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Day 9: Make Your App Location Aware using Location API

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Ahsanul Karim
Ahsanul Karim

On Day 9: We'll see how to use Location API to get user location from application with both: 1. GPS 2. Network

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Android Application Development GPS Access Ahsanul Karim ahsanul.karim@sentinelbd.com Sentinel Solutions Ltd. http://www.sentinelbd.com
GPS Technology: Simplified • The 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. • 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. • GPS receivers require an unobstructed view of the sky • 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. • Each GPS satellite transmits data that indicates its location and the current time. • All GPS satellites synchronize operations so that these repeating signals are transmitted at the same instant. • 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. • The distance to the GPS satellites can be determined by estimating the amount of time it takes for their signals to reach the receiver. • When the receiver estimates the distance to at least four GPS satellites, it can calculate its position in three dimensions. • 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
GPS Access 1. Create a project Named “UseGps” 2. We need to add some permissions to use GPS and Internet
GPS Access 3. Now we need add a location listener, so each time the GPS senses a new location, this callback function will be called from the android system. To do this, we need to add the fallowing code in the onCreate() method:
GPS Access 4. We now have to create MyLocationListener class that implements LocationListener and Implement methods for various events: · onLocationChanged ( Location Update ) · onProviderDisabled ( GPS Off ) · onProviderEnabled (GPS On )
GPS Access
GPS Access 5. Now we run the app in emulator and use emulator control to emulate the GPS module
GPS Access 6. Now we’ll add a webview to main.xml layout and show the location in a map 7. Capture the webview by findViewById()
GPS Access 8. Now when the location is changed 9. Lets run it again
GPS Access

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Day 9: Make Your App Location Aware using Location API

  • 1. Android Application Development GPS Access Ahsanul Karim ahsanul.karim@sentinelbd.com Sentinel Solutions Ltd. http://www.sentinelbd.com
  • 2. GPS Technology: Simplified • The 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. • There are no subscription fees or setup charges to use GPS.
  • 3. 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. • GPS receivers require an unobstructed view of the sky • 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. • Each GPS satellite transmits data that indicates its location and the current time. • All GPS satellites synchronize operations so that these repeating signals are transmitted at the same instant. • 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. • The distance to the GPS satellites can be determined by estimating the amount of time it takes for their signals to reach the receiver. • When the receiver estimates the distance to at least four GPS satellites, it can calculate its position in three dimensions. • 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.
  • 5. GPS Access 1. Create a project Named “UseGps” 2. We need to add some permissions to use GPS and Internet
  • 6. GPS Access 3. Now we need add a location listener, so each time the GPS senses a new location, this callback function will be called from the android system. To do this, we need to add the fallowing code in the onCreate() method:
  • 7. GPS Access 4. We now have to create MyLocationListener class that implements LocationListener and Implement methods for various events: · onLocationChanged ( Location Update ) · onProviderDisabled ( GPS Off ) · onProviderEnabled (GPS On )
  • 9. GPS Access 5. Now we run the app in emulator and use emulator control to emulate the GPS module
  • 10. GPS Access 6. Now we’ll add a webview to main.xml layout and show the location in a map 7. Capture the webview by findViewById()
  • 11. GPS Access 8. Now when the location is changed 9. Lets run it again