public static boolean isSdcardExists(Context context) {  StorageManager storageManager = StorageManager.from(context.getApplicationContext());  List<VolumeInfo> volumes = storageManager.getVolumes();  for (VolumeInfo volInfo : volumes) {   DiskInfo diskInfo = volInfo.getDisk();   if (diskInfo != null && diskInfo.isSd()) {    String sdcardState = volInfo.getEnvironmentForState(volInfo.getState());    if (Environment.MEDIA_MOUNTED.equals(sdcardState)) {     return true;    }   }  }  return false; }

public static int isudiskExists(Context context) {  int num = 0;  StorageManager storageManager = StorageManager.from(context.getApplicationContext());  List<VolumeInfo> volumes = storageManager.getVolumes();  for (VolumeInfo volInfo : volumes) {   DiskInfo diskInfo = volInfo.getDisk();   if (diskInfo != null && diskInfo.isUsb()) {    String sdcardState = volInfo.getEnvironmentForState(volInfo.getState());    if (Environment.MEDIA_MOUNTED.equals(sdcardState)) {     num++;    }   }  }  return num; }