// 文件存储目录
final File folder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath()
+ "/audio");
// audioManager#setSpeakerphoneOn设置为true时, 在盒子上运行一段时间(大约1分钟)后会报错
audioManager.setSpeakerphoneOn(true);