code: public String getApplicationId() {
  		String applicationId = null;
  		Integer applicationIdObject = querySingleTypedResult(
  				"PRAGMA application_id", null, GeoPackageDataType.MEDIUMINT);
  		if (applicationIdObject != null) {
  			try {
  				applicationId = new String(ByteBuffer.allocate(4)
  						.putInt(applicationIdObject).array(), "UTF-8");
  			} catch (UnsupportedEncodingException e) {
  				throw new GeoPackageException(
  						"Unexpected application id character encoding", e);
  			}
  		}
  		return applicationId;
  	}
docs: Get the application id
  
  @return application id
  @since 1.2.1