保存bitmap对象到SD卡

public static void saveBitmapToSDCard(Bitmap bitmap,String imagename)   {       FileOutputStream fos = null;       try {           fos = new FileOutputStream("/sdcard/Images/" + "img-"+imagename + ".jpg");         if (fos != null) {        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);               fos.close();           }       } catch (Exception e) {           e.printStackTrace();       }   }