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:
CODE:.................
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Oct 6, 2010
I have an IntentService which makes some web service calls. Before making these calls I check to make sure the device has network connectivity.
I am doing so like this:
CODE:.............
Unfortunately, when I'm debugging on my Android device, this returns false when I have both a network and a wireless connection.
Some interesting tidbits about connec.getNetworkInfo(0):
CODE:...................
Clearly this code is not sufficient (perhaps it would only return true if I sent some bit over the network and turned the radio on?). Moreover, since I'm not well versed in the ConnectivityManager, I'm assuming I should probably be scanning all networks (ie: getNetworkInfo(0 through N)).
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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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Oct 30, 2010
My app doesn't connect through HTC EV0-4G. How app can access network through CDMA 4G.
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Nov 17, 2010
I have a simple java code which gets html text from the input url:
code:................
I am using this code in an android project. Now the problem comes when there is no internet connectivity. The application just halts and later gives error. Is there some way to break this after some fixed timeout, or even return some specific string after an exception is thrown.
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Mar 24, 2010
I have a Service/AlarmManager set to go off ever hour; as seen at: http://github.com/commonsguy/cw-advandroid/tree/master/SystemServices...
The Alarm triggers a Socket connection to communicate with a Web Server. I'm logging the interaction to a file so I can see it later. When I leave the phone on my desk for a day, it seems that more often than not I get a "Network unreachable" error when trying to do any networking.
I believe it is related to how deeply the phone goes into sleep. Is there a special kind of lock I have to hold, or some command required to prep the wireless radio so that it can be ready to access the Internet?
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Apr 29, 2010
So I dropped AT&T for the Incredible and my number successfully ported over, but I cannot connect to the Internet.I can make/receive calls and SMS, but no Internet besides wifi.I've been on with vzw support and went through reactivating the phone (*228) and a couple hard reset to no avail.They said it could have something to do with porting from AT&T, but I'm not understanding that connection.I don't have too much faith in support figuring out so I'm trying this forum. Does anyone have a clue how to resolve this or is it a defect with the phone.Some details: there is no 3G symbol near the signal status bars.Settings/Wireless & networks: shows "Mobile Network" with a green check, buts its grayed out so no action can be taken on it.Directly underneath "Mobile Network" it says "Turning on..." and it seems to flash that status every once in a while.
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Feb 12, 2010
I would like to implement a functionality in my game to give some daily goodies. But user can easily abuse it by changing the date of the device again and again. I know this can be easily implemented through some server. Is there any way to handle it locally without the involvement of server or network connectivity?
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Nov 14, 2010
My Epic 4G just lost all connection to the internet about an hour ago. Out of the blue, so to speak. I was browsing, set it down, then when I used it again it wouldn't connect. My browser, facebook, and any other connection required apps throw error messages saying - "connection error", "no connection". I've reset the phone several times, and as far as for the network settings, everything looks set the way it always is. I have done nothing to the network settings/options to have accidentally messed it up myself. I am connected via 3G, and this network problem is new to me. This phone has been nothing but constant problems and this is the newest one in a long list.
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Aug 11, 2010
I bought my Xperia x10 mini yesterday, and one of the first things I did was to set it up for WiFi in my house (which I already have 2 laptops and a stationary PC connected to). Setting it up was easy and quick, but my phone doesn't find the network, not even if I am standing right beside the router. I have tried to restart the WiFi connection, restart my phone, delete and re-add the home connection, but the phone still doesn't connect to the network.
The network's SSID isn't broadcasted for security reasons, could this be the problem? When I search for networks, it doesn't find any 'unnamed' networks like the windows pcs do. (which is normally the one I need to connect to.) Is there something wrong with my hardware? Or my software (my phone is completely up-to-date)? (Except broadcast the SSID, which is not an option..)
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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:
CODE:...........
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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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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Jan 11, 2010
My WakeLock isn't keeping my device awake.
In OnCreate() I've got:
CODE:...............
Then:
CODE:........
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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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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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:
CODE:..................
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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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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?
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Oct 20, 2009
I have the following code in Oncreate of my activity:
CODE:.......................
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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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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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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 :
CODE:.........
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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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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Mar 6, 2009
I have been looking at the ConnectivityManager class documented at http://developer.android.com/reference/android/net/ConnectivityManage... .
I would like to know if an Android application can open a network connection (socket) on a specified network interface [on a device supporting multiple network interface types WiFi, Cellular, WiMax etc] ? I am looking for the capability for an application to open a socket on a given type of network for example over WiFi network or over 3G Cellular Data network.
If this is possible in Android, how would I code this requirement within the API Framework ? The ConnectivityManager enables an application to learn about available network connections and currently categorises them as either TYPE_WIFI or TYPE_MOBILE.
There is a member function in the ConnectivityManager class called requestRouteToHost(int,int) [url] which "Ensure that a network route exists to deliver traffic to the specified host via the specified network interface. An attempt to add a route that already exists is ignored, but treated as successful." Sounds like this would install an IP routing table entry to reach a given host via a specified network interface type (WiFi or Mobile). After calling this would it be sufficient for an application to open a socket and connect to the desired destination address ?
Or perhaps the application needs to bind() a socket to a local address of a network interface of the desired type (WiFi or Mobile) Or by setting a socket-level socket option of SO_DONTROUTE ?
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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.
Code:
private void disableKeyGuard()
{
KeyguardManager km = (KeyguardManager)getSystemService(KEYGUARD_SERVICE);
kl = km.newKeyguardLock("SMSHandler");[code].....
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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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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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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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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 com.google.android.gsf.gtalkservice.androidendpoint.... 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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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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Aug 25, 2009
I would like to check whether there is any direct API available to check whether a particular Database exists or not ?
Currently, to initialize data for the first time (not repeatedly), we try of open the db and if it fails we know the database does not exists otherwise it is already created and initialized.
Is there any simple API available to check whether DB exists or not ?
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