Android :: How To Measure Elapsed Time Without Current Time Milli's?
Jul 12, 2009
I want to develop a game, so I need to know elapsed time at lots places in my game. For example, to measuring FPS. I see there is some example use "System.currentTimeMillis" to measure elapsed time. But I see the warning on document: http://developer.android.com/intl/zh-TW/reference/java/lang/System.ht... "This method shouldn't be used for measuring timeouts or other elapsed time measurements, as changing the system time can affect the results." So, if this method should not be used for measuring elapsed time, then what will be suitable?
I'd like to know if there is a way to get the elapsed time since the phone was unplugged from AC supply. I know that I can register a receiver to catch battery events - but this just works if my service is running already when the status changes. In my case I assume that the application is started when the AC supply was already plugged out before and I then want to retrieve the time.
I am getting a date/time string from web in the format of "yyyy/mm/dd'T'HH:MM:SS'Z'" and it is in UTC. Now i have to identify the current time zone of device and then convert this time to my local time. (FYI, Currently, UTC time is 10:25 AM, in india current time is 3:55 PM)
I am writing a app for which i need to display the Time elapsed when user presses a button in UI screen . So please guide me in writing the code in Android. I need to display the time in seconds, mins and hours.
So I've been struggling with this and I am not sure why because it should be simple, but for some reason I just can not get my head around it !!
I am developing a game and when the user saves their game, I write out the last time I checked their stats using System.currentTimeMillis(). Then when they load in the game I want to see how many total seconds have elapsed since it was last saved. Naturally I thought of getting System.currentTimeMillis() and then deducting my saved value and then converting that into seconds using this :=
long timePassed = System.currentTimeMillis() - lastCheck; int seconds = (int) ((timePassed / 1000) % 60);
But on each load the seconds keep altering, but not within the right bounds. For example on one load it comes as 59 seconds, then it showed 23 seconds etc. Obviously my algorithm is slightly wonky but I can't work out why.
I would like to make an app that measures little time intervals (nanoseconds) so I need to know about time resolution and precision regarding such measures with an Android device.
In other words:
- Is it feasible to get reliable values of the current time with nanosecond resolution? - If so, is feasible to measure such little time interavals? I mean, is there any way to tell the app/OS to focus on measuring the time interval specified in the current thread instead of allowing other processes to make the measuring task not precise?
I've tried to measure the time between the execution of two different lines in code but the results are not always the same, somehow random, then I suppose Dalvik and its process management is causing this to be unreliable and random. What I need to do is to measure distances by getting transmission and reception of audio tones of 16-20 KHz (done in  with iOS), thus needing resolution and precision.
As you know, i can use System.currentTimeMillis() to fetch current local time, but how to convert local time to UTC time? the code below, i can get the timezone, utc_bias also can be got
my problem is i can't determine how to use this utc_bias: added or minus to current local time to get UTC time? You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to email@example.com To unsubscribe from this group, send email to firstname.lastname@example.org For more options,
I'm just trying to find the way to get current time. But I don't want to use currentTimeMillis() method, because the current time on device may be wrong. Is there any way to make some request to the Internet to get right current time?
I need to get pure UTC time in application level. It should not be changed by user or location or anything else. When I try with System.currentTimeMillis() or getTime() of Date class, they always return value of local time. If user change date or time, the return value is also changed. I found handleEndOfInit method in android_modem.c (externalqemu elephony) and the method is like below. Probably, the variable "utc" is what I want.
1. Is the android_modem.c for emulator?? 2. If it is, I think there must be similar file for target. Where is it? 3. How can I get the "utc" value in my application?................
I want to get current time accurately. I tried to get the time by "System.currentTimeMillis()" but it has the effect on the modificaion by User. So it is not useful for me. Could you kindly tell me how to get current time accurately?
In my application I will be writing messages to a text file. When I am writing the messages I also want to include the time in it. How do i write in the current date and time? Must I use Calendar now = Calendar.getInstance()?
I am new to the android programming environment. I am currently working on a project which deals with the user's phone battery level.I am showing the current battery level left on the phone.now i want to display the amount of duration of "idle time, talk time, video playback, audio playback and web surfing" that can be done based on the current battery level. What kind of approach shall i follow.(or) What available API shall i use to get those.
at the moment I am thinking about a new app and need some information to decide whether to develop on Android or an alternative OS. I am particularly interested in "time to first screen", "boot-up time", "time to first Audio" and "app-start" (can be any from the android market or even one of the pre-installed ones) time? Does anyone know a source or perhaps measured those numbers?
So I wanted some DigitalClock help. I have set up a digitalclock, and here's what I want to do. Once the clock hit's a certain time, perform an action. How can I control the actions on the digital time to check for a certain time?
Is there any android widget that enable to pick the date and the time at the same time ? I already use the basic date picker and date picker: http://developer.android.com/guide/tutorials/views/hello-timepicker.html http://developer.android.com/guide/tutorials/views/hello-datepicker.html but they are not that sexy and user friendly (I found). Do you know if a widget including both date and time exists? Thanks a lot,WW.