Android :: Timer - Threads - Reliability
Mar 4, 2010
I have an activity that uses a Timer (java.util.Timer) to control the display. I set it off to repeat its run() method every second or so. When it runs, it updates some View elements.
As Timer runs in its own thread, I assumed this would be reliable. But I notice that sometimes there is a stutter, or delay, in the views updating. It's like they occasionally get stacked up, and all happen together. Studying the output from logcat, I notice that this happens when the device is doing something else - some system functions, or sometimes a garbage collection.
How can I avoid this? I'm not aware I can run the main activity in a thread of its own, can I? If the timer has its own thread, why is it affected?
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Oct 27, 2010
I have a simple, classic, statement that every 200 milliseconds plays a sound (a metronome). I wrote it using Handlers, and then in another way, using Threads. The problem is the same in both ways: when I press hardware home button, or also simply when I press a button to open a ListView, the metronome terribly slowdown for a while. This problem (not so strong, but however present) presents also doing nothing and leaving the application in foreground. Any ideas?
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Jul 9, 2010
My app has an issue where many players get bounced all over kingdom come when using GPS to get a signal. I had this issue with my G1 on occasion but not on my Nexus One. I am talking hundreds of miles from their real location. I changed the code to throw out anything that was not at least 500 meters accurate. My question is, if the location placement is hundreds of miles off, how reliable will the accuracy reporting be? Does it realize that it could be hundreds of miles off?
I am asking the community because I cannot reproduce the scenario with what I currently have so I can't test if my fix is meaningful. Does GPS know when its readings are that far off?
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Apr 13, 2010
What are the advantages/disadvantages in placing a lengthy network access code in a thread in an activity or a thread in a service? How would it affect the application? I am writing a streaming audio player and from what I've read so far putting the code in a service will still end up blocking the application so a new thread is needed, does anyone know if it makes more sense to put this piece of code in a service.
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Nov 11, 2010
My phone broke about 1 week ago and it was just a couple of days after my parents asked me what do you want for Christmas, I have never had a smart phone before I had my K800i for 4 years so I never looked at other phones. I quite like the look of the HTC Desire, I did glance at the Galaxy S but the contract prices were too high for my parents so that went out the window pretty sharpish. Is the HTC Desire a goods choice for reliability and usability. I have read many pros and cons but I would like to hear it first hand about any faults with it. Or should I look at another android phone for one reason or another? Like I said I am new to the smart phone world and I have only had a week to look around at the phones. Basically what I want is a phone that rings and I can access the web to check my emails and play with some apps. Sorry if the questions are a bit jumbled its just I couldn't quite figure out what I wanted to ask and part of me is locked onto the desire (don't know why) another part of me says I don't need a smart phone and the other part says "but wouldn't it be nice to check your emails on the go" so I am rather muddled.
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Dec 11, 2009
I'm looking for ways to reduce my phone bill, and ideally I would get rid of my unlimited text plan. Yet, I have heard that SMS messages sent through GV aren't as speedy or reliable as those sent through your carrier. I've read that it often takes up to 5 minutes to receive a text message after one is sent to you. If I'm in the middle of a "texting conversation" I don't want to have to wait 5 minutes to receive a reply to one of my texts.. Is this true? Or does Google Voice SMS work like a charm and I should just drop my $20 a month text plan?
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Aug 31, 2010
I am creating an App in which i need to add a timer for postpone the one event for 1 hr and start same event after 1 hr , so i want to know how i can implement the same. Are there any Timer api's and handling of them in android.
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Aug 15, 2009
I came to know about Timer in android. I read http://android-developers.blogspot.com/2007/11/stitch-in-time.html that Timer is not available at Runtime.
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Jul 22, 2010
I have a service that I need to execute every two minutes. Would it be more efficient to use an alarm or a timer?
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Dec 9, 2009
What is the proper way to set a timer in android in order to kick off a task (a function that I create which does not change the UI)? Or there is a better way in android (android's handler)?
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Dec 3, 2009
How to get whether timer is running or not? That means How to get whether timer is scheduled or not?.
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Nov 3, 2010
I'm looking for the best way to setup a timer for a game. For example I want the timer to tick down, but I want to be able to add to the timer when certain levels are reached etc. I'm just looking for the most efficient way to accomplish this. it only needs to be every second or so. If anyone has any insight on this.
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Feb 22, 2010
I am new to Android development and have been working on a simple demo app that needs to update a TextView a few times from an array after a button is clicked. I have read and adapted the code found here to achieve this: http://developer.android.com /resources /articles /timed-ui-updates.html
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Sep 27, 2010
I would like to know how to intercept the event that the apk has been updated in order to launch again my Timer. Indeed, I have a Timer wich is "scheduled AtFixedRate", but when my App is updated through the market, the timer is killed ; and if the user doesn't launch the App, the timer is not started (so my app becomes useless). How could I do to avoid it ? Is there an event to catch the "App updated" ? I searched, tried, but nothing.
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Sep 27, 2010
I have to give a 20x20 presentation tomorrow and I'm looking for a timer app to help out. 20x20 means that each slide auto-advances after 20 seconds. I'd like to have a timer on my phone that would give me a quick glance of how much time I have left for each slide. Start it at 20 seconds, have it count down and when it hits zero, start over at 20. Seeing as it's just a timer app, I really would rather not pay $2 for StopWatch & Timer, which is the only one I've found that offers a looping timer. Does anyone have any ideas?
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Jan 7, 2010
In order to get XML data from a server repeatedly, I'm attempting to use AsyncTask and Timer as per Mark Murphy's suggestion. I get the following error:01-07 16:11:26.705: ERROR/AndroidRuntime(729): Caused by: java.lang.Runtime Exception: Can't create handler inside thread that has not called Looper.prepare()I'm using SDK 1.5 with Eclipse on Windows.I've looked in documentation, on StackOverflow and in the Android Developers group, but I'm not clear what's causing the error or how to fix it.I can get the data once - i.e. without Async and Timer - and parse it via SAX without problems.s: I'm quite new to Android.
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Apr 22, 2010
When writing :
CODE:.......
Are we actually starting a new thread that handles ticks ? or what is really happening behind ?
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May 31, 2014
Is there a timer within Android that can be set for a given interval and when the interval has elapsed to send a signal back to a listener routine inthe main programme? Something like the way a button reacts when clicked.
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May 4, 2009
I am using a Timer in my android application, but i can't get it to work. When I start my application the Timer simply does not start. The application continues but does not update.The long "toStart" finds the number of seconds left of the current minute, and thereafter the period is set to 60 seconds. The TimerTask simply calls a method.
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Dec 28, 2009
Is there an app that lets you set a countdown timer on another app which causes it to force close. For example, I use my Eris as my MP3 player and would like to listen to it while I go to sleep, however I don't wanna let it play all night while I'm sleeping maybe just an hour or so.*Edit* Nevermind I found an app that does the job. Its called Music Sleep. It lets you set a timer that will close your music app in case anyone else was interested. It only costs 99 cents
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Nov 11, 2009
I am presently working on GPS. I have to start GPS periodically. I mean I want GPS to start after a particular interval, get Location value and then stop taking location updates. For this, I'm calling requestLocationUpdates( , , ) method in a timer. Then in onLocationChanged(), I stop taking location by using removeUpdates(). Then after particular interval, it again starts taking values, then when location changes, it stops, and so on.
Here is my code:
CODE:.............
Now the problem is:It starts fine for the first time,when location changes it stops then starts again,but the timer stops running after that.I dont get any error or exception.I dont know where is the problem.As far as I am concirned,the problem is in timer......
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Jan 23, 2009
I've created an app that functions as a countdown timer via a thread, a wakelock, and a handler back to my activity. My question is, what will cause my thread to die, or app to not be running in memory anymore? I've had this happen once, and can't seem to recreate it again.
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Oct 24, 2010
Interval Training Timer is an invaluable tool for all interested in workout, run, cycling, sprint, tabata, weightlifting, hiit and many more. It allows you to set own training schedule with various number of rounds, ready time, round and rest times and relax time after workout. It is also possible to create dynamic training plans in which every round and rest time can be longer or shorter. Import and Export your training plans or share them with the world!
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Jan 22, 2010
Could someone explain how to use the Timer.schedule - that is used for scheduling tasks - in Python? Note that Python's time.sleep will not work in Android.
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Jan 5, 2010
I need to create a Timer to update the UI at regular intervals. But the Swing Timer class is not available on Android. (I would avoid creating threads and then use the Timer class from java.util package)
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Dec 3, 2009
I'm using a class extends with view. I'm using timer in that class. I'm using onTouchEvent() also. I onTouchEvent() I'm using invalidate(). So it is calling onDraw(). When i use invalidate() in Timer. It is not calling onDraw().
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Oct 4, 2010
I have a class that is essentially a message manager (a singleton) that has a timer that polls for status. (statusPollerTask is just a derived class of TimerTask that has the run() defined)
timer.scheduleAtFixedRate(this.statusPollerTask, 0, 1000);
Several Activities register themselves with the msg-man for updates (observer pattern style) as they become visible. Works fine, except if the user presses the Home button and minimizes the app. Sometimes the timer keeps polling other times it doesn't. I need to maintain the polling even when the app is not visible. I feel like I'm just missing something simple here.
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Jun 28, 2010
i have an android app with several activities. I need to start a timer when the first activity starts and end the timer when the last activity starts and show the elapsed time. How can i use Asynctask to do this.
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Aug 3, 2010
I hv to images say image1 and image2. i want to display both images on timer, like only one image should be visible at a time, both images are overlapped, mean, image1 is over image2..so, if i use timer, i can be able to hide and show one image at a time. How to do this.
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Aug 9, 2010
I need a regular method in my app. The problem is: the following timer in the code do its action just one time. And the timer do it only(the one time) if i do an action( touch the display) after the time(2000) is over. U know what i mean? Maybe it have sth to do with the "OnTouchListener"?
CODE:..............................
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