Get Background Audio Manager

<template>
	<view>
		<page-head :title="title"></page-head>
		<view class="uni-padding-wrap">
			<text>
				注意：1.离开当前页面后背景音乐将保持播放；\n
				2. 硬退出app、调用stop api、播放结束都会清理后台控制中心和锁屏信息显示
			</text>
			<boolean-data :defaultValue="false" title="是否循环播放" @change="setLoop"></boolean-data>
			<view class="uni-common-mt">
				<slider ref="sliderRef" :value="position" :min="0" :max="duration" @changing="onchanging"
					@change="onchange"></slider>
			</view>
			<view class="page-body-buttons">
				<template v-if="playing">
					<view class="page-body-button" @tap="stop">
						<image class="image" src="/static/test-audio/stop.png"></image>
					</view>
					<view class="page-body-button" @tap="pause" style="margin-top: 20px;">
						<image class="image" src="/static/test-audio/pause.png"></image>
					</view>
				</template>
				<template v-if="!playing">
					<view class="page-body-button" @tap="play">
						<image class="image" src="/static/test-audio/play.png"></image>
					</view>
				</template>
				<view class="page-body-button"></view>
			</view>
		</view>
	</view>
</template>
<script setup lang="uts">
	const title = ref("backgroundAudio")
	const sliderRef = ref<UniSliderElement | null>(null)
	const bgAudioMannager = ref(null as BackgroundAudioManager | null)
	const dataUrl = ref('https://web-ext-storage.dcloud.net.cn/uni-app/ForElise.mp3')
	const playing = ref(false)
	const playTime = ref(0)
	const formatedPlayTime = ref('00:00:00')
	const count = ref(100)
	const isPlayEnd = ref(false)
	const duration = ref(100)
	const currentTime = ref(0)
	const _isChanging = ref(false)
	const buffered = ref(0)
	const isLoop = ref(false)

	const position = computed((): number => {
		return isPlayEnd.value ? 0 : currentTime.value;
	})

	const play = () => {
		console.log('play')
		isPlayEnd.value = false;
		bgAudioMannager.value!.play()
	}

	const pause = () => {
		bgAudioMannager.value?.pause();
	}

	const stop = () => {
		bgAudioMannager.value?.stop();
		playing.value = false
	}

	const onchanging = () => {
		_isChanging.value = true;
	}

	const onchange = (e: UniSliderChangeEvent) => {
		let pos = e.detail.value;
		console.log('pos', pos);
		bgAudioMannager.value!.seek(pos);
		_isChanging.value = false;
	}

	const setLoop = () => {
		isLoop.value = !isLoop.value;
		console.log('当前是否设置循环播放，loop= ', isLoop.value);
	}

  onUnload(()=>{
    // #ifdef APP
    bgAudioMannager.value?.offCanplay()
    bgAudioMannager.value?.offEnded()
    bgAudioMannager.value?.offError()
    bgAudioMannager.value?.offNext()
    bgAudioMannager.value?.offPause()
    bgAudioMannager.value?.offPlay()
    bgAudioMannager.value?.offPrev()
    bgAudioMannager.value?.offSeeked()
    bgAudioMannager.value?.offSeeking()
    bgAudioMannager.value?.offStop()
    bgAudioMannager.value?.offTimeUpdate()
    bgAudioMannager.value?.offWaiting()
    // #endif
  })

	onLoad(() => {
		let bgAudioMannagerInstance = uni.getBackgroundAudioManager();
		bgAudioMannagerInstance.title = '致爱丽丝' + count.value;
		bgAudioMannagerInstance.epname = '专辑名：致爱丽丝' + count.value
		bgAudioMannagerInstance.singer = '歌手：暂无' + count.value;
		bgAudioMannagerInstance.coverImgUrl = 'https://web-assets.dcloud.net.cn/unidoc/zh/Alice.jpeg';
		bgAudioMannagerInstance.src = dataUrl.value;
		currentTime.value = bgAudioMannagerInstance.currentTime
		duration.value = bgAudioMannagerInstance.duration
		bgAudioMannagerInstance.onCanplay(() => {
			console.log("音频进入可以播放状态事件");
			buffered.value = bgAudioMannagerInstance.buffered;
			duration.value = bgAudioMannagerInstance.duration
		})
		bgAudioMannagerInstance.onPlay(() => {
			console.log("开始播放");
			playing.value = true;
		})
		bgAudioMannagerInstance.onPause(() => {
			console.log("暂停播放");
			playing.value = false;
		})
		bgAudioMannagerInstance.onStop(() => {
			console.log("停止播放");
			playing.value = false;
		})
		bgAudioMannagerInstance.onEnded(() => {
			if (isLoop.value == false) {
				console.log("播放结束");
				playing.value = false;
				currentTime.value = 0;
				isPlayEnd.value = true;
				sliderRef.value!.value = 0
			} else {
				console.log("播放结束, 开始循环播放");
				bgAudioMannager.value!.src = dataUrl.value;
				bgAudioMannager.value?.play()
			}
		})
		bgAudioMannagerInstance.onNext(() => {
			count.value++
			console.log("下一曲", count.value);
			bgAudioMannager.value?.stop()
			bgAudioMannagerInstance.title = '致爱丽丝' + count.value;
			bgAudioMannagerInstance.singer = '歌手：暂无' + count.value;
			dataUrl.value = 'https://web-ext-storage.dcloud.net.cn/uni-app/ForElise.mp3'
			bgAudioMannagerInstance.coverImgUrl = 'https://qiniu-web-assets.dcloud.net.cn/unidoc/zh/music-a.png';
			bgAudioMannager.value!.src = dataUrl.value;
			bgAudioMannager.value?.play()
		})
		bgAudioMannagerInstance.onPrev(() => {
			count.value--
			console.log("上一曲", count.value);
			bgAudioMannager.value?.stop()
			bgAudioMannagerInstance.title = '致爱丽丝' + count.value;
			bgAudioMannagerInstance.singer = '歌手：暂无' + count.value;
			dataUrl.value = 'https://web-ext-storage.dcloud.net.cn/uni-app/ForElise.mp3'
			bgAudioMannagerInstance.coverImgUrl = 'https://web-assets.dcloud.net.cn/unidoc/zh/Alice.jpeg';
			bgAudioMannager.value!.src = dataUrl.value;
			bgAudioMannager.value?.play()
		})
		bgAudioMannagerInstance.onSeeking(() => {
			console.log('音频进行 seek 操作事件');
		})
		bgAudioMannagerInstance.onSeeked(() => {
			console.log('音频完成 seek 操作事件');
		})
		bgAudioMannagerInstance.onWaiting(() => {
			console.log('音频加载中事件');
		})
		bgAudioMannagerInstance.onTimeUpdate(() => {
			console.log('onTimeUpdate', bgAudioMannagerInstance.currentTime)
			if (_isChanging.value) { return; }
			currentTime.value = bgAudioMannager.value!.currentTime;
			buffered.value = bgAudioMannager.value!.buffered;
			console.log('onTimeUpdateCb', currentTime.value)

			// #ifdef MP
			// 微信小程序安卓端过早的时机获取的buffered、duration为0，改为在此处获取
			if (bgAudioMannager.value!.duration === 0) {
				buffered.value = bgAudioMannager.value!.buffered;
				duration.value = bgAudioMannager.value!.duration
			}
			// #endif
			if (currentTime.value > buffered.value) {
				console.log('缓冲不足');
			}
		})
		bgAudioMannagerInstance.onError((err) => {
			console.log('播放出错err', err);
		})
		bgAudioMannager.value = bgAudioMannagerInstance;
		playing.value = !bgAudioMannagerInstance.paused
		console.log('currentTime=', bgAudioMannager.value!.currentTime, bgAudioMannager.value!.currentTime == 0)
	})

</script>

<style>
	.image {
		width: 75px;
		height: 75px;
	}

	.page-body-text {
		padding: 0 15px;
	}

	.page-body-wrapper {
		margin-top: 0;
	}

	.page-body-info {
		padding-bottom: 25px;
	}

	.time-big {
		font-size: 30px;
		margin: 10px;
	}

	.slider {
		width: 315px;
	}

	.play-time {
		width: 100%;
		padding: 10px 0;
		display: flex;
		justify-content: space-between;
		box-sizing: border-box;
	}

	.page-body-buttons {
		display: flex;
		justify-content: center;
		margin-top: 50px;
		flex-direction: column;
	}

	.page-body-button {
		flex-direction: row;
		justify-content: center;
	}
</style>