I agree that D-GPS will take a while to obtain the TFF(time to first
fix) without A-GPS
An app should support both as I have found only one device with D-GPS
and it has A-GPS support but without a cell/data plan the A-GPS will not work.
But, the app can be coded to support both as well as either, as you
could be out of range of a cell tower but in range of GPS.
According to the documentation:
a call like this can select either or both
locationProvider = locationManager.getBestProvider(myCriteria,b)
public static final String ACCESS_COARSE_LOCATION
Since: API Level 1
Allows an application to access coarse (e.g., Cell-ID, WiFi) location
Constant Value: "android.permission.ACCESS_COARSE_LOCATION"
public static final String ACCESS_FINE_LOCATION
Since: API Level 1
Allows an application to access fine (e.g., GPS) location
Constant Value: "android.permission.ACCESS_FINE_LOCATION"
----- Original Message -----
From: "Tim" <[email protected]>
To: "Android Discuss" <[email protected]>
Sent: Thursday, March 11, 2010 12:47 PM
Subject: [android-discuss] Re: D-GPS Enabled Development Phones
On Mar 11, 2:50 pm, "paul zazzarino" <[email protected]>
wrote:
> You will only get A-GPS if you use the phone on a data plan, this uses cell
> towers.
>
> While the D-GPS works completely independently of cell towers and off of GPS
> satellites.
>
> One can code to both or one.
No, your code doesn't (and can't) care about what kind of GPS is being
used.
> The reason for picking up a D-GPS enabled device is not buy the darn data
> plan which the carrier provides.
GPS still works with neither A-GPS nor D-GPS. It will just take a
minute to get a lock. Also does D-GPS even include the lock data? I'd
wager it doesn't, and a D-GPS phone without a data plan will still
take a while to get a lock.
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