Develop Reference

How to track system's clock?

Situation:
I need to create a program that shows current date and updates some date(that is NOT CURRENT date,it is past date) according to current time(for example after 23:59,date refreshs). In other words,it is simple application,that shows date in the past and time.
What did I try?
I have found TextClock for this. It can show current time,but I cannot track over it.
So what can I do? I need to create my own clock class or use Timer and TimerTask? Do I need a Service?

I think, if I understand you correctly, you're on the right path. I wasn't familiar that there was even a TextClock view, but it looks pretty basic and will just work for displaying the current time.
Instead, maybe use a TimerTask to update the UI every second, or so, and set one TextView with the current time and another with your other time that's an offset of the current time (current = new Calendar(); current.add(Calendar.MINUTE, 1); )
You could use TimerTask, and that'd be pretty easy compared to rolling your own thread or using an AsyncTask. Get the current time, set it to one text view, manipulate that time variable and set it to the other text view.

update textview from couchdb using changelistener android

I am trying to get real time changes on a document using the changelistener, however i have to refresh tha mobile app to see the change. Here is my gist https://gist.github.com/mikekaraa/89416ea8b074c71d7153
Please help me out if you have a solution

Would you tie your ChangeListener() event to a time interval such that e.g after every 3 or 5 seconds it is fired and triggers the next sequence of events if at all the document changed within that time span.
I hope that helps.

Countdowntimer works in short intervals, but not others

I am facing an interesting situation, maybe someone could explain to me why.
I am doing timer that runs at interval of 100 msec. At every tick, a textview is updated to show the time. Also there is a an edit text with a text watched in which the string is compared 2 times to different strings After each Text changed
When I use Timer class, then the thread seems to be busy because I can't type any text into the edit text . When I use handler same problem happens. But if I use countdowntimer class then it works.
Interestingly, if I increase the interval to 1 sec then all of the above works.
1-is 100 msec too short? I didint think the above computations I making would take that long.
2- why countdowntimer worked and other failed?
Thank you

Android: Timpicker Difference declared in xml and in java code (TimePickerDialog)

So i have this problem of not getting accurate time result from timepicker declared in xml, not the dialog thing, i just wanted to know what is the difference from the two. so that i can know which is better to use on my app, mainly i use the timepicker to set an alarm or a reminder, because i have a hunch that the timpicker declared in xml is just for UI use not really for functionality. because i keep on getting the wrong result, specially dealing with AM and PM, Scenario is that when using timepicker declared in xml (not the dialog), i change first the hour den minutes and lastly the AM and PM, but i won't correctly give me the current time, say i chose 7:30 PM supposedly the value of the hour must be 19 since its 24-hour but instead it gives me 7:30 AM i won't change the AM and PM part thus giving me a wrong result, if you go the other way around, it works, it gives me ang accurate result.
SO my question is what is the MAIN difference between the two timepickers, is it for show(timepicker xml declared) and timepicker(dialog)

Please refer to this post for this problem, i just came across this thread and it is really the same with my problem. its a bug issue in Android
Android TimePicker AM/PM button not invoking onTimeChanged

Seeker For Media Player

I would assume that someone would have found an easy solution to this but I haven't found a straight-forward method. I want to build a seeker bar for playing back audio through the MediaPlayer. I haven't been able to find something like an onSeekChanged listener in the MediaPlayer object so I've built an AsyncTask that just keeps refreshing through a while(playing) loop and updates the duration and bar. This doesn't seem to be the best way, however, since this while loop causes the app to run very slowly (the audio doesn't lag, but buttons like pause are delayed). So I want to know what the best implementation is for building a seeker that is efficient. This isn't a difficult question since so many apps use it, I just want to know what the proper way of doing this should be. Thanks!

First of all you need put sleep at least 1 millisecond in your cycle whit:
Thread.sleep(1);
Second you can calculate needed time for next recheck:
Thread.sleep(1000 - currentPos % 1000);
This algorithm is used in standard MediaController.