引用：app.flow.flowentity

流程環(huán)節(jié)(Class):FlowActivity

getActivity：獲取環(huán)節(jié)標(biāo)識

getActivityname：獲取環(huán)節(jié)名稱

getBeforeActivity(self):  # 獲取前序環(huán)節(jié)

返回：list<FlowActivity>

getAfterActivity(self):  # 獲取后續(xù)環(huán)節(jié)

返回：list<FlowActivity>

getTaskAfterActivity(self, flowID, taskID, sData1):  # 獲取流程后續(xù)環(huán)節(jié)