背景
制作的H5项目,使用vedio标签,利用wx.getNetworkType来自动播放背景音乐。
但是安卓的vedio自动播放被微信浏览器限制了。
解决方案
采用web vedio api
细节解释:
web vedio api MDN
伸手
/*** @author ccbbs* @file 解决安卓webview自动播放背景音乐的问题*/function BGMAutoPlayMgr/* solveAndroidBGMAutoplay */(url) {this.audioContext = new (window.AudioContext || window.webkitAudioContext || window.mozAudioContext)();this.sourceNode = null;this.buffer = null;this.isPlayingBGM = false;this.toggleBGM = function () {if (typeof this.sourceNode == 'object') {if (this.isPlayingBGM) {this.sourceNode.stop();this.isPlayingBGM = false;} else this._playSourceNode();}}this._playSourceNode = function () {const audioContext = this.audioContext;audioContext.resume();const _sourceNode = audioContext.createBufferSource();_sourceNode.buffer = this.buffer;_sourceNode.loop = true;_sourceNode.connect(audioContext.destination);_sourceNode.start(0);this.sourceNode = _sourceNode;this.isPlayingBGM = true;}let loadAndAutoPlay = (audioUrl) => {const audioContext = this.audioContext;const xhr = new XMLHttpRequest();xhr.open('GET', audioUrl, true);xhr.responseType = 'arraybuffer';xhr.onreadystatechange = () => {if (xhr.status < 400 && xhr.status >= 200 && xhr.readyState === 4) {audioContext.decodeAudioData(xhr.response, buffer => {this.buffer = buffer;WeixinJSBridge.invoke("getNetworkType", {}, () => this._playSourceNode());});}}xhr.send();}loadAndAutoPlay(url);loadAndAutoPlay = null;}/* 使用示例const bgm = new BGMAutoPlayMgr('http://192.168.1.1:8080/bgm.mp3');function toggleBGM() {bgm.toggleBGM();} */
使用示例
调用:实例化类,并传入背景音乐的网络url
const bgm = new BGMAutoPlayMgr('http://192.168.1.1:8080/bgm.mp3');
开关背景音乐:调用实例的toggleBGM方法。注意需要在已经自动播放后进行调用
bgm.toggleBGM();
本文作者北京亿众互动:ccbbs
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