Android :: How Often Does GetLastKnownLocation(LocationManager.NETWORK_PROVIDER) Return Null
Sep 10, 2010
Do the Android users have the chance to reset the NetworkProvider, so that the location will be null?
I came up with the idea, that its only possible to have that location null, after starting the device the very first time. But also than google will check the location right away for my opinion.
Sure, I'm implementing a default location for this rare case. I just want to know how seldom this case is.
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Oct 22, 2009
So I'm trying to sample the gps coordinates just once in an application. I don't want to create a LocationListener object to constantly get gps updates. I want to wait until receiving the coordinates, and then proceed on to another task.
Here is a code snippet
CODE:.................
The loc variable is always null in the emulator. I tried using the command "geo fix latitude longitude" to set it, and also I tried using the DDMS way of setting it. Neither method had any effect on the code. Also the snippet isn't causing any exceptions.
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Dec 16, 2009
I am facing with problem related to the Location API.
I tried the following code:
CODE:...................
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Feb 5, 2010
The GPS on my Android phone is on, supported by the fact that :
location_manager.isProviderEnabled(LocationManager.GPS_PROVIDER)
returns true. Yet, the following line: Location location = location_manager.getLastKnownLocation(LocationManager.GPS_PROVIDER); returns null.
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May 21, 2009
I'm having no luck getting getLastKnownLocation to return a non-null value in the Android emulator running in Eclipse. The following call always returns null:
locationManager.getLastKnownLocation(bestProvider);
(bestprovider is "gps")
In the intent's onCreate method I spawn a thread that calls requestFirstUpdate(). The onLocationChanged method fires so I presume the location was updated (I use the location section of the DDMS to push out a location first)..................
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Oct 17, 2009
I can't display my map on android emulator. i have, locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); location = locationManager.getLastKnownLocation("gps"); After those lines,the Log shows null for location instead of the object location
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Feb 1, 2010
I used to be able to use the GPS inside DDMS, now it doesn't work... Using English/Eclipse/Vista. Everything updated in eclipse->help-
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Jan 28, 2010
I'm trying to get the ANDROID_ID on two different devices but it always return null on both. I'm using a Google Ion (aka HTC Magic) with firmware 1.6 and a Motorola Milestone with firmware 2.0.
I've been using this small sample to show the id, but it always shows null:
CODE:........................
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Sep 10, 2009
As the title says? Or what situations can cause this method to return null? I would of thought it retained this object always.
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Jun 25, 2010
I am doing some android application. I just wonder what will case the managedQuery method return a null value?
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Dec 4, 2009
I wrote CustomView Class, and load it in layout. so i trid to find CustomView using findViewById() in activiy to get handle. but findViewById() was return null.
Written Code is like below:
CODE:.........
MapCanvas.java:
CODE:...............
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Aug 30, 2010
I'm building an android app and I'm currently having trouble retrieving a bitmap from an URL.
Here is the code I'm using :
CODE:..........
Everything works fine when the picture's write but when some bytes are wrong, result gets null. I think it's basically expectable as it's written this in the doc of BitmapFactory.decodeStream :
If the input stream is null, or cannot be used to decode a bitmap, the function returns null. The stream's position will be where ever it was after the encoded data was read.
The problem is, my wrong picture is well interpreted by my web browser and I can do so on iPhone platform.
Is there a way to sort of ignore those wrong pixels? maybe with the option parameter?
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Jun 27, 2010
I am trying to get the contacts from the phone but all I can get is the name, the phone numbers return null.
CODE:...............
After about 3 hours, I have figured it out:
CODE:...............
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Dec 2, 2009
I have read all the posts about this topic and I understand the arguments being made. However, I would like to know how Google Maps can return my *current* location yet while driving the same stretch of road, the Android API often (not always) gives me a last known location that was miles back. I need to be able to rely on the API to provide me with a *current location* and I have tried all the tricks being proposed here and elsewhere. Is there lower level code someplace that could ping the phone's radio for a "fresh fix?"
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Jul 20, 2010
Can someone tell me, what is the best way to deal with situations when there is no GPS signal or from some reason fix cannot be acquired?
The thing is that I thought that it would be sufficient just to use onStatusChanged method from LocationListener, but when there is no GPS signal it never calls this method. Why is that?
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Nov 12, 2010
In one application, when an activity start I use the getLastKnownLocation to get the last know position, using something like: Location position=mlocManager.getLastKnownLocation(mlocManager.getBestProvider(new Criteria(), true)); (in the onCreate)
After this, my application register a listener in the onResume() (and removes it in the onPause()), something like:........................
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Sep 8, 2010
in order to save some battery, I was wondering what happens if an activity registers a requestLocationUpdates and then the user (or the os) puts it in background or kills it. Will the location manger still be active and then will the pending intent still be fired? In other words, will the location manager still be alive even if its lancher does not exist anymore? I'd really love this scenario because allows me to link an intent service that handles the location updates without bothering of have something always running waiting for good news from location.
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Jan 19, 2010
How do I unsubscribe a LocationListener from recieving updates from the LocationManager?
mLocationManager = (LocationManager)this.getSystemService(LOCATION_SERVICE);
mListener = new LocationListener() {
public void onLocationChanged(Location location) {
Log.i("LocationListener", "Logging Change");
}
}
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
5000, 1, mListener);
After I have exited the the view that created the LocationListener I am still getting log messages in the LogCat window. I understand that this is because I am orphaning the listener but I cannot see any destory method on the LocationListener nor can I see any "remove listener" style methods on the LocationManager object.
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Nov 22, 2010
I set locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 60000, 0f, this);
It has an odd behavior, locationChanged gets called every second instead of any time close to 1 minute. Secondly, locationChanged gets called every second for like 10 seconds, then stops completely, the gps satalites icon disappears, then only resumes again when the screen returns from display timeout.
what's wrong? I'm currently on android 1.5.
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Jan 13, 2010
I'm using
CODE:......
To retrieve the current location at the start-up of my application.
As the Android documentation states, this location can be "out-of-date", since the method returns the location when the GPS was used the last time.
How can I actively request the current location from the GPS? I thought about using LocationListener, however that might be a bit of an overkill, since I only need the location once (at the start of my app).
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May 2, 2010
I tried using both getLastKnownLocation and requestLocationUpdates to get GPS coordinates from emulator.
CODE:......
After that, i tried:
CODE:............
-or-
CODE:.............
-or-
CODE:........
I get the same error for all three:
CODE:.............
I have set the GPS coordinates in DDMS Location Controls, also set coordinates using telnet and geo fix.
My manifest file has all permissions, dont know why im getting errors
CODE:.......................
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Jun 27, 2010
If I need to return my phone before the 30 days are up and they are out of stock, will they still honor the return policy and just call you when they have one available or will you have to stick with the phone that you have?
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Oct 19, 2010
I have an android application using LocationManager get the cell network location and not the Wifi location? If I have turned off the Wifi antenna and do the following:LocationManager lm = (LocationManager) paramContext.getSystemService(Context.LOCATION_SERVICE);I am always returned the Wifi location and not the cell network location. I want it to return the cell location since I have moved fromthe Wifi location. I tried using a LocationListener but that doesn't seem to help.
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Nov 17, 2010
I have a very simple app. I have simplified for sake of discussion, but I think this is a good representation.
My issue is that when I exit the app, the GPS continues receive updates. As far as I can tell the app never stops running, it just no longer displays the map activity.
I have to be missing something important.
CODE:..............
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Jan 28, 2010
I am having issues regarding a LocationListener in my Service called myService.
Here is my code:
///onStart method ..
onStart() {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE)
.
.
provider = locationManager.getBestProvider(criteria, true);
locationListener = (LocationListener) new MyLocationListener();
locationManager.requestLocationUpdates(provider, 0, 0, locationListener);
}
In my Activity there is a button which should stop the service. On the click of the button I am doing:
stopService(new Intent(getApplicationContext(), myService.class).................
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Mar 8, 2010
Is there an equivalent to Java's null layout in Android? Basically I want to specify the x and y coordinates of each component and not have the layout manager choose where they go. They will be within a scroll pane so it doesn't matter whether they fit on the screen.
I know null layouts are generally not a good idea but I have a special case where I need it. I'm porting a Java TV guide app and the program grid is made up of JLabels. The program dynamically generates them all, setting the x and y coords based on start/end time and channel. Each program could start and end at any time so as far as I know a table layout won't work.
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Jul 9, 2010
I have a picture in the setImageResource, but I want to make it null; so far I am using i.setImageResource(1), but would like to know a better way.
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Jan 30, 2009
I am trying to run a simple program which shows lat and long values but Location value is always null.
CODE:...
Emulator shows alert force close - wait
How can i debug line by line, at the moment i am usinng if, else to see veriable value.
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Sep 30, 2010
CODE:......
This is my preference xml. But
CODE:.............
Always returns null. I am debugging on a device (HTC Wildfire).
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Sep 7, 2010
I changed test.kml to test.xml.
When i tried this XmlResourceParser x = this.getResources().getXml(R.xml.test);
It returns null.
What am i missing?
Below is the kml.
CODE:.....................
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