The document discusses GPS technology and how to access GPS location data in an Android application. It provides an overview of how GPS works using satellites and atomic clocks to triangulate a receiver's position. It then outlines the steps to build an Android app that requests location permissions, sets up a LocationListener callback, and displays the current location on a map in a WebView when the position changes.

1. Android Application DevelopmentGPS AccessAhsanul Karimahsanul.karim@sentinelbd.comSentinel Solutions Ltd.http://www.sentinelbd.com

2. GPS Technology: SimplifiedThe Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day.

3. There are no subscription fees or setup charges to use GPS.GPS Technology: Simplified (Contd.)Global Positioning System satellites transmit signals to equipment (receivers) on the ground. GPS receivers passively receive satellite signals; they do not transmit.

4. GPS receivers require an unobstructed view of the sky

5. Depend on a very accurate time reference, which is provided by atomic clocks at the U.S. Naval Observatory. Each GPS satellite has atomic clocks on board.

6. Each GPS satellite transmits data that indicates its location and the current time.

7. All GPS satellites synchronize operations so that these repeating signals are transmitted at the same instant.

8. The signals, moving at the speed of light, arrive at a GPS receiver at slightly different times because some satellites are farther away than others.

9. The distance to the GPS satellites can be determined by estimating the amount of time it takes for their signals to reach the receiver.

10. When the receiver estimates the distance to at least four GPS satellites, it can calculate its position in three dimensions.

11. There are at least 24 operational GPS satellites at all times. The satellites, operated by the U.S. Air Force, orbit with a period of 12 hours. GPS Technology: Determining Position

12. GPS AccessCreate a project Named “UseGps”We need to add some permissions to use GPS and Internet