping vibration');})} catch (error) {let e: BusinessError = error as BusinessError;console.error(`An unexpected error occurred. Code: ${e.code}, message: ${e.message}`);}}}

振动配置文件：

{"MetaData": {"Create": "2023-01-09","Description": "a haptic case","Version": 1.0,"ChannelNumber": 1},"Channels": [{"Parameters": {"Index": 0},"Pattern": [{"Event": {"Type": "transient","StartTime": 0,"Parameters": {"Frequency": 31,"Intensity": 100}}},{"Event": {"Type": "continuous","StartTime": 40,"Duration": 54,"Parameters": {"Frequency": 30,"Intensity": 38,"Curve": [{"Time": 0,"Frequency": 0,"Intensity": 0},{"Time": 1,"Frequency": 15,"Intensity": 0.5},{"Time": 40,"Frequency": -8,"Intensity": 1.0},{"Time": 54,"Frequency": 0,"Intensity": 0}]}}}]}]
}

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