实现顺序播放音频，开始播放了之后，界面就卡住了（久了之后就会提示：应用没有响应，是否关闭），只有音频在不停地播放

while(beginNum!=cycleNum){
    val pronounce = "https://dict.youdao.com/dictvoice?type=1&audio=${list[beginNum]["wordHead$beginNum"].toString()}"
    val player: MediaPlayer = MediaPlayer.create(lActivity1, Uri.parse(pronounce))
    if (!player.isPlaying){
        player.start() // 开始播放音频
        beginNum++
        list[beginNum]["wordHead$beginNum"].toString()
    }
    try {
        Thread.sleep(2000) //阻断2秒
    } catch (e: InterruptedException) {
        e.printStackTrace()
    }
}