I have referred many questions on this topic, but it seems some of my requirements are missing:
~0.0001
accuracyIs there any way to get just the co-ordinates with above mentioned requirements? Any sample code snippet will be much appreciated.
Checking various apps like "Locate Me", "Maverick", which claim to show offline locations. But in various scenarios without internet, they don't give track the location (in India).
I have referred plenty of old/new questions inside/outside SO. Below are few:
[Note: I am asking this question on behalf of my Android team and will be happy to clarify the details if asked for. Should you feel that this post belongs to Android.Stackexchange, then kindly move it.]
Yes. On both iOS and Android phones, any mapping app has the ability to track your location without needing an internet connection. Without getting too complicated, the GPS system inside your smartphone works in two different ways. When you have a data connection, your phone uses Assisted GPS, or A-GPS.
Steps to get current latitude and longitude in Android Location permissions for the manifest file for receiving the location update. Create a LocationManager instance as a reference to the location service. Request location from LocationManager. Receive location update from LocationListener on change of location.
1. I want to get the GPS location at ~0.0001 accuracy
You can listen only to GPS provider and discard a location when it doesn't have the minimun accuracy you want:
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 5, myLocationListener); // "myLocationListener" must be an object from a class that implements LocationListener // "myLocationListener" implementation of LocationListener.onLocationChanged public void onLocationChanged(Location location) { int MIN_ACCURACY = 5; // in metters if ((!location.hasAccuracy()) || (location.getAccuracy() > MIN_ACCURACY)) { // discard this location and keep listening to new location readings } else { // that's a good reading! // do somethings you want... blah, blah, blah... // stop updates when you get the location to preserve users' battery. locationManager.removeUpdates(myLocationListener); } }
2. Don't want to use internet; Though GSM/CDMA network is ok
Yes, GPS works totally off-line. Android can make use of internet ONLY to update A-GPS data cache and provide faster reads in cold-start updates.
3. Should be obtained programmatically when the app starts
Then call item locationManager.requestLocationUpdates
on mainActivity's onCreate event.
4. Should be quicker, say within a minute (like iPhone, which probably works in Airplane mode as well!)
Keep in mind that iPhone works with "high quality hardware". Android can be run on crappy devices. So it'll depend of:
5. The code should work in most of the devices
What is the oldest Android's API you want it to run?
6. The phone may switch-on/off anytime and travel any distance
I didn't get it. What is your concern about this?
Update 1:
"...I would like to use Android 4.0 and above..."
I've tested GPS features from Android 2.3 to 5.0 devices. Everything runs pretty fine on all of them.
"...I have observed that 1 geo-coordinates based demo app which was working in other devices, din't work in my LGG3 with Android 5.0. Any idea on that?..."
Did you check GPS permissions on Android settings? (Maybe it's disabled) Or can be a hardware issue? Did you try in another similar device?
"...Suppose the GPS is showing correct location in New York, I switch off the phone and then switch on after reaching to London, then will it still show correct location (without internet)?..."
Sounds you're confusing things: reading a GPS location is one thing. Showing that location into a MAP is another different thing!
You don't need to be connected to the internet to do GPS location reading. But, if you want to show that location into a MAP, probably you're gonna need internet (to load map resources, etc.).
If you nedd to stay collecting GPS locations periodically (let's say, from 10 to 10 minutes), then it will be better to use AlarmManager to schedule a timer that will "finger" your app and say "hey, time to make a GPS reading!".
"...Also what is your opinion about the latest Fused API?..."
I've tested it and used it for a while, but I gave it up. It needs that Google Play Services be installed to work (not a problem, most users have it on their devices). But if you need ACCURACY (as I do), it will not work. It uses "fused sensors" (accelerometer, gps, wifi, compass, etc...) to try to get user location with minimum power possibile. Sometimes, it says you're 10 miles away from where you're really is. I couldn't make it work fine to keep the "path" where user has been. But it really saves battery.
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