fix: uni.getBackgroundAudioManager 不触发 onTimeUpdate 回调的问题

src/platforms/app-plus/service/api/context/background-audio.js

@@ -6,7 +6,10 @@ import {
   publish
 } from '../../bridge'
 
-let audio
+let audio
+
+let timeUpdateTimer = null
+const TIME_UPDATE = 250
 
 const publishBackgroundAudioStateChange = (state, res = {}) => publish('onBackgroundAudioStateChange', Object.assign({
   state
@@ -28,10 +31,16 @@ function initMusic () {
     audio.addEventListener(event, () => {
       // 添加 isStopped 属性是为了解决 安卓设备停止播放后获取播放进度不正确的问题
       if (event === 'play') {
-        audio.isStopped = false
+        audio.isStopped = false
+        startTimeUpdateTimer()
       } else if (event === 'stop') {
         audio.isStopped = true
-      }
+      }
+
+      if (event === 'pause' || event === 'ended' || event === 'stop') {
+        stopTimeUpdateTimer()
+      }
+
       const eventName = `onMusic${event[0].toUpperCase() + event.substr(1)}`
       publish(eventName, {
         dataUrl: audio.src,
@@ -42,12 +51,14 @@ function initMusic () {
       })
     })
   })
-  audio.addEventListener('waiting', () => {
+  audio.addEventListener('waiting', () => {
+    stopTimeUpdateTimer()
     publishBackgroundAudioStateChange('waiting', {
       dataUrl: audio.src
     })
   })
-  audio.addEventListener('error', err => {
+  audio.addEventListener('error', err => {
+    stopTimeUpdateTimer()
     publish('onMusicError', {
       dataUrl: audio.src,
       errMsg: 'Error:' + err.message
@@ -60,7 +71,20 @@ function initMusic () {
   })
   audio.addEventListener('prev', () => publish('onBackgroundAudioPrev'))
   audio.addEventListener('next', () => publish('onBackgroundAudioNext'))
-}
+}
+
+function startTimeUpdateTimer () {
+  stopTimeUpdateTimer()
+  timeUpdateTimer = setInterval(() => {
+    publishBackgroundAudioStateChange('timeUpdate', {})
+  }, TIME_UPDATE)
+}
+
+function stopTimeUpdateTimer () {
+  if (timeUpdateTimer !== null) {
+    clearInterval(timeUpdateTimer)
+  }
+}
 
 function setMusicState (args) {
   initMusic()