android 删除SD卡或者手机的缓存图片和目录

        public static final String TEMP_PHOTO_FILE_NAME = "temp_photo.jpg";

private static String mSdRootPath = Environment.getExternalStorageDirectory().getPath();    /**      * 删除SD卡或者手机的缓存图片和目录      */      public void deleteFile() {      Log.i("INFO", mSdRootPath+"/"+TEMP_PHOTO_FILE_NAME+"========================");        File dirFile = new File(mSdRootPath+"/"+TEMP_PHOTO_FILE_NAME);         if(! dirFile.exists()){             return;          }          if (dirFile.isDirectory()) {              String[] children = dirFile.list();              for (int i = 0; i < children.length; i++) {                  new File(dirFile, children[i]).delete();              }          }                   dirFile.delete();     }