code: public static boolean checkIfFileExists(String filePath) {
          File file = new File(filePath);// getSDCardPath(), filePath);
          return (file.exists() ? true : false);
      }
docs: Check if file exists on SDCard or not
  
  @param filePath - its the path of the file after SDCardDirectory (no need for
  getExternalStorageDirectory())
  @return boolean - if file exist on SDCard or not