Activity Lifecycle + system.currentTimeMillis()

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Activity Lifecycle + system.currentTimeMillis()

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This activity is about life cycle on Android, I read several materials but I’m still lost? Can someone please explain.

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What you don’t understand?

– Márcio Oliveira

2017/05/19 at 00:34
I don’t know how to apply a logic to take the time stopped and the time paused, as Timemillis applies?

– Rodrigo Costa

2017/05/19 at 13:51
The System.currentTimeMillis() returns a number that represents the current date and time in milliseconds (like, how many milliseconds have passed since the default date, I think 1/1/1970 so far), so you save in a variable, for example "timeInitial = System.currentTimeMillis()". When you want to measure the time passed from the initial time, you will call the currentTimeMillis again, which will generate a number greater than the first and will catch the difference between them (in milliseconds), then only convert to the unit you want (minutes, seconds, etc)

– Márcio Oliveira

2017/05/19 at 14:14
I understood the idea of taking the initial time and calculating.

– Rodrigo Costa

2017/05/19 at 14:53
Can you give an example of even basic implementation? and the counter works like inside onStop, onStart...?

– Rodrigo Costa

2017/05/19 at 15:04
protected void onStart()' super.onStart(); system.out.println(System.currentTimeMillis()); } In the case it has to be displayed in a Textview

– Rodrigo Costa

2017/05/19 at 15:28

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by Márcio Oliveira • **2,237** points · Answer 1 · 2017-05-19T14:24:50+00:00

Take a look here: https://www.tutorialspoint.com/java/lang/system_currenttimemillis.htm

Explain in more detail what I quoted in my last comment. But basically the logic is you use System.currentTimeMillis() to go saving timeframes that you’ll want to measure: when Activity starts, when it pauses, etc.

To measure the time spent between these milestones, just take the difference between them, which will be a value in milliseconds, then just convert to the unit you want (minutes, seconds, etc).