Android文件递归遍历

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {    //判断SD卡是否可用
File file = new File(path);
File[] files = file.listFiles();
for (File filename : files) {
if (filename.isDirectory()) {    //如果是文件夹
//递归
btnLoad(filename.getAbsolutePath());
} else {
String[] filePath = filename.getName().toString().split("\\.");
if (filePath.length == 2) {
if (filePath[1].equals("mp3") ||
}
}
}
}
}