audio通知栏切换歌曲停止播放,怎么破

问题描述:

音乐播放过程中,切换到应用其他页面时,用后台的状态栏切换音乐时音乐会暂停。

问题分析:

华为audio接口只能在页面中使用,当audio所在的页面退出后,页面销毁,绑定的上下文对象也随之不存在。 此时,在通知栏上一首、下一首切换歌曲时,后台播放服务首先暂停当前歌曲,状态重置,但是audio接口的绑定事件找不到上下文对象,无法触发previous和next事件,导致上述现象。

解决方案:

在应用首页监听audio事件,而不仅仅是在播放页面添加,当用户离开播放页面时,依然可以监听到audio的每个事件,从而去控制播放逻辑。

注意:由于华为快应用引擎不支持在app.ux里调用audio接口,所以当用户退出了整个应用,虽然后台依然在播放,但是快应用是不能收到audio的事件回调的。

实现代码:

以下示例demo中有两个页面:首页Main和音频Audio。为了避免重复代码,可维护性,将audio的相关代码独立出来作为一个公共的js,方便每个页面调用。

1)公共utils.js:

import audio from '@system.audio';
export default{
     listenAudio() {
         var that=this;
        console.info("util.js listenAudio ");
        audio.onplay = function () {
            console.log('audio onplay')
          }
        audio.onpause = function () {
            console.log('audio onpause')
          }

          audio.onended = function () {
            console.log('audio onended')
          }

          audio.ondurationchange = function () {
            console.log('util.js ondurationchange')
            var total = audio.duration
            console.log('util.js ondurationchange total=' + total)
          }

          audio.ontimeupdate = function () {
            var time = audio.currentTime
          //  console.log('util.js ontimeupdate time=' + time)
          }

        audio.onprevious = function () {
            audio.cover = 'https://xx.jpg'
            audio.title = "钢琴曲"
            audio.artist = "莫扎特"
            // Replace with NetEase cloud music resource link
            audio.src = 'https://xx.mp3'
            console.log(' util.js on previout event from notification ')
        }

        audio.onnext = function () {
            audio.cover = 'xx.jpg'
            audio.title = '轻音乐';
            audio.artist = '王菲'
            // Replace with NetEase cloud music resource link
            audio.src = 'https://xx.mp3'
            console.log(' util.js on next event from notification ')
        }
    },

     getAudioPlayState() {
        audio.getPlayState({
            success: function (data) {
                console.log(`getAudioPlayState success: state: ${data.state},src:${data.src},
                      currentTime:${data.currentTime},autoplay:${data.autoplay},loop:${data.loop},
                      volume: ${data.volume},muted:${data.muted},notificationVisible:${data.notificationVisible}`);
                                 },
            fail: function (data, code) {
                console.log('getAudioPlayState fail, code=' + code);
                            }
        });
    },

     startPlay() {
        audio.play();
    },

     pausePlay() {
        audio.pause();
    },

     stopPlay() {
        audio.stop();
    },

     seekProress(len) {
        audio.currentTime = len;
    },

     setVolume(value) {
        audio.volume = value;
    },

     setMute(isMuted) {
        audio.muted = isMuted
    },

     setLoop(isloop) {
        audio.loop = isloop
    },

     setStreamType() {
        if (audio.streamType === 'music') {
            audio.streamType = 'voicecall'
        } else {
            audio.streamType = 'music'
        }
        console.error('audio.streamType =' + audio.streamType);
    },

     setTitle(title) {
        console.info('setTitle=' + title);
        audio.title = title;
    },

     setArtist(artist) {
        console.info('setArtist artist=' + artist) ;
        audio.artist = artist;
    },

     setCover(src) {
        console.info('setCover src=' + src);  
        audio.cover = src;
    }
}

2) 在首页Main的生命周期onShow方法中添加监听audio事件,调用utils.js中的listenAudio,代码如下:

<script>
  import utils from '../Util/utils.js';
  module.exports = {
    onShow(options) {
       utils.listenAudio();
    },
  }
</script>

3) 在音频Audio页面生命周期onShow方法中添加监听audio事件,调用utils.js中的listenAudio,由于在播放页面需要显示播放进度,单独监听了进度回调事件,代码如下:

onShow(options) {
      var that = this;
      utils.listenAudio();
      audio.ondurationchange = function () {
        console.log('audio ondurationchange')
        that.total = audio.duration
        console.log('audio ondurationchange total=' + that.total)
      }

      audio.ontimeupdate = function () {
        that.time = audio.currentTime
        console.log('ontimeupdate time=' + that.time)
      }
    },

欲了解更多详情,请参见:

快应用audio开发指导:

https://developer.huawei.com/consumer/cn/doc/development/quickApp-References/quickapp-api-audio


原文链接:https://developer.huawei.com/consumer/cn/forum/topic/0204411131669010359?fid=18

原作者:Mayism

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