npm install --save pubsub-js
,安装第三方库pubsub-js。import PubSub from "pubsub-js"
,引入第三方库pubsub。id = PubSub.subscribe(消息名,callback)
,且callback的第一个形参默认是消息名,后面则是开发者自己传入的参数。PubSub.publish(消息名,开发者的参数)
。PubSub.unsubscribe(id)
。本例会使用第三方库moment.js来格式化时间。
npm install --save moment
。import moment from "moment";
moment(时间).format(格式);
BackgroundAudioManager
,是全局唯一的背景音频管理器。小程序切入后台,如果音频处于播放状态,可以继续播放。但是后台状态不能通过调用API操纵音频的播放状态。
从微信客户端6.7.2版本开始,如果需要小程序切后台后继续播放音频,需要在全局配置文件 app.json
中配置 requiredBackgroundModes
属性,如:"requiredBackgroundModes": ["audio"]
。
BackgroundAudioManager
实例,可以通过 wx.getBackgroundAudioManager()
获取。BackgroundAudioManager
实例具有如下属性和方法:
title
,音频标题,必填。src
,音频的数据源,默认值是空字符串,非必填。但是,只有设置了src
时,音频才会自动播放。duration
,当前音频的长度,number类型,单位为s,即秒。currentTime
,当前音频的播放位置,number类型,单位为s,即秒。play()
,播放音乐。pause()
,暂停音乐。onPlay(function callback)
,监听背景音频播放事件。onPause(function callback)
,监听背景音频暂停事件。onStop(function callback)
,监听背景音频停止事件。onEnded(function callback)
,监听背景音频自然播放结束事件。onTimeUpdate(function callback)
,监听背景音频播放进度更新事件。代码涉及的主要文件有:
{
"pages": [
"pages/index/index",
"pages/music/music"
],
"window": {
"navigationBarBackgroundColor": "#624d2e",
"navigationBarTitleText": "首页",
"navigationBarTextStyle": "white"
},
"requiredBackgroundModes": [
"audio"
],
"style": "v2",
"sitemapLocation": "sitemap.json"
}
page{
height: 100%;
}
App({
globalData:{
isPlayGlobal:false, //当前是否有歌曲在播放
musicIdGlobal:'' //当前正在播放的歌曲是哪首
}
})
{
"usingComponents": {},
"navigationBarTitleText": "播放列表"
}
<view class="index-container">
<view class="header">
<image src="/static/images/icon-play-square.png">image>
<text>播放全部text>
<text>{{musicList.length}}text>
view>
<scroll-view class="music-list" enable-flex scroll-y >
<view class="music-item" wx:for="{{musicList}}" wx:key="id" bindtap="handleTap" data-musicindex="{{index}}" data-musicitem="{{item}}">
<view class="music-index">{{index+1}}view>
<image class="music-image" src="{{item.picUrl}}">image>
<view class="music-info">
<view class="musci-name">{{item.name}}view>
<view class="music-author">{{item.author}}view>
view>
<image class="btn-more" src="/static/images/icon-more.png">image>
view>
scroll-view>
view>
.index-container{
padding: 20rpx;
background:#624d2e
}
.header{
display: flex;
align-items: center;
}
.header image{
width: 28rpx;
height: 28rpx;
margin-right: 20rpx;
}
.header text{
color: #fff;
height: 28rpx;
line-height: 28rpx;
margin-right: 20rpx;
font-size: 28rpx;
}
.music-list{
margin-top: 20rpx;
color: #fff;
height: calc(100vh - 88rpx);
}
.music-item{
display: flex;
align-items: center;
height: 100rpx;
margin: 20rpx 0;
position: relative;
}
.music-item .music-index{
width: 50rpx;
font-size: 28rpx;
color: #aaa;
}
.music-item .music-image{
width: 80rpx;
height: 80rpx;
border-radius: 6rpx;
margin-right: 20rpx;
}
.music-item .music-info{
display: flex;
flex-direction: column;
}
.music-item .music-info .music-author{
font-size: 24rpx;
color: #aaa;
margin-top: 10rpx;
}
.music-item .btn-more{
width: 36rpx;
height: 36rpx;
position: absolute;
right: 0;
}
import PubSub from "pubsub-js";
const host = "http://localhost:3000";
Page({
data:{
musicList:[], //歌曲列表
musicindex:0 //进入某首歌曲后,记录该歌曲在列表中的索引
},
onLoad(){
this.getDataFromServer();
//接收消息,接收来自页面pages/music/music的消息,根据“上一首”or“下一首”,确定当前应该显示哪首歌曲
PubSub.subscribe("switchsong",(msgName,type) => {
// console.log(msgName,type);
let {musicindex,musicList} = this.data;
if(type === "prev"){
if(musicindex===0) {
musicindex = musicList.length-1;
}else{
musicindex--;
}
}else if(type === "next"){
if(musicindex === musicList.length-1){
musicindex = 0;
}else{
musicindex++;
}
}
this.setData({musicindex});
const music = musicList[musicindex];
//发送消息,告诉页面pages/music/music,告诉它切换完成后的歌曲的详细消息。
PubSub.publish("refreshmusic",music);
})
},
getDataFromServer(){
const result = [
{id:"001",name:"滂沱大雨里","author":"李若溪","picUrl":host+"/images/滂沱大雨里.jpg","url":host+"/audios/滂沱大雨里.mp3",duration:161000},
{id:"002",name:"Last Dance","author":"伍佰","picUrl":host+"/images/Last Dance.jpg","url":host+"/audios/Last Dance.mp3",duration:271000},
{id:"003",name:"国王与乞丐","author":"华晨宇","picUrl":host+"/images/国王与乞丐.jpg","url":host+"/audios/国王与乞丐.mp3",duration:178000},
{id:"004",name:"奇洛李维斯回信","author":"薛凯琪","picUrl":host+"/images/奇洛李维斯回信.jpg","url":host+"/audios/奇洛李维斯回信.mp3",duration:243000},
{id:"005",name:"红日","author":"李克勤","picUrl":host+"/images/红日.jpg","url":host+"/audios/红日.mp3",duration:291000},
{id:"006",name:"快乐崇拜","author":"潘玮柏 张韶涵","picUrl":host+"/images/快乐崇拜.jpg","url":host+"/audios/快乐崇拜.mp3",duration:329000},
{id:"007",name:"门没锁","author":"黄品冠","picUrl":host+"/images/门没锁.jpg","url":host+"/audios/门没锁.mp3",duration:233000},
{id:"008",name:"就是爱你","author":"陶喆","picUrl":host+"/images/就是爱你.jpg","url":host+"/audios/就是爱你.mp3",duration:340000},
{id:"009",name:"快乐的小青蛙","author":"刘士鸣","picUrl":host+"/images/快乐的小青蛙.jpg","url":host+"/audios/快乐的小青蛙.mp3",duration:130000},
{id:"0010",name:"友情岁月","author":"陈小春 郑伊健 谢天华 林晓峰 钱嘉乐","picUrl":host+"/images/友情岁月.jpg","url":host+"/audios/友情岁月.mp3",duration:209000},
{id:"0011",name:"温柔","author":"五月天","picUrl":host+"/images/温柔.jpg","url":host+"/audios/温柔.mp3",duration:269000}
];
this.setData({musicList:result});
},
handleTap(event){
const {musicitem,musicindex} = event.currentTarget.dataset;
this.setData({musicindex})
wx.navigateTo({
url: '/pages/music/music?musicitem='+JSON.stringify(musicitem),
})
}
})
{
"usingComponents": {},
"navigationBarBackgroundColor": "#2f434e",
"navigationBarTitleText": "音乐详情"
}
<view class="music-container">
<view class="music-name">{{music.name}}view>
<view class="music-author">{{music.author}}view>
<image class="arm {{isPlay&&'arm-reset'}}" src="/static/images/arm.png">image>
<view class="disc-container {{isPlay&&'disc-animate'}}">
<image class="disc" src="/static/images/disc.png">image>
<image class="music-image" src="{{music.picUrl}}">image>
view>
<view class="progress-container">
<text class="current-time">{{fmtCurrentTime}}text>
<view class="bar-box">
<view class="current-progress" style="width:{{currentWidth}}rpx">
<view class="progress-circle">view>
view>
view>
<text class="duration">{{fmtDuration}}text>
view>
<view class="player">
<view class="btns">
<image class="loop-btn" src="/static/images/loop.png">image>
<image class="prev-btn" src="/static/images/prev.png" id="prev" bindtap="handleSwitch">image>
<image class="play-btn" src="{{isPlay?'/static/images/stop.png':'/static/images/play.png'}}" bindtap="handlePlay">image>
<image class="next-btn" src="/static/images/next.png" id="next" bindtap="handleSwitch">image>
<image class="list-btn" src="/static/images/list.png">image>
view>
view>
view>
.music-container{
height: 100%;
display: flex;
flex-direction: column;
align-items: center;
background: #2f434e;
position: relative;
}
.music-container .music-name{
margin: 10rpx 0;
color: #fff;
font-size: 36rpx;
}
.music-container .music-author{
color: #bbb;
font-size: 28rpx;
margin: 6rpx 0;
}
.music-container .arm{
width:204rpx;
height: 358rpx;
position: relative;
left: 72rpx;
z-index: 99;
transform: rotate(-15deg);
transform-origin: 30rpx 30rpx;
transition: transform .7s linear;
}
.disc-container{
position: relative;
top: -128rpx;
width: 490rpx;
height: 490rpx;
}
.disc-container .disc{
width: 100%;
height: 100%;
}
.disc-container .music-image{
width: 270rpx;
height: 270rpx;
border-radius: 100%;
position: absolute;
left: 0;right: 0;top: 0;bottom: 0;
margin: auto;
}
.music-container .arm-reset{
transform: rotate(0deg);
}
.disc-animate{
animation: rotate 2.5s 1s linear infinite;
}
@keyframes rotate{
from{
transform: rotate(0deg);
}
to{
transform: rotate(360deg);
}
}
.player{
width: 100%;
position: absolute;
bottom: 60rpx;
}
.btns{
display: flex;
align-items: center;
justify-content: space-evenly;
}
.btns image{
width: 36rpx;
height: 36rpx;
}
.btns .play-btn,.btns .stop-btn{
width: 90rpx;
height: 90rpx;
}
.progress-container {
width: 100%;
display: flex;
justify-content: space-around;
align-items: center;
}
.progress-container .bar-box{
width: 456rpx;
height: 4rpx;
line-height: 4rpx;
background: #888;
}
.bar-box .current-progress{
position: relative;
height: 4rpx;
line-height: 4rpx;
background: #fff;
}
.progress-circle{
width: 16rpx;
height: 16rpx;
border-radius: 50%;
background: #fff;
position: absolute;
right: -16rpx;
top: -6rpx;
}
.progress-container text{
color: #ccc;
font-size: 22rpx;
margin: 0 40rpx;
}
import PubSub from "pubsub-js";
import moment from 'moment';
const appInstance = getApp();
Page({
data:{
isPlay:false,
music:{},
fmtDuration:"00:00",
fmtCurrentTime:"00:00",
currentWidth:0
},
onLoad(options){
const music = JSON.parse(options.musicitem);
let fmtDuration = moment(music.duration).format("mm:ss");
this.setData({music,fmtDuration})
const {isPlayGlobal,musicIdGlobal} = appInstance.globalData;
const {id} = this.data.music;
if(isPlayGlobal && musicIdGlobal === id) {
this.setData({isPlay:true});
}
this.bam = wx.getBackgroundAudioManager();
this.bam.onPlay(() => {
this.setData({isPlay:true})
appInstance.globalData.isPlayGlobal = true;
appInstance.globalData.musicIdGlobal = this.data.music.id;
})
this.bam.onPause(() => {
this.setData({isPlay:false})
appInstance.globalData.isPlayGlobal = false;
})
this.bam.onStop(() => {
this.setData({isPlay:false})
appInstance.globalData.isPlayGlobal = false;
})
this.bam.onEnded(() => {
// this.setData({isPlay:false});
// appInstance.globalData.isPlayGlobal = false;
// 音乐自然播放结束,则切换至下一首
PubSub.publish("switchsong","next");
//接收消息,接收来自pages/index/index的消息,显示切换后的歌曲详情
const eventId = PubSub.subscribe("refreshmusic",(msgName,music) => {
PubSub.unsubscribe(eventId);
this.setData({music})
this.musicControl();
const fmtDuration = moment(this.data.music.duration).format("mm:ss");
this.setData({fmtDuration,fmtCurrentTime:"00:00"})
})
})
this.bam.onTimeUpdate(() => {
const currentWidth = Math.floor(456 * this.bam.currentTime / this.bam.duration);
const fmtCurrentTime = moment(this.bam.currentTime * 1000).format("mm:ss");
this.setData({currentWidth,fmtCurrentTime});
})
},
handlePlay(){
const isPlay = !this.data.isPlay;
this.setData({isPlay});
this.musicControl();
},
musicControl(){
const {isPlay} = this.data;
if(isPlay){
this.bam.src = this.data.music.url;
this.bam.title = this.data.music.name;
}else{
this.bam.pause();
}
},
handleSwitch(event){
const type = event.target.id;
//发送消息,告诉pages/index/index:切上一首还是下一首。prev代表切上一首,next代表切下一首。
PubSub.publish("switchsong",type);
//接收消息,接收来自pages/index/index的消息,显示切换后的歌曲详情
const eventId = PubSub.subscribe("refreshmusic",(msgName,music) => {
PubSub.unsubscribe(eventId);
this.setData({music})
this.musicControl();
})
}
})