android 检测u盘和sdcard

//方法一 android10 或者一下的应该可以使用 getVolumes()
    int sdCardNum = 0;
    int usbDiskNum = 0;
    StorageManager mStorageManager = getSystemService(StorageManager.class);
    List<VolumeInfo> volumes = mStorageManager.getVolumes();
    //Collections.sort(volumes, VolumeInfo.getDescriptionComparator());
    for (VolumeInfo vol : volumes) {
        if (vol != null) {
            DiskInfo disk = vol.getDisk();
            if (disk.isSd()) {
                sdCardNum++;
            }else if(disk.isUsb()){
                usbDiskNum++;
            }
        }
    }

//另外不能直接调用getVolumes ， 只通过invoke  getVolumes 获取得到 List<VolumeInfo>
    StorageManager mStorageManager = getSystemService(StorageManager.class);
    Class<?> volumeInfoClazz;
    Class<?> diskInfoClaszz;
    try {
        volumeInfoClazz = Class.forName("android.os.storage.VolumeInfo");

        Method StorageManager_getVolumes = Class.forName("android.os.storage.StorageManager")
                .getMethod("getVolumes");

        int sdCardNum = 0;
        int usbDiskNum = 0;
        List<VolumeInfo> volumeInfos = (List<VolumeInfo>) StorageManager_getVolumes
                .invoke(mStorageManager);
        for(VolumeInfo volumeInfo: volumeInfos){

            DiskInfo diskInfo = volumeInfo.getDisk();
            if(diskInfo!=null) {
                boolean isSD = diskInfo.isSd();
                boolean isUSB = diskInfo.isUsb();
                if (isSD) {
                    sdCardNum++;
                }
                if(isUSB){
                    usbDiskNum++;
                }
            }
        }
        Log.d("usb","find sdcard:"+sdCardNum);
        Log.d("usb","find u-disk:"+usbDiskNum);
    }catch (Exception e){
        e.printStackTrace();
    }

   //以上获取的usb u盘数量会在 拔出u盘时不对应，所以可以使用一下方式
    //准确获取u盘插入的个数和信息
    UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
    HashMap<String, UsbDevice> devicelist = usbManager.getDeviceList();
    Log.d("usb","u-diask count:"+devicelist.size());