Android :: How To Handle Activity Lifecycle On Wake Up - Alarm App

Oct 4, 2010

I'm having a couple of problems with an alarm app I am developing.

The first thing that I think is a bit weird is that when an alarm goes of and wakes the phone up. These things happend.


Why are they run in that order? The last two should not be called? And this is what's causes me big trouble, because when i press home or back on the phone, onPause is run, which I want to call finish() from. And that part works as it should, but that does not work when the phone wakes upp from sleep bacause of the onPause call...

Android :: How to handle activity lifecycle on wake up - alarm app

Android :: How To Handle Alarm Clock & Alarm Reciever Broad Casting To Pause Playing Mediaplayer

Jun 22, 2010

I am using service class to play the mp3 file using media player object on Android platform, problem is, i am not able to handle the alarm interruption.When any previous set alarm clock reach to it's alarm time it starts to play in parallel with mp3.I want that mp3 should become paused and after alarm it again start to play,same thing should happen with snooze.

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HTC Droid Eris :: Alarm App - Wake Up Alarm

Mar 2, 2010

I upgrade from a blackberry storm to the eris and I'm looking for an alarm app that could turn the phone on when its time to get up. My blackberry had the capability of being turned off but would turn back on when the alarm went off. Does the eris have this capability or is there an app out there for this.

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Android :: Activity Lifecycle OnStart OnStop Possible?

Oct 5, 2010

In the Android Application Fundamentals it says that after the call to the onStart()-method of the activity lifecycle either the callback method Resume() or onStop() is called. In case of an "normal" Start of an activity the system calls onCreate(), onStart(), onResume().But does somebody know an example where onStart() - onStop() are executed one after another?

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Android :: Activity Lifecycle And Static Variables

Jul 14, 2009

I just ran into a situation where it looks like a static variable reference is persisted across activity sessions. I didn't expect that because I thought that when an activity exits, it's de-referenced and garbage collected. I am wondering if anyone can shed some (more) light on when the VM eliminates object references for Activities and Services and in particular when static variables get reset to default values?

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Android : Activity Lifecycle Cause Memory Leaking

Aug 7, 2009

The Activity Lifecycle could have implementation and or design bug: One case is to initialize a big image in onCreate(), try to reuse the image during the whole lifecycle, and then recycle the image in onDestroy(). Test showed that onCreate() is called every time one navigate away from the activity and back again, but onDestroy() is not called at all. This behavour causes memory leaking for the big image (size 960*1920). After 6+ times away and back to activity, the system runs out of memory and has to kill the process.

One workaround is to initialize the big image in onResume() and recycle in onPause(), but that's not so good reuse.

Could it be better to change the process (as shown in the diagram) a little bit such as: Call onDestroy() first when a process is killed?

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Android :: Activity Lifecycle On Nexus One - OnStop Not Called

Mar 4, 2010

I have a problem with the activity lifecycle specifically on Nexus One (2.1 running on emulator works fine). If I just create a simple empty Activity with no special launchModes that logs the calls on the onStart and onStop methods, this is what I see: - launch app: onStart called; - home button: onStop NOT called; - launch app: onStart NOT called; - home button: onStop NOT called: and so on. Sometimes if I press the back button then the onStop is not called, but the when i launch the activity again the onStart is called and right after the onStop is called. Similar results with different launchModes. What is going on? Can anyone confirm this?
i found an android issue for the problem here: and a similar thread here

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Android :: Rule That Relates OnMeasure To The Activity Lifecycle

Jul 12, 2010

I have a custom view on which I need to call a method from my activity after the view has been measured in onMeasure. I would like to know exactly when onMeasure is called in the View layout process. It looks like onMeasure is called after my activity´s onCreate, onStart, and onResume. I could override onMeasure and maintain a variable that contains whether the view has been measured or not. However it would be nice to know if there is a rule that relates onMeasure to the activity lifecycle?

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Android :: Using Activity Lifecycle Methods / What's Best Strategy For Binding?

Sep 15, 2010

I'm binding to a local Service (that is, not using IPC and AIDL) from several activities. I want to ensure that I'm not holding references to this service from activities that the user isn't using. My options are: 1.) to bind to the service in onCreate() and unbind in onDestroy(). 2.) bind in onStart() and unbind in onStop(). 3.) bind in onResume() and unbind in `onPause(). Or some combination of these. Which is the best-practice way of binding and unbinding to a local service? Do I not need to be concerned with holding local connections from stopped activities? Additionally, once bound to this particular service I am retrieving a Cursor which is attached to my ListActivity via a CursorAdapter. The data retrieved by the Cursor may have changed while the Activity was out of view so I want to requery it when the Activity is shown again. If I bind in onCreate() I can requery in onRestart(). If I bind in onResume() each time the data will be fresh because I'll query it in the Service's connected callback.

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Android :: Get Information Of Activity Lifecycle Callbacks In Views Drawn?

Aug 3, 2010

I want to get the size of a view that is in my activity but I am not able to get that information in any of the activity lifecycle callbacks (onCreate, onStart, onResume). I'm assuming this is because the views have not been drawn yet. At what point are views drawn and is there a callback I can put my code so I can get the size of the view?

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Android :: Alarm Clock / Not Wake Up The Phone

Oct 14, 2010

I am using the factory Alarm Clock on my Inc. It works okay but if my phone is off, the alarm will not wake up the phone and sound alarm or at least the alarm going off would work for me.

On my BB Curve even if the phone was off the alarm would go off at the set time and the phone would turn on. Kinda nice, only downfall is only had 1 alarm where as Inc has a few.

With the marginal battery life on this thing I sometimes turn it off to charge when going to sleep at nite and do a few bumps in the morning. Problem is the alarm doesnt go off if the phone is off.

IF the factory phone alarm does not do this does anyone know of one that does? Perhaps in Market?

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Android :: Alarm Wake Lock And Services

Dec 18, 2009

I have a question about alarms used with services with regards to wake locks. The documentation explains the behavior using BroadcastReceivers, a wakelock is held during onReceive(), but doesn't describe the behavior for alarms starting services with the RTC_WAKEUP flag. What is the behavior in this case?

I have an app implementing this, an alarm is created with the RTC_WAKEUP flag that starts a service. The service onCreate() then starts a thread to do some network activity. It seems to work just fine but I just want to make sure that I don't need to explicity hold a wakelock myself.

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Android :: Activity / Process Lifecycle - Save / Load Data To / From Disk

Nov 26, 2009

My app is made of two activities, A and B. I'm considering this sequence of steps: Activity A is started. A launches B [A is paused, B is running]. B launches a map intent [A and B are both paused now]. Now the user is using the maps application and the system decides it needs more memory. Can the system kill only one of my activities for memory, or will it always kill all activities in a "process" in this situation?

Both activities share some static data like:

class Data {
public static String mName;
public void save() {
// write to file: mName;...................

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Android :: How To Handle An Alarm Triggered Each Day

Jan 21, 2010

I want to set an alarm in my application which will be triggered each day. According to the doc, I have to set a one-time alarm, and in the BroadcastReceiver which will receive the alarm signal, reset the alarm for the day after. Is that correct ?

My BroadcastReceiver handles well the wakelock and launch a service which releases this wakelock. Everything works fine here.

However I have problems. In my application there is a checkbox which is checked when alarm is up. To know if my alarm is up, I use the following condition :


But this doesn't seem to work very well, is that a good way to know if an alarm is up ?

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Android :: How To Handle Alarm Notification

Apr 26, 2010

I'm developing an media player application for Android, for which I need to handle any Alarm notification, and based on that I'll pause my playback. When the Alarm in snoozed or dismissed, I'll then resume the playback.

I googled a lot for the Alarm handling, but what I found was the way to enable Alarm notifications through code, set the intent and then handle it. However, no where could I locate just handling the Alarm notification part. I don't need to set the Alarm on, it could've been set by the user, and I don't need to programmatically. All I need is just handle that notification.

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View Lifecycle And Refresh When Returning From Activity?

Oct 26, 2012

I'm writing an application for Android and have multiple Activities, there are three to be exact. When a user drills down to the record they would like to view, they can modify it.

The issues is that when I click the back button to move to the previous screen, i'd like to refresh it to reflect the update performed by the end user. I can't figure out how to hook onto the appropriate event and then refresh my data on that view.

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Android :: Handle Screen Orientation Changes With An Activity Started Within A Tab's Activity

Nov 2, 2010

I have a TabActivity, and each Tab corresponds to its own Activity. In one of them, in the onCreate method, I use startActivityForResult to show a dialog (specifically, Bump's BumpAPI activity).


The problem is that when the screen orientation changes, it tries to create the tab's activity again which makes another BumpAPI dialog, resulting in multiple stacked on top of each other. Do I have a hook into the started activity to cancel the previous one when the orientation changes?

A workaround seems to be to add a button that when clicked, starts the second activity, but that adds an unnecessary step.

Also, I can't fix the screen orientation for the entire tabActivity because some of them require typing and users may want to use their physical keyboards.

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Motorola Droid :: Alarm Wake To A Playlist?

Nov 11, 2009

Anyone have any ideas how to get the alarm to wake to a playlist? Would be nice to wake to music rather then some nasty noise. And since the thing is loaded with my songs would be nice for it to just pick one of my songs randomly.

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Samsung I7500 :: Low Battery Alarm / Handle It

Feb 7, 2010

How do you handle the issue? it should be part of the os...

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HTC Droid Eris :: Option To Turn Off Phone - 'wake Up' Right Before Alarm Goes Off?

Mar 3, 2010

I know I'm comparing phones that are different, but the Blackberry has the option to turn off the phone, and 'wake up' right before the alarm goes off. This helps save battery life and keep from waking you up in case you get an email or text in the middle of the night. Is there any way the Eris has something comparable? I know there is an airplane mode - what is this? Any chance that's what I'm looking for?

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Android :: Detailed Android Activity Lifecycle - OnAttachedToWindow()

Jun 14, 2010

I'm interested in android activity lifecycle and I would like to get more detailed description/documentation/reference than widely available basic (onCreate->onStart->onResume) one.

My need comes from realizing that starting new activity (Theme.Dialog styled) from onAttachedToWindow() greatly improves response time if comparing to starting it from onCreate(). I wonder how this onAttachedToWindow() fits into whole android activity lifecycle. Official API ref description "Called when the window has been attached to the window manager" doesn't help a lot.

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HTC Incredible :: Hydra Kernel - Phone Freeze When Wake Up To Play Notification Sound Or Alarm

Aug 17, 2010

last night I got tired of waiting for the 2.2 update so I installed unrevoked forever, 2.15 radio and the third wave rom from adrenyline. After all that went smoothly I decided to throw the standard clock undervolt hydra kernel in there too. After I did that I got sporadic reboots and the screen became very unresponsive. Also it seems to cause the phone to freeze whenever it has to wake up to play a notification sound or alarm...

Now I have to say that I had the same problem about a month ago when I tried one of the older Hydra Kernels, but I figured it would be fixed with the newer ones. My question is it seems that I am the only one with problems, all the posts I read about these things are positive with little or no issues. Am I installing it incorrectly somehow? Is anyone else having issues too?

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Android :: Handle Existing Instance Root Activity Launching Root Activity From Intent Filter

Apr 3, 2010

I'm having difficulties handling multiple instances of my root (main) activity for my application. My app in question has an intent filter in place to launch my application when opening an email attatchment from the "Email" app. My problem is if I launch my application first through the the android applications screen and then launch my application via opening the Email attachment it creates two instances of my root activity. steps: Launch root activity A, press home Open email attachment, intent filter triggers launches root activity A Is it possible when opening the Email attachment that when the OS tries to launch my application it detects there is already an instance of it running and use that or remove/clear that instance?

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Android :: How To Handle Activity When Orientation Changes?

Aug 9, 2010

I am writing an activity, that loads data from a server and displays it as a list using ArrayAdapter. For that I'm showing a progress dialog i.e loading, while it loads all data from the server. Then i dismiss the dialog in a handler. My problem is that when ever i change the orientation, the progress dialog is again shown, which is not needed, because all the data is displayed already?

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Android :: How To Handle Home Key In Our Activity

Sep 8, 2010

How to handle Home key....Plzz Help me out.We can handle Home button.if you have seen the Nexus One device...when u reset the phone ..and switch it on again some tutorials kind of thng that time wen u press the home button its not taking u to the Launche Activity...if its not possible then how they are handling over there.I want the Answer..No one in this Blog has any idea how to handle it....or no one has tried on this..sum are sayng that we can handle it by class,some r sayng we can handle it by Using onNewINtent() method.But the Question is how we can handle it by these two ways...Just provide me the sample code..where we are handling the HomeKey.

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Android :: How To Handle Notifications In An Activity

Sep 13, 2010

I have an Activity that will query a RESTful API every x seconds (polls using a handler). The results of the GET are used to update a ListView. This is done using an AsyncTask.

I want to put a Notification in the Notification bar when certain criteria are met in the new data. Everything I have read up to this point has suggested that notifications should be created and updated using a service so that the notifications can be made even when the application isn't in focus. I see the positive aspects of this.

However, I'm unsure if I should just create a service from within my activity or if I need to do something more complex than that. I'm undecided on if I should scrap my AsyncTask model in favor of using the Service to update my list view.

So, my questions are:

1) Is there a good tutorial showing how to make a local service from an activity?

The tutorial doesn't need to show how to make them communicate, the service could be isolated from the main activity.

2) Will #1 provide me with the notification benefits I'm looking for? (Notifications are generated even when the main app isn't visible)

3) Should I use this same service to update my listview?

The service would basically be making the same query that the AsyncTasks are, just doing different things with the results. The app would seem to make more sense to have the Service query, do notification processing, then give the results to the activity, but I haven't found a good resource that clearly demonstrates how to do something like this.

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Android :: Activity Found To Handle Intent?

Aug 4, 2010

I am tring to invote internal media player of android from my activity. Seems there is some problem in menifest file .

Please look into this issue .


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Android :: Activity Not Found To Handle Intent?

Nov 24, 2010

I have a problem regarding my intent. It seems that my app crashes when i select the intent. I found the line of error code due to the stack trace. But i couldn't find anything wrong with it. Hope anyone can help me with this.

This is the java code in line 121:


This is the stack trace:


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Android :: ActivityNotFoundException: No Activity Found To Handle Intent

Nov 2, 2010

test.class type is right? How to? What should I do?


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Android :: Handle Background Threads When Leaving An Activity?

Oct 10, 2010

I need my Android app to save it's state to disk when its activity is put in the background or killed. It's been suggested that I start a thread when onPause() is called and perform any expensive I/O procedures there (see

In what situations will the OS kill the thread and how commonly do these situations occur?

I assume it will be like how Activities are dealt with where the OS can arbitrary decide to kill the thread but will mostly only do this when resources are extremely limited. It would be nice to find some specific documentation of this though.

From playing around, with some test code, a background thread started in onPause() will run indefinitely in the background on my device (I tried loading lots of apps and couldn't get it to be killed).

For my specific app, I'm writing a bitmap editor where I'm using the Command pattern and the Memento pattern to allow undo and redo of edits. I'd like the user to be able to undo/redo their edits even e.g. the user gets a phone call and the activity is killed when it is put in the background. The best solution I can think of is to use a background thread to constantly save my command and memento objects to disk during application use and to finish up saving any objects that are left in a background thread if onPause is called. In the worse case, if the thread is killed I'll only lose some edits.

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