Android :: Not Using A WakeLock - Why Does The Device Stay Awake

Apr 13, 2010

I have a service which, when started, does some stuff (like downloading files) typically taking about 2-3 minutes.

If I start this service and then immediately use the power button to switch off the screen, then I would expect the phone, at some point, to fall asleep. But it never seems to fall asleep while the service is still doing its stuff. At least, not on my Nexus One.

I'm not using a wake lock (though I do use WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON in the activity that monitors the service progress).

So is it true that I don't need to use a wake lock?

Android :: Not using a WakeLock - why does the device stay awake

Android :: 1.5 - Phone No Longer Stays Awake When - Stay Awake - Is Enabled Under Development Settings

May 28, 2009

Has anyone else noticed this? It's slightly annoying. I downloaded my version of 1.5 from

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Android :: Way To Force An Android Device To Stay Awake

Sep 7, 2010

This app needs the device (and its display) to stay awake between onPreExecute() and onPostExecute().

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Samsung Fascinate :: Stay Awake Mode

Oct 25, 2010

Are there any adverse affects of using Stay Awake mode for extended periods of time? Will the AMOLED display burnout at some point?

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HTC Legend :: Why Wont Stay Fully Awake

Sep 13, 2010

I'd like my phone (HTC Legend on 2.1) to stay at full brightness whilst it's charging (with "Stay Awake" checked) but after a minute or two it always dims to about half power. Is it possible to set it to stay on full brightness permanently?

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Android :: Possible To Wake The Device With - PowerManager.WakeLock.acquire

Jun 16, 2010

I have a timer that schedule a task to run every 5 minutes. This task send a request to a server, so I need to be sure that CPU is on so that wifi or 3g can be used.

So the first thing I do in my run() method is :


And the last thing I do in the run() is : wl.release() ;

I would like not to release here to be sure my service will run in the next 5 minutes :

The question is : if the device is already in a sleep state, can I wake up it with my wl.acquire() ?

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Android :: Timeout On Wakelock Causes WakeLock Under-locked Error

Jul 7, 2010

I have a service that acts a download manager, downloading files in the background. I have aquired a partial wake lock while the downloads are going. When the downloads finish, I manually release the wakelock. Because I am paranoid, I acquired the wakelock also with a timeout. The problem I am seeing is that if I have already manually released my wakelock, when the timeout period expires an error is presented to the user (and adb logcat shows an under-locked wakelock exception).

Is there any way to use a timeout (as backup wakelock release in case the app force closes for some reason) without getting this error?

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PowerManager And WakeLock - Device Does Not Turn Screen On?

Sep 10, 2010

I'm developing an sms receiver, and i have included a KeyguardManager and a PowerManager to be able to disable the keyguard and turn on the screen if user would like to. This works great, but only once.

When a message is received, the keyguard gets unlocked and the screen is turned on, and it gives out a sound and vibration. But if i don't read the message right away, but let the device power off by screen time out, and i then receive another message while the last one is not read, the device does not turn the screen on again, and it does not give out a sound or vibration, until i turn on the screen manually, then the sound and vibration comes.

If i close all received messages, then my app is able to disable the keyguard and turn on the screen and give out a sound and vibration when a new message is received.Here is my code that is run when the keyguard should be unlocked and the screen should be turned on.

private void disableKeyGuard()
KeyguardManager km = (KeyguardManager)getSystemService(KEYGUARD_SERVICE);
kl = km.newKeyguardLock("SMSHandler");[code].....

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Android :: How To Make Service Run / When Device Is Not Awake?

May 21, 2010

my application objective is to save location updates every ,let say, 20 minuets .I used service and it worked fine , but when i lock the screen or it is locked automatically the service stop running .when i unlock it , service runs again.How to make my code run all the time in all conditions?

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Android :: Way To Keep MicroSD Card Interface Awake While The Rest Of The Device Is Asleep

Nov 10, 2010

I am working with custom microSD cards. I'd like to be able to maintain power to the microSD card while the handset sleeps.

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General :: Which Android Device To Stay In A Car For Radio Streaming

Jul 15, 2012

I'd like to install an Android device (tablet, smartphone, computer or whatever) into my car.

The purpose is to listen to internet radios and to be able to switch between those radios using my toyota car player which handles bluetooth/A2DP/avrcp .The app I would use is xiialive. This device would have his own sim card and should stay in the car. I don't want to plug the device each time I enter in my car, push any button or whatever. I would just like that the fact to put the key in my car would connect automatically to a webradio.

In fact I don't really need to see the screen, the device could stay hidden somewhere inside the car.Here are the features I would like :

- auto boot when I turn on the car, which means when the device receives power from the usb port (my car has an usb port)
- plug an external antenna to get a better reception while driving. I'm thinking of a small android computer with a 3G stick plugged in. I have a 3G stick with an external antenna slot. Or any smartphone with an external antenna slot, but I haven't found one so far.
- eventually auto power down when I turn off the car, but If the device shutdowns when the battery is empty, it could be ok too

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General :: Device Navigation Softkeys Stay Lit During Stock Browser HTML5 Video Playback

May 30, 2014

I'm using the Note2 with the TW-based Digiblur rom and am having trouble when playing HTML5 player videos in the stock web browser. Any time a video plays, instead of timing out like they are supposed to, the navigation softkeys on the device stay lit while the video is playing. If I pause or stop the video, everything goes back to normal and the keys time out like they are supposed to. The problem is not present in any video player application, including the stock YouTube client.

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Android :: WakeLock

Sep 1, 2010

I have a problem with acquiring a WakeLock. It seems not to work. I am trying to acquire a FULL_WAKE_LOCK but neither the display gets enabled nor is my app able to perform tasks.

I am using the following permission: android.permission.WAKE_LOCK

My acquire code looks like this:


What am i doing wrong?

Added another flag ACQUIRE_CAUSES_WAKEUP ... but no changes in behavior

All i am trying to do is, to play music and to wake my device up upon a certain event. The music is working perfectrly but the device stays black.

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Android :: IntentService And WakeLock

May 24, 2009

The new IntentService in Android 1.5 looks excellent for handling AlarmManager-initiated broadcasts for scheduled WAKEUP work...except I can't see that it uses a WakeLock anywhere, either in itself or Looper/MessageQueue.

Does this implicitly hold a WakeLock that I'm not seeing? Or would I need to create a WakingIntentService that has an active WakeLock so long as there are messages in the queue?

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Android :: How To Get WakeLock To Work

Jan 11, 2010

My WakeLock isn't keeping my device awake.

In OnCreate() I've got:




The screen turns off before the timer finishes, how can I make the screen stay visible?

mWakeLock is a field previously declared like so: private PowerManager.WakeLock mWakeLock;

My device uses Android 1.6. I would really appreciate any help to resolve this.

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Android :: WakeLock And KeyGuard

Jun 7, 2010

I'm just wondering if I do this correctly; I'm programming a notification app which can display a notification when the phone is sleeping

Disable keyguard lock. Aquire a wake lock. show notification. Set alarm for timeout and reenabling keyguard and release wakelock is the user dont touches the screen. 4.1 User touches the screen, and I disable the timer. Do nothing more. Done and done 4.2 User dont touch the screen, so reenable keyguard and release wakelock. Phone sleeps again

Basically I'm wondering about point 4.1 the most. cancel the pendingintent for the alarm, and do nothing more? or should the keyguard and wakelock that are set be dealt with in some way?

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Android :: Using A Wakelock In A Service 1.5

Jun 14, 2009

I am trying to use a service to control a wakelock so I can permanently leave the screen on when my application is running. I create the wakelock and activate it in onCreate() and release it in onDestroy() however I get the error "wl cannot be resolved".

Can someone explain how I can get over this? Code below:


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Android :: Wakelock Is Not Turning On Screen?

Sep 11, 2010

I have a signal that puts my app to sleep for a given number of minutes (using AlarmManager) and then wakes it back up.Everything is working except the screen doesn't ever come on.I then release the wakelock when I'm sure that my app is up and running and connected again. However, the screen never comes on! The app only actually comes back to life when I hit the power button to wake up the screen manually.I'm developing on an HTC Hero.

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Android :: Network Connectivity Checking Without Wakelock

Mar 26, 2010

I have a terrible bug in my widget. The widget is waken up using an AlarmManager (the update interval is chosen by users, ranging from 30 mins to 2 hours) to grab some data from the Internet and display it on the widget. I do not hold a wakelock since if the phone sleeps, just let it sleeps. There's no way to update the information since nobody will see it. If I put the phone in the basement (has no wi-fi or cell signal) for about an hour. the phone will definitely not update anything. However, when I get it back from the basement, the cell network could never be recovered again no matter how long I have waited (it just get an X on the cell signal icon on the notification bar) that I must restart the phone. May I know if a partial wake lock must be held on checking network availability?

Find the code skeleton as below:


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Android :: Activity Launch Timeout Even With Wakelock

Oct 20, 2009

I have the following code in Oncreate of my activity:


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Android :: Internal Data Storage And WakeLock

Oct 18, 2010

I have a service that needs to write some data to the internal storage using RandomAccessFile. Do I need to use a WakeLock to make sure the data won't get corrupted if the service process gets killed?

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Android : Preventing WakeLock Under-Locked Exception

Feb 4, 2010

I'm trying to implement a times WakeLock in my Application, so this is not a Service.

I want the wakelock to simply prevent screen dimming for 3 min. Looking through the docs, this seems simple enough, but I seem to randomly encounter a Under-Locked exception that I cannot pinpoint.

Here is my WakeLock-related code:

in onCreate: PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); mWakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, TAG); // Adjust time to include user's setting int timeout = WAKELOCK_TIME - Settings.System.getInt(getContentResolver(), SCREEN_OFF_TIMEOUT, 0); if (timeout > 0) {mWakeLock.acquire(timeout);} ...

in onDestroy: if (mWakeLock != null && mWakeLock.isHeld() == true) { try { As you can see, I wrap the release and try to only execute it when necessary as a clean up only. I'm assuming that since I'm aquiring with a timeout, the PowerManager will handle the release in most cases when the timeout expires.

I don't have a copy of the logcat at the moment, but what seems to happen is I get the Under-Locked exception randomly, and at random times (it's not always when WAKELOCK_TIME elapses). The strange thing is that the exception does not point to my code - all the entries point to "internal" Android code.

It's hard to find examples of other people using aquire with timeouts. Any ideas what I could be doing wrong here?

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HTC EVO 4G :: Partial Wakelock

Oct 6, 2010

Is it possible for a program to effectively and efficiently use partial wakelock without burning through a lot of battery? Tango, for example? I'm trying to decide if the partial wakelock usage is worth the video call ability.

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General :: AudioMix Wakelock On Stock KitKat?

Dec 6, 2013

I have a N7 2013 on stock KRT16S, and my biggest wake lock is AudioMix.

I'm rooted, using Greenify, and I even have Google Search uninstalled. I am not using GEL. People suggested turning touch sounds off, and I tried that too, but it didn't work.

what is this AudioMix wakelock? Is this like Audio_Out2 on the Nexus 4? Keyboard sounds or any sounds = wakelock? I also find it odd that considering I use my phone on vibrate 98% of the time, that the on my Nexus 4 and older phones, the speaker turns on when I press any button my phone. I thought system sounds wouldn't turn on? Quite interesting. Even in silent mode, the speaker turns on. I know this because my Nexus 4 speaker used to crack everytime it would turn on. To me that's an unnecessary wakelock that should ONLY happen if you're not in silent or vibrate."

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General :: Generate Wakelock When Screen Goes Off Then Release 20 Minutes Later

Dec 4, 2013

I want to generate a wakelock when my screen goes off and then release that wakelock 20 minutes later. I can't find an app that will do this for me. Is it possible with Tasker and if so, how??

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General :: Google+ Killing Battery With Partial Wakelock?

May 6, 2014

Google+ is killing my battery with this partial wakelock. Short of freezing it with Titanium (which does solve the problem for me), how to prevent this from running? It literally runs as long as my phone is on, and is just draining my battery.

On HTC Sensation, S-Off, rooted, using stock ROM (4.0.3)

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General :: Find Exact Process / Service That Is Triggering Wakelock?

Mar 20, 2013

I'm getting beat down with GTALK_ASYNC_CONN wakelocks while on my work's AP.... the specific WL is :gtalk_async_conn something everyone has been complaining about recently, and I never saw it until recently (now that I got up to 4.1.2 a short time ago.

Is there a way to determine exactly who is generating that WL? It's not related to GTALK, as the WL name incorrectly leads us to believe, but it must be google, and I only see it fire when the Wi-Fi is connected and in use. It's non-existent when I'm on Mobile. It comes and goes, sometimes chugging wake time like its cheap beer, othertimes it's dormant, and I haven't been able to figure out who is using it based on the context of when it occurs.

There HAS to be a log or something somewhere that says process X is responsible.

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Sprint HTC Hero :: To Stay Root Or Not To Stay Root

May 19, 2010

so im running fresh 2.1 and i LOVE IT. i see official 2.1 came out. should i unroot and get the official update or just stay with fresh ?

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Android :: Android - Wakelock & Handling Orientation Change

Jan 13, 2010

I'm using Wakelock in my application to prevent the phone from sleeping when the app is visible. The problem comes when there is an orientation change and the system destroys and re-creates the app in landscape mode. If the wakelock timer has expired in the background the system takes the release of wakelock as an opportunity to switch off the screen.

Edit: I should mention that I am setting Wakelock onResume, and releasing onPause - as I understand it, it's necessary to release then to prevent the app from leaking the wakelock. I need wakelock to continue through the orientation change. Below I've outlined a solution to this. Is this the preferred way to handle it, and are there any alternatives?

Create a service which holds wakelock (rather than the activity) and when the activity unbinds the service starts a countdown timer (for say 10 seconds) in which it will release wakelock when the timer expires if the activity does not rebind. If it was a simple orientation change the activity will rebind within that 10 seconds and so maintain wakelock, if it doesn't, wakelock will be released.

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Android :: IM App That Doesn't Keep The Phone Awake

Aug 18, 2010

I'm looking for an IM app that I can run in the background that wont keep my phone awake and draining the battery. Hi AIM and Hi Yahoo both keep my phone awake continuously.

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