system-clock

问题 I want to understand the time information on the dumpsys gfxinfo log. It looks like this: Applications Graphics Acceleration Info: Uptime: 16264702 Realtime: 28169900 Can anyone tell me how to associate these figures with System.currentTimeMillis()? 回答1: From ActivityManagerService.java: long uptime = SystemClock.uptimeMillis(); long realtime = SystemClock.elapsedRealtime(); pw.println("Applications Graphics Acceleration Info:"); pw.println("Uptime: " + uptime + " Realtime: " + realtime);

问题 I want to understand the time information on the dumpsys gfxinfo log. It looks like this: Applications Graphics Acceleration Info: Uptime: 16264702 Realtime: 28169900 Can anyone tell me how to associate these figures with System.currentTimeMillis()? 回答1: From ActivityManagerService.java: long uptime = SystemClock.uptimeMillis(); long realtime = SystemClock.elapsedRealtime(); pw.println("Applications Graphics Acceleration Info:"); pw.println("Uptime: " + uptime + " Realtime: " + realtime);

问题 We have a situation where a master process writes to a log. It then spawns multiple worker processes which write to their own logs. (I wanted the workers to log through the master, but there was resistance to this idea for some reason.) What I want to know is, can I trust that the timestamps that end up in the multiple files are consistent with each other? i.e., if I merge the log files into a single file sorting by instant, will the order of events be true? Across all possible operating

问题 We have a situation where a master process writes to a log. It then spawns multiple worker processes which write to their own logs. (I wanted the workers to log through the master, but there was resistance to this idea for some reason.) What I want to know is, can I trust that the timestamps that end up in the multiple files are consistent with each other? i.e., if I merge the log files into a single file sorting by instant, will the order of events be true? Across all possible operating

问题 We have a situation where a master process writes to a log. It then spawns multiple worker processes which write to their own logs. (I wanted the workers to log through the master, but there was resistance to this idea for some reason.) What I want to know is, can I trust that the timestamps that end up in the multiple files are consistent with each other? i.e., if I merge the log files into a single file sorting by instant, will the order of events be true? Across all possible operating

问题 My code was working just fine. Today suddenly I started getting this exception - org.threeten.bp.DateTimeException: Field DayOfMonth cannot be printed as the value 1872095944 max width is 2 This is my simple code : LocalDateTime date = LocalDateTime.now(); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd - MM - uuuu"); String sDate = date.format(formatter);//EXCEPTION THROWN HERE Why this problem suddenly? EDIT This seems to be an intermediate problem. It crashes sometimes and

问题 I just came across the following paragraph in the AppEngine documentation for Query Cursors: An interesting application of cursors is to monitor entities for unseen changes. If the app sets a timestamp property with the current date and time every time an entity changes, the app can use a query sorted by the timestamp property, ascending, with a Datastore cursor to check when entities are moved to the end of the result list. If an entity's timestamp is updated, the query with the cursor

问题 The Android docs on uptimeMillis() says: Returns milliseconds since boot, not counting time spent in deep sleep. Note : This value may get reset occasionally (before it would otherwise wrap around). It seems quite strange that the docs are worried about it ever wrapping around. After all, the method returns a long. A quick calculation yields that it would take approximately 292,271,023 years for it to ever wrap!!! So what's up with the docs? Is it really ever possible for it to wrap? Can the

问题 I'm developing an android application and hit the problem with determining system first boot up time. I mean i need to measure how much time already passed from device first boot up . I know about solution with listening for ACTION_BOOT_COMPLETED and save anything in SharedPreferences, but i need another solution, because this one does not work for some cases. Maybe there is any system property? Use case (excerpt from discussion) The filename of each file I receive from server includes a

问题 We want to run a task every 1000 seconds (say). So we have timer.scheduleAtFixedRate(task, delay, interval); Mostly, this works fine. However, this is an embedded system and the user can change the real time clock. If they set it to a time in the past after we set up the timer, it seems the timer doesn't execute until the original real-time date/time. So if they set it back 3 days, the timer doesn't execute for 3 days :( Is this permissible behaviour, or a defect in the Java library? The