Special test for cold and hot start of app

One 、 Cold and hot start concept

Cold start ： When starting the app , There is no process for this application in the background , At this time, the system will re create a new process to assign to the application , The starting mode is cold starting .

Hot start ： When starting the app , The application process already exists in the background （ example ： Press back key 、home key , The app will exit , However, the process of the application will still remain in the background , You can enter the task list to view ）, So in the case of existing processes , This startup will start the application from the existing process , This startup mode is called hot startup .

Two 、 The core principle

APP Start up time , Can pass adb shell am start -W Ordered TotalTime obtain .

adb shell am start -W -n Package name /Activity name

ThisTime The activity Time to start

TotalTime It takes time to start the application itself =ThisTime+ application application And so on

WaitTime It takes time for the system to start the application =TotalTime+ System resource start time

3、 ... and 、 scripting

import time

import os
def StartApp():
    cmd="adb shell am start -W -n com.weitian.oa/.IndexActivity"
    result=os.popen(cmd)
  return result

def StopApp(mode):
if mode == 'hot':
        cmd = "adb shell input keyevent 3"
        result=os.popen(cmd)
if mode=='cold':
        cmd="adb shell am force-stop com.weitian.oa"
        os.popen(cmd)
def GetStartTime(result,count):
  for one in result.read().splitlines():
if'TotalTime' in one:
            one=one.split(":")[1]
            one=one.strip()
            one=int(one)
            print(f" The first {count} Second startup {one} millisecond ")
            return one

if __name__ == "__main__":
    mod=input(" Hot and cold start test , Please enter the mode ：hot Hot start test ,cold Cold start test ")
    count=int(input(" Please enter the number of tests "))
 if mod=='hot':
        input(" Hot start test , Please make sure app Has been opened and retired to the background \n Press enter to continue ...")
if mod=='cold':
        input(" Cold start test , Please make sure app Not open \n Press enter to continue ...")
    time_list = []
 for i in range(count):
        result=StartApp()
        time_list.append(GetStartTime(result, i + 1))
        time.sleep(3)
        StopApp(mod)
        time.sleep(3)
else:
        print(f" Average startup time {sum(time_list)/count} millisecond ")

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