Calculate Duration | 易学教程

问题

I have a small android problem, I have a requirement to have a timer to calculate the duration from the time a specific activity was open till a certain button in that activity is clicked, simply how long the activity was open. While googling around I found TimerTask but this seems to run a thread for a certain interval only though and doesent seem ideal for the job from my little Android experience

Any idea on how to calculate the duration? Preferably in a very simple manner

Any help is very welcome

Regards, MilindaD

回答1:

Just use System.currentTimeMillis() to capture the time when the activity starts and stops. E.g.:

long startTime = System.currentTimeMillis();
// wait for activity here
long endTime = System.currentTimeMillis();
long seconds = (endTime - startTime) / 1000;

回答2:

As of Java 8 there is more convenient way of doing this.

Instant start = Instant.now();
...
Duration.between(start, Instant.now())

Benefit of this approach is more flexible API provided by the Duration class.

https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html

回答3:

If you want to find out how long activity is open.

You can write respective code in

onCreate() method and onDestory() method. or

onResume() method onPause() method.

depending on your need.

and make use of following code

long t1 =  new Date().getTime();
long  t2 = new Date().getTime();
long t3 =  t2 - t1;

回答4:

group: 'org.apache.commons',name: 'commons-lang3'

 StopWatch stopWatch = new StopWatch();
 stopWatch.start();
       ...
 stopWatch.stop();
 stopWatch.getTime(TimeUnit.SECONDS);

来源：https://stackoverflow.com/questions/5562550/calculate-duration

标签

java

android

time

duration