Android :: Metronome Timer Slowdown Via Handler / Threads Too
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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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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Sep 13, 2010
Does anybody know of a metronome app that really works well and has similar functionality to this. Tempo (Metronome with Setlist) Music App | Macworld, but of course works on our much better platform.
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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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Mar 26, 2009
I am having a problem with the touch screen in that whenever the screen is touched, it causes significant slowdown because of the large number of callbacks that are being made. I have read in this group about throttling the UI thread, but this does not seem a good solution and i can't believe there isn't a better approach?
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Apr 15, 2014
My main device is an HTC One M8, but I also have a Nexus 7 2013, Nexus 7 2012, Galaxy Nexus, and a Moto X running on the same Wi-Fi network. They are all experiencing some slow activity on Wi-Fi. I also have 2 desktop PCs and a Laptop running on the same network and they are running fine, no noticeable lag.
On all of my Android devices, browsing the web via Chrome is almost as snappy (but still not the speeds I get on data) as it is on my computers. However when it comes to certain apps, there is a noticeable slowdown. Instagram has a lot of trouble loading images, Facebook, Twitter, Play Store downloads are stupid slow as well. And a bunch of push notifications from those apps, as well as GMail, won't come through or will come through hours after they should have.
But if I just switch Wi-Fi off on the devices that also have a data plan running (Moto X, One M8, GNex) everything comes through as fast as expected.
Could it be my router? I have a Linksys E800.
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Apr 18, 2010
I'd really like to know what the state of that fix is as 2.1 is rolled out onto first generation (MSM7200-based) devices. As it stands, I don't see much of a problem with touch eating up CPU on the Droid and N1 but those are much faster phones so I don't think it would be quite as pronounced on them. My current 1.6 devices (G1 and Tattoo) cut my framerates in half during any touch (with the sleep hack, even). I optimized my new games so that they would run well-enough (25-40fps) on that hardware but they have very touch-centric interfaces so won't work well with that bug. I talked to a few people who run 2.0/2.1 mods on their G1s and they said the problem isn't any better. They still see the big slowdown. I tested on my 1.6 emulator vs a 2.1 emulator and there is a huge improvement. The 1.6 emulator slows down just like my G1 does and the 2.1 emulator shows only a tiny bit of slowdown, which is what I was hoping for. That's encouraging, but I have yet to see a real 2.1 MSM7200 update in the field so I don't know what to think yet.
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Nov 18, 2010
It doesn't happen all the time, but it happens 7-10 times a day.Basically I can be using the keyboard or even in an App (like say angry birds) and the screen becomes unresponsive.The speed and responsiveness is comparable to trying to do anything on a 486 PC with a virus scan running.I type a letter and five seconds later it shows up.Interestingly, if I hit the sleep button, and then wake the phone back up it's completely fixed.I'm not saying I'm unique in this, I'm just saying I haven't figured out the correct search terms.I have a HTC Incredible, with the updated 2.2, vanilla.I highly doubt it is an App but here is my list just in case.
advocatus's Apps on the phone
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Aug 12, 2010
I noticed lately that my stock text message application, is going very slow. On entering the application, screen goes black for 5-10 seconds, loads up each contact, picture, name, 20 seconds later, no lag. In this post, a Droid X user actually contacts Motorolla and Verizon about the issue:Text Lag is Back - Droid Forum - Verizon Droid & the Motorola Droid Forum.
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Aug 5, 2010
I recently updated through the OTA update to Froyo 2.2 on a stock EVO 4g (not rooted or messed with at all).When I finished the update,I sent a couple apps to my SD card (like Where was one, forgot the rest, maybe Flikie wallpapers).After that, the SD card was somehow permanently corrupted, I couldn't even format it on the phone or through a card reader on a PC. Anyway, then I started noticing extreme slowdowns on my phone's Sense interface (even today after putting in a new card).For example, when I try to type a text message,I put like a few letters from the person's name and it takes a good 30 seconds to show the results as opposed to instantly.Also, when a call comes in, the number shows up for a few seconds until it recognizes the contact, etc.Could it be because without a working SD card, things were put on the phone and now the phone is full (even though now I have a new card in there)? Or does anyone know why else this could be and maybe offer a solution?
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Nov 30, 2013
I have a Samsung Galaxy Express, which is basically a gimped SIII and ran into some weird slowdown issues. I first noticed with Fast & Furious 6. When I first installed it, it ran smooth. After a few weeks, the game became so choppy it was close to unplayable. I just thought it was a fluke, maybe one of the updates didn't like my phone.
So, after this and other random issues, I did a factory reset. After that I downloaded Injustice, very happy it was finally added for android. Same thing, at first it ran great but after a week or two it started to become choppy. I have cleared all my caches, cleared my ram right before playing by using an app All-in-One Toolbox and I have 2.3 Gigs free space out of 5 Gigs.
The phone runs on Jelly Bean(I think, whatever is 4.1.2) and the model number is SGH-I437. I know there are at least two different Samsung Galaxy Express model numbers so that is why I added that info.
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Aug 12, 2010
I am working on an application wich has its own URI prefix. (dchub:// in this case) is there a way when someone open his browser, clicks on a link starting with dchub:// my app starts using this address? so far found a lot of examples the otherway around opening the browser from your app but thats not what i'm looking for.
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Jul 20, 2010
I've got 2 classes GLLayer and GLCamTest. I'm attempting to run a method located in GLCamTest...
CODE:..........
I'm looking to run in on a thread from GLLayer but from what I understand I need a Handler..
CODE:.........
I'm starting the Thread from within public void onDrawFrame(GL10 gl) { my question is how would I implement said handler? I've read http://developer.android.com/reference/android/os/Handler.html but I still don't really understand how I'd implement it.
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Jun 29, 2010
I am very confused about handlers and looper can anyone plz explain it in simple terms to me any good links would be great.
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Mar 26, 2010
I'm confused as to when one would choose AsyncTask over a Handler. Say I have some code I want to run every n seconds which will update the UI. Why would I choose one over the other?
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Oct 10, 2009
I'd like to know if Looper can enable handler to handle one message at a time, instead of handling all the messages in the queue together in one blocking call when Looper.loop() is called.
Because the looper sends all the messages in the queue to the handler one after the other in one blocking call, my application displays the ANR message. Instead, I want to be able to handle one single message, one blocking call at a time - the instant it falls into the queue.
The following code illustrates my problem: (pls note the lines referred: 1,2,3,4&5) Question 1: After calling looper.loop in line3, line4 and 5 don't run. Why is this? I tried quit(), but it doesn't help. Question 2: Instead of displaying 0,1,2,3,4 in one blocking call (at line3), I'd like to have 5 different blocking calls for each. Essentially (sorry, if i sound repetitive), I want to be able to use looper in such a way that each time, it ensures only one message gets handled.
Is there a way to do this?
CODE:..................
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Aug 9, 2009
I've read the android AIDL documentation and have a general idea of how RPC works between an Activity and a Service. However, for my application it seems overboard to implement such features: basically, I want to pass a Service a nice handler so its thread can pass data to my Activity. Currently I'm getting around this by using a static public member (a hack) but I would prefer just passing a Handler object in the Service's starting Intent. However since a Handler isn't serialize-able , I haven't found a way to pass it to the service without a simple static member hack. Any insight? Or, am I just going to have to suck it up and do a formal RPC to the service?
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Sep 30, 2010
I am using a handler inside my service to display notifications at a certain time using the Handler.postDelayed method. My application runs fine on the emulator just as expected satisfying all cases. But when I installed the same on my HTC Wildfire, it simply doesn't happen as anticipated. Notifications are displayed at a random manner after the scheduled time and some notifications even fail. I'm monitoring my service from the Applications > Running Services and still my service is active.
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Nov 11, 2009
i want to do the following thing - when a user navigates to a web page, I want to have a link in there that looks like this: <p><a href="myprotocol://blah=42">Click here for fun.</a></p> Then when the user clicks on that from the phone browser, I want it to launch my intent with that full url. In my AndroidManifest.xml file, I have the following info: <activity android:name="com.test.MyActivity" style="@style/ MyStyle"> <!-- custom protocol association --><intent-filter><action android:name="android.intent.action.VIEW"></action> <category android:name="android.intent.category.DEFAULT"></category><category android:name="android.intent. category. BROWSABLE"> </category><data android:scheme="myprotocol"/></intent-filter></activity>When I try this, when I click on the link on the web page from the phone browser, it says -- Web page not available The Web page at myprotocol://blah=42 might be temporarily down or it may have moved permanently to a new web address.
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Nov 9, 2010
I'm trying to call a web server that is using relative URL redirects for some of the calls. This of course isn't working with DefaultHttpClient as it isn't treating it as a relative URL. I've gotten as far as implementing a RedirectHandler in an attempt to catch the redirect and add in the base call but I can't work out how to get the location of the redirect.
With the following method how do I go about finding out where I am being redirected to? I can't find any fields on either response or context that have what I need and I don't know where else to look.
public URI getLocationURI(HttpResponse response, HttpContext context)
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Jul 26, 2010
Assume that there activity A and B, A has a handler, now B is activate by A, how can i pass the handler to B? Currently i have a thread receive messages from socket, and dispatch messages to A and B, I think when B is activated, pass handler to B, then the handler can receive message from the thread. But I don't know how to do.
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Oct 30, 2010
I need to update my ui for an android app and I'm trying to use the Handler class to do it, using http://developer.android.com/resources/articles/timed-ui-updates.html and the android developer resources "Common Task" for using Handlers as guides.
Basically, I need something between the two - a timed update of the user interface, but without a button. So here is the relevent code that I am working on.
CODE:...............
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May 12, 2010
I will try to keep it simple:
In my main activity I make a handler:
CODE:.......
CODE:......
But if I call the handleMessage method from a callback function in a other Class, definitely from a other thread, I still get the exception message: CalledFromWrongThreadException (Only the original thread that created a view hierarchy can touch its views) :
CODE:...................
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Jul 1, 2009
I created a full-screen application and set the default orientation to landscape. When I open the keyboard the application crashes therefore I would like to override the method which executes on keyboard slide. Does anyone know which method is that?
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Jun 9, 2010
I need to download an image from the internet,in a different thread,and then send that image object in the handler message, to the UI thread.And by the way, is this the most efficient way to pass an object to the UI Thread?
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Oct 13, 2010
In Handler, we can pass some data from a background thread to the UI thread like this:
private void someBackgroundThreadOperation() {
final String data = "hello";
handler.post(new Runnable() {
public void run() {
Log.d(TAG, "Message from bg thread: " + data);
}
}
}
If we use the above, we cannot then use Handler.removeCallbacks(Runnable r), because we won't have references to any of the anonymous runnables we created above. We could create a single Runnable instance, and post that to the handler, but it won't allow us to pass any data through:.............
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Nov 20, 2010
I made a simple countdown timer and it works as expected when plugged in via usb for debugging but when I take it off debugging and the screen goes off either time out or power button the handler fails to fire at the end time. I have created a custom timer class that gets created from the main activity when needed, because its able to have multiple countdowns running at the same time. Am I right in thinking that the handler just gets paused when the screen goes off and if so what are my alternatives. The activity is still in the foreground and I assumed the handler would still fire if the screen goes off.
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Feb 2, 2010
My program threw a NullPointerException the other day when it tried to use a Handler created on another thread to send that thread a message. The Handler created by the other thread was not yet created, or not yet visible to the calling thread, despite the calling thread having already called start on the other thread. This only happens very rarely. Almost every test run does not get the exception. I was wondering what the best way is to avoid this problem for sure with minimal complication and performance penalty. The program is a game and very performance sensitive, especially once it is running. Therefore I try to avoid using synchronization after setup, for example, and would prefer to avoid spinning on a variable at any time.
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Apr 15, 2010
The first time issue it i give null as parameter to the function to the selection parameter is empty, meaning i don't filter any rows. The problem is i get only contacts i created myself using no syncAdapter. I used facebook app to synch my facebook contacts, but this query doesn't return them. I extracted the contacts.db from the emulator and the view_contacts view shows me all the contacts, so the DB is updated. What should i do to get all the contacts regardless of how they were created (with which synch adapter)
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Jul 9, 2009
I wish to analyze the various data passing through the browser. I would need a handler of the browser to query the contents. Is there any way that my application can get this handler of the browser and query for these data.
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