plus 解决uni-app播放多音频背景音乐

播放音频文件

let audioPlayer = null;  

// #ifdef APP-PLUS  
// 背景音乐文件  
let path = plus.io.convertLocalFileSystemURL("_www/static/audio/background_music.mp3");  
if (plus.os.name == 'Android') {  
    let MediaPlayer = plus.android.importClass("android.media.MediaPlayer");  
    audioPlayer = new MediaPlayer()  
    audioPlayer.setDataSource(path); //指定音频文件路径  
    audioPlayer.setLooping(true); //设置为循环播放  
    audioPlayer.prepare(); //初始化播放器MediaPlayer  
    audioPlayer.start();  
    // 获取音乐的总时长  
    console.log(audioPlayer.getDuration());  
}  
if (plus.os.name == "iOS") {  
    let NSData = plus.ios.importClass("NSData");  
    let AVAudioPlayer = plus.ios.importClass("AVAudioPlayer");  
    let pathFileData = NSData.dataWithContentsOfFile(path);  
    audioPlayer = new AVAudioPlayer();  
    audioPlayer.initWithDataerror(pathFileData, null);  
    audioPlayer.setNumberOfLoops(-1); //-1：无限循环   
    audioPlayer.prepareToPlay(); //初始化播放器  
    audioPlayer.play();  
    // 获取音乐的总时长  
    console.log(audioPlayer.duration());  
}  
// #endif

调节系统媒体音量

let AudioManager = null;  
let audioManager = null;  

/// 获取系统音量控制  
// #ifdef APP-PLUS  
if (plus.os.name == 'Android') {  
    let context = plus.android.importClass("android.content.Context");  
    let main = plus.android.runtimeMainActivity();  
    AudioManager = plus.android.importClass("android.media.AudioManager");  
    audioManager = main.getSystemService(context.AUDIO_SERVICE);  
    // 调节是否显示调节ui  
    // audioManager.adjustStreamVolume (AudioManager.STREAM_MUSIC , AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI)  
    // 音量最大范围  
    let max = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);  
    // 当前音量值  
    let current = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);  
    console.log(max, current);  
}  
if (plus.os.name == "iOS") {  
    // 暂无查找  
}  
// #endif  

// 设置音量值  
// #ifdef APP-PLUS  
if (plus.os.name == 'Android') {  
    audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 89, 0); // 89为音量值  
}  
if (plus.os.name == "iOS") {  
    // 暂无查找  
}  
// #endif