最近在写一个艾美食艾音乐的微信小程序,其中有用到音乐播放的功能,基本播放切换功能已经实现,但是在反复切换歌曲、重新进入歌曲以及单曲循环、列表循环的测试过程中还是发生了bug,特此写一篇文章,捋一下思路.(功能写到后面小程序官方文档将音频这一块全都更新了...)
坑点:由于小程序主体部分没有app.wxml,这就导致小程序不能写一些公共的页面结构,如果有相同的部分,只能封装成组件再引入.
在我们点击歌曲列表中的某首歌的时候,会进入音乐播放界面,当我们退出音乐播放界面,歌曲仍然继续播放,但此时由于退出当前路由,页面data中的数据也已被销毁,当我们再次进入播放界面相当于重新进行页面加载,所以需要我们进行分情况判断,播放歌曲变的较为复杂.
一.存放公共数据
在我们进入音乐播放界面之前要存一下:
当前专辑信息:album(Object)
当前播放列表:playList(Array)
当前播放歌曲的index:playIndex(Number)
播放模式:mode(String)
封面旋转的角度:imgRotate(Number)
// app.js
globalData: { album: null, // 当前专辑信息 playList: [], // 当前播放列表 playIndex: 0, // 当前播放歌曲index mode: \'multiple\', // 循环模式 multiple: 循环播放, single: 单曲循环 imgRotate: 0, // 封面旋转角度
}
二.专辑列表
在专辑列表中点击某个专辑,进入该专辑的歌曲列表,同时将 该专辑的信息 存入globalData.
// music.js
gotoSongList(e) { let item = e.currentTarget.dataset.type app.globalData.album = item // 将专辑信息存入globalData wx.navigateTo({ url: \'../songlist/songlist\' }) }
三.歌曲列表
在歌曲列表中点击播放某首歌时,进入歌曲播放界面,同时将 该专辑的歌曲列表、当前播放歌曲的index 存入globalData.
// songlist.js // 播放歌曲 play(e) { app.globalData.playList = this.data.songList let index = e.currentTarget.dataset.index app.globalData.playIndex = index let url = \'../player/player\' wx.navigateTo({ url: url }) }
四.歌曲播放页面
需要在data中存放一下信息:
当前歌曲信息:item(Object)
歌曲解析后的歌词:parseLyric(String)
当前播放进度点的歌词:lineLyric(String)
播放模式:mode(String)
封面旋转的角度:imgRotate(Number)
进度条的值:SliderValue(Number)
音频的长度:duration(Number)
音频的播放位置:currentPosition(Number)
播放状态:playStatus(Boolean)
const app = getApp(); var Base64 = require(\'../../utils/base64.js\').Base64 var Lyric = require(\'../../utils/lyric-parse.js\') Page({ data: { item: {}, // 当前歌曲信息 parseLyric: \'\', // 歌曲解析后的歌词 lineLyric: \'\', // 当前播放进度点的歌词 mode: \'\', // 播放模式 imgRotate: 0, // 封面旋转的角度 sliderValue: 0, // 进度条的值 duration: 0, // 音频的长度(单位:s) currentPosition: 0, // 音频的播放位置(单位:s) playStatus: 0, // 播放状态 timee: 0, // 定时器 根据歌曲进度改变slider进度 coverImg: \'\', // 封面图片 isDel: false, // 当前列表是否只有一首歌曲 }, onLoad() { let item = app.globalData.playList[app.globalData.playIndex] let album = app.globalData.album // 获取背景音频信息 const backgroundAudioManager = wx.getBackgroundAudioManager() console.log(backgroundAudioManager, \'backgroundAudioManager\') if (backgroundAudioManager.src == item.src) { // 继续听歌 console.log(\'继续听歌\') } else { // 播放新歌 app.globalData.imgRotate = 0 console.log(\'播放新歌\') backgroundAudioManager.title = item.name backgroundAudioManager.epname = album.name backgroundAudioManager.singer = item.author backgroundAudioManager.coverImgUrl = album.poster // 设置了 src 之后会自动播放 backgroundAudioManager.src = item.src } let lyric = Base64.decode(item.lyric) this.setData({ item: item, coverImg: album.poster, playStatus: !backgroundAudioManager.paused, duration: this.stotime(backgroundAudioManager.duration), currentPosition: this.stotime(backgroundAudioManager.currentTime), parseLyric: new Lyric(lyric, this.handleLyric), mode: app.globalData.mode, imgRotate: app.globalData.imgRotate }) this.data.parseLyric.seek(backgroundAudioManager.currentTime*1000) console.log(this.data.playStatus, \'playStatus\') if (backgroundAudioManager.paused) { this.data.parseLyric.togglePlay() } else if (!this.data.timee) { this.toRotate() } backgroundAudioManager.onPlay(this.onPlay) // 监听背景音频播放事件 backgroundAudioManager.onPause(this.onPause) // 监听背景音频暂停事件 backgroundAudioManager.onTimeUpdate(this.onTimeUpdate) // 监听背景音频播放进度更新事件 backgroundAudioManager.onEnded(this.onEnded) // 监听背景音频自然播放结束事件 wx.setNavigationBarTitle({ title: item.name }) console.log(app.globalData.playList.length, \'app.globalData.playList.length\') if (app.globalData.playList.length == 1) { this.setData({ isDel: true }) } }, handleLyric({lineNum, txt}) { // 歌词回调 console.log(lineNum, txt, \'txt\') this.setData({ lineLyric: txt }) }, onPlay() { const backgroundAudioManager = wx.getBackgroundAudioManager() console.log(\'onPlay\') console.log(backgroundAudioManager.duration, \'backgroundAudioManager.duration\') this.setData({ playStatus: true }) this.data.parseLyric.seek(backgroundAudioManager.currentTime*1000) this.toRotate() }, onPause() { clearInterval(this.data.timee) this.data.parseLyric.stop() console.log(\'onPause\') this.setData({ playStatus: false }) }, switch() { // 切换歌曲播放状态 if (this.data.playStatus) { // 切换为暂停状态 const backgroundAudioManager = wx.getBackgroundAudioManager() backgroundAudioManager.pause() } else { // 切换为播放状态 const backgroundAudioManager = wx.getBackgroundAudioManager() backgroundAudioManager.play() } }, onTimeUpdate() { const backgroundAudioManager = wx.getBackgroundAudioManager() let sliderValue = backgroundAudioManager.currentTime / backgroundAudioManager.duration * 100 this.setData({ currentPosition: this.stotime(backgroundAudioManager.currentTime), sliderValue: sliderValue, duration: this.stotime(backgroundAudioManager.duration) }) // this.data.parseLyric.seek(backgroundAudioManager.currentTime*1000) }, toRotate() { this.data.timee && clearInterval(this.data.timee) this.data.timee = setInterval(() => { app.globalData.imgRotate = app.globalData.imgRotate + 0.8 this.setData({ imgRotate: app.globalData.imgRotate }) }, 35) }, onEnded() { console.log(\'onEnded\') this.setData({ playStatus: false }) if (this.data.mode == \'multiple\') { this.cutNext() } else { const backgroundAudioManager = wx.getBackgroundAudioManager() // 设置了 src 之后会自动播放 backgroundAudioManager.src = this.data.item.src } }, slideChange(e) { // 拖动滑块 let value = e.detail.value this.setData({ sliderValue: value }) const backgroundAudioManager = wx.getBackgroundAudioManager() let currentTime = (value / 100) * backgroundAudioManager.duration backgroundAudioManager.seek(currentTime) this.data.parseLyric.seek(currentTime*1000) }, cutPrev() { // 上一首 this.delSongChange(\'prev\') }, cutNext() { // 下一首 this.delSongChange(\'next\') }, delSongChange(type) { // 切换歌曲 if (this.data.duration !== 0 && !this.data.isDel) { if (app.globalData.playList.length > 1) { clearInterval(this.data.timee) } this.data.duration = 0 this.data.parseLyric.stop() if (type == \'prev\') { if (app.globalData.playIndex > 0) { app.globalData.playIndex -- } else { app.globalData.playIndex = app.globalData.playList.length - 1 } } else { if (app.globalData.playIndex < app.globalData.playList.length - 1) { app.globalData.playIndex ++ } else { app.globalData.playIndex = 0 } } let item = app.globalData.playList[app.globalData.playIndex] wx.setNavigationBarTitle({ title: item.name }) const backgroundAudioManager = wx.getBackgroundAudioManager() backgroundAudioManager.title = item.name backgroundAudioManager.singer = item.author // 设置了 src 之后会自动播放 backgroundAudioManager.src = item.src let lyric = Base64.decode(item.lyric) this.setData({ item: item, playStatus: !backgroundAudioManager.paused, parseLyric: new Lyric(lyric, this.handleLyric) }) this.data.parseLyric.seek(backgroundAudioManager.currentTime*1000) console.log(this.data.playStatus, \'playStatus\') if (backgroundAudioManager.paused) { this.data.parseLyric.togglePlay() } } }, // 改变播放模式 changeMode() { if (this.data.mode == \'multiple\') { this.setData({ mode: \'single\' }) } else { this.setData({ mode: \'multiple\' }) } app.globalData.mode = this.data.mode }, // 时间格式转换 stotime(s) { let t = \'\' if (s > -1) { let min = Math.floor(s / 60) % 60; let sec = Math.floor(s) % 60 if (min < 10) { t += \'0\' } t += min + \':\' if (sec < 10) { t += \'0\' } t += sec } return t }, onUnload() { // 页面卸载 const backgroundAudioManager = wx.getBackgroundAudioManager() backgroundAudioManager.onTimeUpdate() backgroundAudioManager.onPlay() backgroundAudioManager.onPause() this.data.parseLyric.stop() clearInterval(this.data.timee) }, })
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