Android Location and Maps
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The document discusses Android location services and maps. It provides an overview of the Android location framework for determining a device's location and listening for location updates. It also discusses using the Google Maps external library for displaying and managing maps. It covers topics like requesting location updates, permissions, and displaying latitude and longitude on a map. It also discusses custom markers and overlays for displaying graphics on maps.
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Android Location and Maps
- 1. Android Loca+on and Maps Jussi Pohjolainen
- 2. Loca+on Services and Maps • Android provides loca+on framework that your app can use to determine – Device’s loca+on – Listening for updates • Google maps external library available for displaying and managing maps
- 4. Loca+on Services • By using Loca+onManager you are able to – Query for the list of Loca+onProviders for the last known loca+on – Register for updates of the user’s current loca+on – Register for given Intent to be fired if the device comes within given proximity of given lat/long
- 5. Obtaining User Loca+on • Loca+on can be determined via GPS and/or cell tower + Wi-‐Fi signals • GPS is accurate, but needs outdoors, fix is slower and it uses more baQery. • To request loca+on, you use Loca+onManager -‐ class
- 6. Reques+ng Loca+on Updates Can be also GPS_PROVIDER Control the frequency which listener receives updates; min +me and min distance
- 7. Reques+ng User Permissions • You must add permissions in order to get user loca+on • ACCESS_COARSE_LOCATION – If you use NETWORK_PROVIDER • ACCESS_FINE_LOCATION – If you use GPS_PROVIDER or NETWORK_PROVIDER
- 8. Ge]ng Last Known Loca+on • First loca+on can take +me. Use cached loca+on! – Loca+on lastKnownLoca+on = loca+onManager.getLastKnownLoca+on(Loca+onManager .NETWORK_PROVIDER);
- 9. Mock Loca+on Data • If you don’t have Android device, you can use emulator for loca+on services by giving mock data • Mock data works only with GPS_PROVIDER • Use – Emulator Control View from Eclipse – DDMS (Dalvik Debug Monitor Server) – Geo command from console
- 11. Geo • Connect to emulator from console – telnet localhost <console-port> • Send the loca+on data – geo fix -121 46
- 12. GOOGLE MAPS EXTERNAL DIRECTORY
- 13. Google Maps • External API Add-‐On to Android SDK • Install Google APIs Add-‐On from Android SDK and AVD Manager (Google APIs by Google) • When developing, set Google API Add-‐On as target
- 14. Google APIs as Target
- 15. Overview 1. Add uses-‐library and internet permission to manifest file 2. Use the Maps API 3. Get Maps API key and sign your app
- 16. 1. Add uses-‐library element to Manifest file • Because we're using the Google Maps library, which is not a part of the standard Android library, we need to declare it in the Android Manifest – <uses-library android:name="com.google.android.maps" /> • Internet permissions (downloadable maps) – <uses-permission android:name="android.permission.INTERNET " />
- 17. 2. Use the Maps API: MapView <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mainlayout" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <com.google.android.maps.MapView android:id="@+id/mapview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" android:apiKey="Your Maps API Key" /> </RelativeLayout>
- 18. 2. Use the Maps API: Class
- 19. 3. Get Maps API key and Sign Your App • Create MD5 cer+ficate fingerprint either in release or in debug • Release – $ keytool -list -alias alias_name -keystore my-release-key.keystore • Debug – $ keytool -list -alias androiddebugkey - keystore <path_to_debug_keystore>.keystore - storepass android -keypass android • Path to debug keystore in Windows Vista – C:Users<user>.androiddebug.keystore
- 20. 3. Sign with the Service • hQp://code.google.com/android/maps-‐api-‐ signup.html
- 21. Showing La+tude and Longitude on Map mapView = (MapView) findViewById(R.id.mapview); mapController = mapView.getController(); int lat = (int) (loca+on.getLa+tude() * 1E6); int lng = (int) (loca+on.getLongitude() * 1E6); GeoPoint point = new GeoPoint(lat, lng); mapController.animateTo(point);
- 22. DISPLAYING GRAPHICS ON MAPS
- 23. Custom Markers • Overlay – Individual item on map • Create custom class that inherites ItemizedOverlay class • ItemizedOverlay class is a base class for an Overlay which consists of a list of OverlayItems.
- 24. ItemizedOverlay MyOverlayItems ArrayList<OverlayItem> items void addOverLay(OverlayItem i) OverlayItem createItem(int i) int size() …
- 26. From Ac+vity