HarmonyOS 5.0 应用开发——音频播放组件的封装

/** *作者：gxx *时间：2024/11/1 14:32 *功能： **/import { media } from "@kit.MediaKit";import { BusinessError } from "@kit.BasicServicesKit";import { promptAction } from "@kit.ArkUI";
export class MediaPlayer {  private player: media.AVPlayer  private source: media.AVFileDescriptor | string  private state: media.AVPlayerState = 'idle'
  constructor(player: media.AVPlayer, source: media.AVFileDescriptor | string) {    // 创建出来player    this.player = player;    // 设置监听    this.setListener()    this.source = source;    // 设置播放资源    if (typeof source == 'string') {      this.player.url = source    } else {      this.player.fdSrc = source    }  }
  // 设置监听  private setListener() {    // 播放错误    this.player.on('error', (err: BusinessError) => {      console.error('gxxt play err: ', err.message)    })    // 播放完毕    this.player.on("endOfStream", () => {      console.log('gxxt play 完毕')    })    this.player.on("stateChange", (state, reason) => {      // 更新当前状态      this.state = state      switch (state) {        case 'idle':          console.log('gxxt play 刚创建')          break;        case 'initialized':          console.log('gxxt play 初始化好了播放资源')          this.player.prepare()          break;        case 'prepared':          console.log('gxxt  play 准备好的状态')          break;        case 'playing':          console.log('gxxt play 播放中状态')          break;        case 'paused':          console.log('gxxt play 暂停的状态')          break;        case 'stopped':          console.log('gxxt play 停止的状态')          break;        case 'released':          console.log('gxxt play 释放资源')          break;      }    })  }
  play() {    // 如果当前状态是准备态或者暂停可以直接播放  否则先准备    if (this.state == 'prepared' || this.state == 'paused') {      this.player.play()    } else if (this.state == 'stopped') {      this.player.prepare(() => {        // 停止状态进来的 要先准备 再开始播放        this.player.play()      })    }  }
  pause() {    // 只有是播放状态才能暂停    if (this.state == 'playing') {      this.player.pause()    } else {      promptAction.showToast({ message: '当前状态不支持暂停' })    }  }  // 停止播放  stop() {    this.player.stop()  }  //释放资源  release() {    this.player.release()  }
  seekto(time: number) {    // 滑动播放时间    if (time < this.player.duration) {      this.player.seek(time)    }  }}

async aboutToAppear(): Promise<void> {  //   创建播放器  let avplayer = await media.createAVPlayer()  // 获取test.mp3的文件描述符  let filedes = getContext(this).resourceManager.getRawFdSync('test.mp3')  // 创建播放资源  let source: media.AVFileDescriptor = { offset: filedes.offset, fd: filedes.fd, length: filedes.length }  this.player = new MediaPlayer(avplayer, source)}aboutToDisappear(): void {  this.player?.release()  }

Button('播放')  .width('60%')  .margin(20)  .onClick(() => {    this.player?.play()  })Button('暂停')  .width('60%')  .margin(20)  .onClick(() => {   this.player?.pause()  })Button('停止')  .width('60%')  .margin(20)  .onClick(() => {  this.player?.stop()  })