Mobile Application Development Selected Topics – CPIT 490

Mobile Application Development Selected Topics – CPIT 490
Android Location Maps Mobile Application Development Selected Topics – CPIT 490 21-Apr-17

Objective Android Location MapViews Overlays
Google Maps External Library Location Services

Location Service Two main LBS elements
Location Manager: Provides hooks to the location-based services Location Providers: Each of these represents a different location- finding technology used to determine the device’s current location Location Manager Obtain current location Track movement Set proximity alerts for areas Find available Location Providers Location Providers Various location-finding technologies (GPS, Cellular network)

Global Positioning System (GPS)
--- Miami1795 km --- Caracas 1874 km --- Bogota 1251 km San Jose, CR

Cell Tower Triangulation
An alternative method to determine the location of a cell phone is to estimate its distance to three nearby cell towers. Distance of the phone to each antenna could be estimated based upon the lag time between the moment the tower sends a ping to the phone and receives the answering ping back. Quite similar to the 2D-Trilateration Method. Reference:

Latitude and Longitude
Latitude in GPS-Decimal notation: (North) to (South) Longitude GPS-Decimal notation: (East) to (West)

Latitude and Longitude

Google API Key (Google Maps v1)
To use the Google Map service an API key is needed. The API key can obtained as follows for development/debugging application: 1) Get debug.keystore file. You can find the location to the files under “Default debug keystore” from: Windows Preferences Android build. 2) Use keytool tool to generate Certificate fingerprint (MD5). Use following command on command prompt keytool -list -alias androiddebugkey -keystore <keystore_location>.keystore -storepass android -keypass android 3) Go to ‘Sign Up for the Android Maps API’ page. Put your Certificate fingerprint (MD5) And get your API key for android GMap application. 4) Replace “API_Key_String” in MapView layout item with your API key. Add the API key obtained in main.xml as <com.google.android.maps.MapView … android:apiKey=“key“ /> In AndroidManifest.xml add: <uses-permission android:name=”android.permission.INTERNET”/> <application … ><uses-library android:name=”com.google.android.maps” /></application>

In order to develop Google API based android applications, make sure the following are available: Obtain the SHA1 key: To obtain the SHA1 key, use C:\Program Files (x86)\Java\<jdk folder>\bin>keytool.exe -list -alias androiddebugkey -keystore C:\Users\mibuhari\.android\debug.keystore -storepass android -keypass android –v OR You could use the Eclipse to obtain the SHA1 key. This is possible using Window  Preferences  Android  Build Obtain the API key: Register your client ID and obtain Google API key at You will need to use your gmail login Under services, enable Google Maps Android API v2. You could click on Create New Android key to generate the key. You need your SHA1 key and the package name for this. Enter the values of SHA1 key and package name, separated with a semi-colon.

Note the API key obtain from the previous step. Also, note its validity period. Go to SDK Manager in Eclipse: Select the respective Google Maps API that matches the android version and install it; if you want to upgrade your Android API level, you need to use help  Install New Software Under Extras, select Google Play Services and install it Add the Google Play Services project into your Eclipse workspace. Click File -> Import..., select Android -> Existing Android Code into Workspace Browse to and select <android-sdk-folder>/extras/google/google_play_services/libproject/google-play-services_lib You don’t need to enable the option to copy the library into your workspace To add the dependency to Google Play Services into your project Project -> Properties -> Android -> Library, Add -> google-play-services_lib Update MainActivity.java to extend FragmentActivity instead of Activity Note: If there is an error with regards to a missing library, you need to right click on the project and go to Build Path and configure Build Path. In the libraries tab, remove the wrongly added libraries.

Your new API key will be a 40 character string Add the following tag into your AndroidManifest.xml just before the closing </application> tag <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="your_api_key"/> Your application now also needs the following permissions in the AndroidManifest.xml <permission android:name="your_package_name.permission.MAPS_RECEIVE“ android:protectionLevel="signature"/> <uses-permission android:name="your_package_name.permission.MAPS_RECEIVE"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>

Optionally you can include one or both of these permissions to enable auto-location <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> Maps v2 uses OpenGl so the following uses-feature is also required <uses-feature android:glEsVersion="0x " android:required="true"/> The layout file is like this: <?xml version="1.0" encoding="utf-8"?> <fragment xmlns:android=" xmlns:map=" android:layout_width="match_parent" android:layout_height="match_parent" android:name="com.google.android.gms.maps.MapFragment" map:cameraTilt="45" map:cameraZoom="14" />

Issues with Google Android Maps v2
In order to run the application on an Android device, whose android version is less that android version 12, use <fragment … android:name="com.google.android.gms.maps.SupportMapFragment" /> Instead of <fragment … android:name="com.google.android.gms.maps.MapFragment" /> Make sure Target build is Google API. You could check that on Right-click on Project  Preferences  Android  Project Build Target You need to check whether your project has google-play-services_lib as a library. Doing this process includes the google-play-services_lib.jar file into Android Dependencies for the current project. This is possible only after importing the google-play-services_lib into Eclipse. Possible errors and solutions: ClassNotFoundException: This error indicates that respective class is not found in the apk file. To solve this, you need to include the google-play-services_lib as a library to your project.

NOTE: Google Android API codes work only on Android device and not on the emulator. In the emulator, you get only the grids and no maps. Possible errors and solutions: Program opens and closes immediately: Happens in the emulator: There might be problems with the target SDK version or there is a mistake in the manifest file You need to have your network connection enabled Happens in the device: Check the minimum and Target SDK version provided in the Manifest file along with that of the mobile device itself. A mismatch in this will cause the program to crash Crashing of eclipse is possible with .metadata/.log indicating as below: Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.welcome Go to .metadata/.plugins folder and rename .metadata/.plugins/org.eclipse.e4.workbench to.metadata/.plugins/org.eclipse.e4.workbench.temp and restart eclipse

android.view.InflateException: Binary XML file line #2: Error inflating class fragment Make sure this entry is present in layout file android:name="com.google.android.gms.maps.SupportMapFragment“ Make sure to add the below in manifest file under <application> tag <meta-data android:name="com.google.android.gms.version" /> <meta-data android:name="com.google.android.maps.v2.API_KEY“ android:value="API-key" /> Google Maps Android API v2 only supports devices with OpenGL ES 2.0 and above This error is possible if your emulator selected does not support OpenGL ES 2.0 and also if the device does not support OpenGL ES 2.0. Library is missing while compiling the program. Also, import android.support.v4.app.FragmentActivity; has an error Right click on the project and choose properties. Then in Java Build Path, add android-support-v4.jar (ADT-Folder\sdk\extra\android\support\v4)as an external jar

Android Location Classes
The Android API provides Location data based on a variety of methods including: Cell Tower Triangulation, and most commonly GPS chip readings. GPS is the most common location provider on the Android based phones. It offers the most accuracy. Picture: Epson Infineon GPS (2.8 x 2.9mm) Reference:

Android Location Classes

Location Class A class representing a geographic location sensed at a particular time. A location consists of a latitude and longitude, a UTC timestamp and optionally information on altitude, speed, and bearing. Information specific to a particular provider or class of providers may be communicated to the application using getExtras, which returns a Bundle of key/value pairs. Each provider will only provide those entries for which information is available.

Location Values Format
The three common formats: There are sixty seconds in a minute (60" = 1') and There are sixty minutes in a degree (60' = 1°). Examples: DDD° MM' SS.S” 32° 18' 23.1" N 122° 36' 52.5" W DDD° MM.MMM’ 32° ' N 122° ' W DDD.DDDDD° ° N ° W or ,

Location Manager This class provides access to the system location services. These services allow applications 1. To obtain periodic updates of the device's geographical location, 2. or to fire an application-specified Intent when the device enters the proximity of a given geographical location. String service_name = Context.LOCATION_SERVICE; LocationManager locationManager = (LocationManager) getSystemService(service_name)

Location Manager’s Methods

LocationProvider Class
An abstract superclass for location providers. A location provider supplies periodic reports on the geographical location of the device. Each provider has a set of criteria under which it may be used; for example, some providers require GPS hardware and visibility to a number of satellites; others require the use of the cellular radio, or access to a specific carrier's network, or access to the Internet. They may also have different battery consumption characteristics or monetary costs to the user. The Criteria class allows providers to be selected based on user-specified criteria.

LocationProvider’s Methods

LocationProvider Class
Provider Reference String providerName = LocationManager.GPS_PROVIDER; LocationProvider gpsProvider; gpsProvider = locationManager.getProvider(providerName); Common Location Providers: LocationManager.GPS_PROVIDER LocationManager.NETWORK_PROVIDER Getting list of all providers boolean enabledOnly = true; List<String> providers = locationManager.getProviders(enabledOnly);

Finding Location Providers using Criteria
Provider with specific requirements Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_COARSE); criteria.setPowerRequirement(Criteria.POWER_LOW); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setSpeedRequired(false); criteria.setCostAllowed(true); String bestProvider = locationManager.getBestProvider(criteria, true); To get all matching Providers List<String> matchingProviders = locationManager.getProviders(criteria, false);

LocationListener Class
Used for receiving notifications from the LocationManager when the location has changed. These methods are called if the LocationListener has been registered with the location manager service using the method: requestLocationUpdates (Provider, minTime, minDistance, LocationListener)

LocationListener’s Methods

LocationListener String provider = LocationManager.GPS_PROVIDER;
int t = 5000; // milliseconds int distance = 5; // meters LocationListener myLocationListener = new LocationListener() { public void onLocationChanged(Location location) { // Update application based on new location. } public void onProviderDisabled(String provider){ // Update application if provider disabled. public void onProviderEnabled(String provider){ // Update application if provider enabled. public void onStatusChanged(String provider, int status, Bundle extras){ // Update application if provider hardware status changed. }; locationManager.requestLocationUpdates(provider, t, distance, myLocationListener);

Finding your location Reference Location Manager
String service_name = Context.LOCATION_SERVICE; LocationManager locationManager = (LocationManager) getSystemService(service_name) Permissions in Manifest <uses-permission android:name = "android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name = "android.permission.ACCESS_COARSE_LOCATION" /> Last location “fix” String provider = LocationManager.GPS_PROVIDER; Location location = locationManager.getLastKnownLocation(provider);

Example – Obtain Location from GPS
In this example we request GPS services and display latitude and longitude values on the UI. Notes 1. Observe the GPS chip is not a synchronous device that will immediately respond to a “give me a GPS reading” call. 2. In order to engineer a good solution that takes into account the potential delays in obtaining location data we place the UI in the main activity and the request for location call in a background service. 3. Remember the service runs in the same process space as the main activity, therefore for the sake of responsiveness we must place the logic for location data request in a separate parallel thread.

Example – Obtain Location from GPS

Geocoding Geocoding lets you translate between street addresses and longitude/latitude map coordinates. The geocoding lookups are done on the server, so your applications will require you to include an Internet uses-permission in your manifest, as shown here: <uses-permission android:name ="android.permission.INTERNET"/> The Geocoder class provides access to two geocoding functions: Forward geocoding: Finds the latitude and longitude of an address Reverse geocoding: Finds the street address for a given latitude and longitude The Geocoder object converts the latitude and longitude into an address using the getFromLocation() method For more details:

Reverse Geocoding Geocoder gc= new Geocoder(context, Locale.US);
List<Address> streets = gc.getFromLocation(latitude, longitude, 1); // search based on address // List<Address> addresses = geoCoder.getFromLocationName(“empire state building”, 5); if (addresses.size() > 0) { p = new GeoPoint((int) (addresses.get(0).getLatitude() * 1E6), (int) (addresses.get(0).getLongitude() * 1E6)); location = locationManager.getLastKnownLocation (LocationManager.GPS_PROVIDER); double latitude = location.getLatitude(); double longitude = location.getLongitude(); List<Address> addresses = null; Geocoder gc = new Geocoder(this, Locale.getDefault()); try { addresses = gc.getFromLocation(latitude, longitude, 10); } catch (IOException e) {}

Forward Geocoding Geocoder gc= new Geocoder(this);
// get decimal coordinates for up to 5 (best) matching locations List<Address> lstFoundAddresses= gc.getFromLocationName (txtStreetAddress, 5); Geocoder fwdGeocoder = new Geocoder(this, Locale.US); String streetAddress = "160 Riverside Drive, New York, New York"; List<Address> locations = null; try { locations = fwdGeocoder.getFromLocationName(streetAddress, 10); } catch (IOException e) {}

Emulating GPS Location
Use Eclipse’s DDMS > Emulator Control Keyhole Markup Language

Google Maps External Library (Google Maps v1)
Android uses the Google Maps External Library to add mapping capabilities to your applications. Google Maps External Library includes the com.google.android.maps package. The classes of this package offer built-in downloading, rendering, and caching of Maps tiles, as well as a variety of display options and controls. The key class in the Maps package is com.google.android.maps.MapView, a subclass of ViewGroup. The MapView provides an ideal user interface Road View option for presenting geographical data. Road View

Map Views (Google Maps v1)
MapViews support annotation using Overlays and by pinning Views to geographical locations. The Maps external library is not part of the standard Android library, so it may not be present on some compliant Android-powered devices. By default the Android SDK includes the Google APIs add-on , which in turn includes the Maps external library. MapViews offer full programmatic control of the map display, letting you control the zoom, location, and display modes — including the option to display satellite, street, and traffic views. Aerial View

Google Map Classes (Google Maps v1)
MapView is the Map View control. MapActivity is the base class you extend to create a new Activity that can include a Map View. MapActivity handles the application life cycle and background service management required for displaying maps. Map Views are used only within MapActivity-derived Activities. MapController is used to control the map, enabling you to set the center location and zoom levels. Overlay is the class used to annotate your maps. MyLocationOverlay is a special Overlay that can be used to display the current position and orientation of the device. ItemizedOverlays and OverlayItems are used together to let you create a layer of map markers, displayed using Drawables and associated text.

Creating a Map-Based Activity (Google Maps v1)
Manifest XML <uses-library android:name = "com.google.android.maps" /> <uses-permission android:name = "android.permission.INTERNET" /> Layout <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android=" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <com.google.android.maps.MapView android:layout_height="fill_parent" android:enabled="true" android:clickable="true" android:apiKey="mymapapikey" /> </LinearLayout>

MapActivity (Google Maps v1)
import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import android.os.Bundle; public class MyMapActivity extends MapActivity { private MapView mapView; private MapController mapController; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.map_layout); mapView = (MapView)findViewById(R.id.map_view); } protected boolean isRouteDisplayed() { // IMPORTANT: This method must return true if your Activity // is displaying driving directions. Otherwise return false. return false ; } }

Configuring and Using Map Views (Google Maps v1)
Specifying how the map is displayed. mapView.setSatellite(true); // satellite view mapView.setStreetView(true); mapView.setTraffic(true); // show traffic conditions on the map Querying the Map View. int maxZoom = mapView.getMaxZoomLevel(); GeoPoint center = mapView.getMapCenter(); int latSpan = mapView.getLatitudeSpan(); int longSpan = mapView.getLongitudeSpan(); Optionally display the standard map zoom controls mapView.setBuiltInZoomControls(true); Reference:

Using the Map Controller
Use the Map Controller to pan and zoom a MapView. getController get a reference to a MapView’s controller. MapController mapController = mapView.getController(); Map locations are represented by GeoPoint objects. Double lat = *1E6; // multiply by 1e6, which is one million Double lng = *1E6; GeoPoint point = new GeoPoint(lat.intValue(), lng.intValue()); Re-center and zoom the Map. mapController.setCenter(point); mapController.setZoom(1); // 1=widest (or most distant), 21=tightest (nearest) view ‘‘jump’’ to a new location mapController.animateTo(point); To redraw a map: mapView.invalidate();

Creating and Using Overlays
Overlays enable you to add annotations and click handling to MapViews. Each Overlay lets you draw 2D primitives, including text, lines, images, etc. All the Overlays assigned to a Map View are added as layers, with newer layers potentially obscuring older ones. User clicks are passed through the stack until they are either handled by an Overlay or registered as clicks on the Map View itself To add an overlay to a map that will handle tapping events, you can use onTouchEvent() method within the MapOverlay class. The method has two parameters: MotionEvent and MapView. Using the MotionEvent parameter, you can determine whether the user has lifted his or her finger from the screen using the getAction() method Reference:

Creating New Overlays To add a new Overlay create a new class that extends Overlay . Override the draw method to draw the annotations you want to add, and override onTap to react to user clicks import android.graphics.Canvas; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; public class MyOverlay extends Overlay { @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { if (shadow == false ) { //[ Draw annotations on main map layer ] } else { //[ Draw annotations on the shadow layer ] } } public boolean onTap(GeoPoint point, MapView mapView) { // Return true if screen tap is handled by this overlay return false ; } }

Projections The Projection class lets you translate between latitude/longitude coordinates (stored as GeoPoints) and x/y screen pixel coordinates (stored as Points). A map’s Projection may change between subsequent calls to draw, so it’s good practice to get a new instance each time. Projection projection = mapView.getProjection(); Use the fromPixel and toPixel methods to translate from GeoPoints to Points and vice versa. Point myPoint = new Point(); // To screen coordinates projection.toPixels(geoPoint, myPoint); // To GeoPoint location coordinates projection.fromPixels(myPoint.x, myPoint.y); To put a marker (pushpin image) on a specific location: Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pushpin); canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);

Drawing on the Overlay Canvas
// draw on the map @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { Projection projection = mapView.getProjection(); Double lat = *1E6; Double lng = *1E6; GeoPoint geoPoint = new GeoPoint(lat.intValue(), lng.intValue()); if (shadow == false ) { Point myPoint = new Point(); projection.toPixels(geoPoint, myPoint); // Create and setup your paint brush Paint paint = new Paint(); paint.setARGB(250, 255, 0, 0); paint.setAntiAlias(true); paint.setFakeBoldText(true); // Create the circle int rad = 5; RectF oval = new RectF(myPoint.x-rad, myPoint.y-rad, myPoint.x+rad, myPoint.y+rad); // Draw on the canvas canvas.drawOval(oval, paint); canvas.drawText("Red Circle", myPoint.x+rad, myPoint.y, paint); } }

Handling Map Tap Events
The onTap handler receives two parameters: A GeoPoint that contains the latitude/longitude of the map location tapped The MapView that was tapped to trigger this event @Override public boolean onTap(GeoPoint point, MapView mapView) { // Perform hit test to see if this overlay is handling the click if ([ perform hit test ]) { //[ execute on tap functionality ] return true ; } // If not handled return false return false ;

Adding and Removing Overlays
Each MapView contains a list of Overlays currently displayed. List<Overlay> overlays = mapView.getOverlays(); To add an Overlay onto a Map View, create a new instance of the Overlay and add it to the list Good practice to call postInvalidate after you modify the list to update the changes on the map display List<Overlay> overlays = mapView.getOverlays(); MyOverlay myOverlay = new MyOverlay(); overlays.add(myOverlay); mapView.postInvalidate(); projection.fromPixels(myPoint.x, myPoint.y);

My Location Overlay Special Overlay designed to show your current location and orientation on a MapView. List<Overlay> overlays = mapView.getOverlays(); MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, mapView); overlays.add(myLocationOverlay); Can display both your current location (represented as a flashing blue marker) and your current orientation (shown as a compass on the map display). myLocationOverlay.enableCompass(); myLocationOverlay.enableMyLocation(); Stopping the service myLocationOverlay.disableCompass(); myLocationOverlay.disableMyLocation(); Reference:

Additional Features Itemized Overlays and Overlay Items Classes
OverlayItems are used to supply simple maker functionality to your Map Views via the ItemizedOverlay class The ItemizedOverlay instance handles the drawing, placement, click handling, focus control, and layout optimization of each OverlayItem marker for you Extends ItemizedOverlay<OverlayItem> , override size() to return the number of markers to display and createItem() to create a new item based on the index of each marker Pinning Views to the Map and Map Positions You can pin any View-derived object to a Map View attaching it to either a screen position or a geographical map location Call addView() on the MapView, usually from the onCreate or onRestore methods within the MapActivity containing it. Pass in the View you want to pin and the layout parameters to use The MapView.LayoutParams parameters you pass in to addView determine how, and where, the View is added to the map

LocationManager In Android, location-based services are provided by the LocationManager class, located in the android.location package. Using the LocationManager class, your application can obtain periodic updates of the device’s geographical locations, as well as fire an intent when it enters the proximity of a certain location //---use the LocationManager class to obtain locations data--- lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); locationListener = new MyLocationListener(); Using LocationListener abstract class, we need to override four methods in this implementation: onLocationChanged(Location location) — Called when the location has changed onProviderDisabled(String provider) — Called when the provider is disabled by the user onProviderEnabled(String provider) — Called when the provider is enabled by the user onStatusChanged(String provider, int status, Bundle extras) — Called when the provider status changes

LocationManager To be notified whenever there is a change in location, you needed to register a request for location changes so that your program can be notified periodically. This is done via the requestLocationUpdates() method The requestLocationUpdates() method takes four arguments: provider — The name of the provider with which you register. In this case, you are using GPS to obtain your geographical location data minTime — The minimum time interval for notifications, in milliseconds. 0 indicates that you want to be continually informed of location changes. minDistance — The minimum distance interval for notifications, in meters. 0 indicates that you want to be continually informed of location changes. listener — An object whose onLocationChanged() method will be called for each location update To use the network provider, you need to add the ACCESS_COARSE_LOCATION permission to the AndroidManifest.xml Note: This will only work on real device and not on the emulator

LocationManager //---request for location updates--- for Network and GPS lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener); //---called when the provider is disabled--- public void onProviderDisabled(String provider) { … } //---called when the provider is enabled--- public void onProviderEnabled(String provider) { … } //---called when there is a change in the provider status--- public void onStatusChanged(String provider, int status, Bundle extras) { … } // monitoring the location //---PendingIntent to launch activity if the user is within some locations--- PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, new Intent(android.content.Intent.ACTION_VIEW, Uri.parse(“ 0); lm.addProximityAlert( , , 5, -1, pendingIntent); The addProximityAlert() method takes five arguments: latitude, longitude, radius (in meters), expiration (duration for which the proximity alert is valid, after which it is deleted; -1 for no expiration), and the pending intent

Additional Features In AndroidManifest.xml add the following within <application> tag to wake up an application upon receipt of an SMS <receiver android:name=”.SMSReceiver”> <intent-filter android:priority=”100”> <action android:name=”android.provider.Telephony.SMS_RECEIVED” /> </intent-filter> </receiver> List of Intents to invoking Google applications on Android devices

Location – Summary Permissions in the Manifest
Internet (if want Network-based location) <uses-permission android:name=“android.permission.INTERNET” /> Fine Location – NETWORK_PROVIDER, GPS_PROVIDER <uses-permission android:name=“android.permission.ACCESS_FINE_LOCATION” /> Coarse Location – only NETWORK_PROVIDER <uses-permission android:name=“android.permission.ACCESS_COARSE_LOCATION” /> LocationManager getSystemService(Context.LOCATION_SERVICE) LocationProvider locationManager.getProvider(LocationManager.GPS_PROVIDER) Make sure LocationProvider enabled locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)

Location – Summary Getting the Last Known Location
locationManager.getLastKnownLocation(locationProvider) Reverse Geocode the Location Instantiate a new Geocoder object Geocoder geocoder = new Geocoder(context, locale) Most likely to be Locale.ENGLISH Get location from Geocoder object List<Address> addresses = geocoder.getFromLocation(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude(), maxResults) First one is usually accurate enough for usage

Example 1 – Obtain Location from GPS
<?xml version= "1.0" encoding="utf-8"?> <LinearLayout android:id= android:layout_width= "fill_parent" android:layout_height= "fill_parent" android:orientation= "vertical" xmlns:android= " > <EditText android:id= android:layout_width= "fill_parent" android:layout_height= "120px" android:textSize= "12sp" > </EditText> <Button android:id= android:layout_width= "151px" android:layout_height= "wrap_content" android:text= "Stop Service" > </Button> </LinearLayout>

Manifest <?xml version ="1.0" encoding = "utf-8"?> <manifest xmlns:android = " package = "edu.odu.cs.cs495.mappinggps" android:versionCode = "1" android:versionName = "1.0" > <application android:icon = android:label = android:debuggable = "true" > <activity android:name = ".MyGPS" android:label = > <intent-filter> <action android:name = "android.intent.action.MAIN" /> <category android:name = "android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:name = "MyGpsService"> </service> </application> <uses-sdk android:minSdkVersion =“8" /> <uses-permission android:name = "android.permission.ACCESS_FINE_LOCATION" /> </manifest>

Main Activity: MyGPS // Request GPS location, show lat & long // Application logic and its BroadcastReceiver in the same class package edu.odu.cs.495.mappinggps; import android.app.Activity; import android.os.Bundle; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.telephony.gsm.SmsManager; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.*;

Main Activity: MyGPS public class MyGPS extends Activity { Buttonbtn StopService; TextView txtMsg; Intent intentMyService; ComponentName service; BroadcastReceiver receiver; String GPS_FILTER= "cs495.action.GPS_LOCATION";

Main Activity: MyGPS @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); txtMsg = (TextView) findViewById(R.id.txtMsg); // initiate the service intentMyService = new Intent(this, MyGpsService.class); service = startService(intentMyService); txtMsg.setText("MyGpsServicestarted-(see DDMS Log)"); // register & define filter for local listener IntentFilter mainFilter = new IntentFilter(GPS_FILTER); receiver = new MyMainLocalReceiver(); registerReceiver(receiver, mainFilter);

Main Activity: MyGPS btnStopService= (Button) findViewById(R.id.btnStopService); btnStopService.setOnClickListener(new OnClickListener() { public void onClick(View v) { try{ stopService(new Intent(intentMyService) ); txtMsg.setText("After stopingService: \n" + service.getClassName()); btnStopService.setText("Finished"); btnStopService.setClickable(false); } catch (Exception e) { Log.e("MYGPS" , e.getMessage()); } }); } //onCreate

Main Activity: MyGPS ////////////////////////////////////////////////////////////////////// @Override public void onDestroy() { super.onDestroy(); try { stopService(intentMyService); unregisterReceiver(receiver); } catch (Exception e) { Log.e("MAIN-DESTROY>>>", e.getMessage()); } Log.e("MAIN-DESTROY>>>", "Adios"); } // onDestroy

Main Activity: MyGPS // local RECEIVER private class MyMainLocalReceiver extends BroadcastReceiver{ @Override public void onReceive(Context localContext, Intent callerIntent) { double latitude = callerIntent.getDoubleExtra("latitude" ,-1); double longitude = callerIntent.getDoubleExtra("longitude" ,-1); Log.e("MAIN>>>" , Double.toString(latitude)); Log.e("MAIN>>>" , Double.toString(longitude)); String msg = " lat: " + Double. toString(latitude) + " " + " lon: " + Double.toString(longitude); txtMsg.append("\n" + msg); Toast.makeText(this, msg, 1000).show(); } } //MyMainLocalReceiver } //MyGPS

Main Activity: MyGpsService // This is the GPS service. Requests location updates // in a parallel thread. sends broadcast using filter. package edu.odu.cs.cs495.mappinggps; import android.app.Service; import android.content.Context; import android.content.Intent; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.os.IBinder; import android.os.Looper; import android.util.Log; import android.widget.Toast; public class MyGpsService extends Service { String GPS_FILTER= "cs495.action.GPS_LOCATION" ; Thread triggerService; LocationManager lm; GPSListener myLocationListener; boolean isRunning = true ;

Main Activity: MyGpsService @Override public Ibinder onBind(Intent arg0) { return null ; } public void onCreate() { super .onCreate(); } public void onStart(Intent intent, int startId) { super .onStart(intent, startId); Log. e("<<MyGpsService-onStart>>" , "I am alive-GPS!"); // we place the slow work of the service in its own thread so the // response we send our caller who run a "startService(...)" method // gets a quick OK from us.

Main Activity: MyGpsService triggerService = new Thread(newRunnable() { public void run() { try{ Looper.prepare(); // try to get your GPS location using the LOCATION.SERVIVE provider lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); // This listener will catch and disseminate location updates myLocationListener = new GPSListener(); long minTime = 10000; // frequency update: 10 seconds float minDistance = 50; // frequency update: 50 meter lm.requestLocationUpdates( //request GPS updates LocationManager.GPS_PROVIDER, minTime, minDistance, myLocationListener); Looper.loop(); } catch ( Exception e) { Log.e("MYGPS", e.getMessage() ); } } // run }); triggerService.start(); } // onStart

Main Activity: MyGpsService // location listener becomes aware of the GPS data and sends a broadcast private class GPSListener implements LocationListener{ public void onLocationChanged(Location location) { //capture location data sent by current provider double latitude = location.getLatitude(); double longitude = location.getLongitude(); //assemble data bundle to be broadcasted Intent myFilteredResponse = new Intent(GPS_FILTER); myFilteredResponse.putExtra("latitude", latitude); myFilteredResponse.putExtra("longitude", longitude); Log.e(">>GPS_Service<<" , "Lat:" + latitude + " lon:" + longitude); //send the location data out sendBroadcast(myFilteredResponse); }

Main Activity: MyGpsService public void onProviderDisabled(String provider) { } public void onProviderEnabled(String provider) { public void onStatusChanged(String provider, int status, Bundle extras) { }; //GPSListener class } // MyGPSService

Example 2 – Hello, Map View
Create a simple Activity that can view and navigate a map. Reference:

1. Start a new project/Activity called HelloMapView. 2. 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. Open the AndroidManifest.xml file and add the following as a child of the <application> element: <uses-library android:name="com.google.android.maps" /> 3. We also need access to the Internet in order to retrieve the Google Maps tiles, so the application must request the INTERNET permissions. In the manifest file, add the following as a child of the <manifest> element: <uses-permission android:name="android.permission.INTERNET" />

4. Now open the main layout file for your project. Define a layout with a com.google.android.maps.MapView inside a RelativeLayout: <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android=" apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <com.google.android.maps.MapView android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" android:apiKey = "Your Maps API Key " /> </RelativeLayout>

4. cont. The clickable attribute defines whether you want to allow user-interaction with the map. In this case, we set it "true" so that the user can navigate. The apiKey attribute holds the Google Maps API Key that proves your application and signer certificate has been registered with the Google Maps service. Because MapView uses Google Maps data, this key is required in order to receive the map data, even while you are For the purpose of this tutorial, you should register with the fingerprint of the SDK debug certificate. Once you've acquired the Maps API Key, insert it for the apiKey value.

5. Now open the HelloMapView.java file. For this Activity, we're going to extend the special sub-class of Activity called MapActivity, so change the class declaration to extend MapActicity, instead of Activity: public class HelloMapView extends MapActivity { 6. The isRouteDisplayed() method is required, so add it inside the class: @Override protected boolean isRouteDisplayed() { return false; } 7. Now go back to the HelloMapView class. At the top of HelloMapView, instantiate a handles for the MapView and the Map controller. MapView mapView; MapController controller;

8. Wire-up the XML layout widget and the Java controls. public void onCreate (Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); MapView mapView; mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true); GeoPoint point = new GeoPoint ( , ); // Miami City controller = map.getController(); controller.animateTo(point); controller.setZoom(3); }

9. In the previous fragment the mapView is activated by the use of the built-in zoom facility (new feature). This zoom control will appear at the center-bottom of the screen each time the user taps on the screen, and will disappear a few seconds later. 10. The MapController method .animateTo(geoPoint) center the map on the given coordinates. 11. The zoom factor range is (17 closest to the map). 12. Ready to run.

After panning to go south After tapping and zooming in Initial Map

Example 3 - GeoCoder In this example we will create an application that converts an address to its corresponding GeoPoint and displays the location on a Mapview. In the case of multiple possible locations a list of addresses is provided (TODO: show the list in a dialog box or list selector and allow the user to make her selection by clicking on the best choice. As an example try: “Main Ave. Ohio”)

Example 3 – GeoCoder Layout
<?xml version= "1.0" encoding="utf-8"?> <LinearLayout android:layout_width= "fill_parent" android:layout_height= "fill_parent" android:orientation= "vertical" xmlns:android= " > <TextView android:id= android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:text= "Address/Coordinates" /> <LinearLayout android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:orientation= "horizontal" > <EditText android:id= android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:layout_weight= "2" android:hint= "Enter location (address)" android:textSize= "18sp" /> <Button android:id= android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:padding= "10px" android:text= "Go" /> </LinearLayout> <com.google.android.maps.MapView android:id= android:apiKey= "0SN3rTw6p317v08_uva72oCS_hgPTe92J2t_nwQ" android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:layout_weight= "2" android:clickable= "true" /> </LinearLayout>

Example 3 – GeoCoder Manifest
<? xml version = "1.0" encoding = "utf-8" ?> < manifest xmlns:android = " package = “edu.odu.cs.cs495.geocoder" android:versionCode = "1" android:versionName = "1.0" >  < uses-permission android:name = "android.permission.ACCESS_COARSE_LOCATION" /> < uses-permission android:name = "android.permission.INTERNET" /> < uses-sdk android:minSdkVersion = “8" /> < application android:icon = android:label = > < uses-library android:name = "com.google.android.maps" /> < activity android:name = ".GeopointDemo1" android:label = ".GeopointDemo1" > < intent-filter > < action android:name = "android.intent.action.MAIN" /> < category android:name = "android.intent.category.LAUNCHER" /> </ intent-filter > </ activity > </ application > </ manifest >

Example 3 – GeoCoder // GeopointDemo1
// Enter address get location choices from a list // show MapView location from last list entry package edu.odu.cs.cs495.geocoder; import java.util.List; import android.app.AlertDialog; import android.app.Dialog; import android.location.Address; import android.location.Geocoder; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView;

Example 3 – GeoCoder public class GeopointDemo1 extends MapActivity {
private MapView myMap ; private Button btnSearch ; private EditText address ; private Geocoder gc ; private double lat ; private double lon ; protected boolean isRouteDisplayed() { return false ; } @Override public void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.main); Toast. makeText(this , "Try: MAIN AVE OHIO" , 1).show(); //define handle to map and attach zooming[+ -] capabilities myMap = (MapView) findViewById(R.id.myMap); myMap.setBuiltInZoomControls(true); gc = new Geocoder(this); address = (EditText) findViewById(R.id.myAddress);

Example 3 – GeoCoder btnSearch = (Button) findViewById(R.id.myBtnSearch); btnSearch .setOnClickListener( new OnClickListener() { public void onClick(View v) { String addressInput = address .getText().toString(); // Get input text try { // get up to 5 locations List<Address> lstFoundAddresses = gc.getFromLocationName(addressInput, 5); if (lstFoundAddresses.size() == 0) showInvalidAddressMsg(); else { showListOfFoundAddresses(lstFoundAddresses); //for now map the first address from the list navigateToLocation(lstFoundAddresses.get(0), myMap ); } } catch (Exception e) { Toast. makeText(getBaseContext(), e.getMessage(), 1).show(); } } // onClick }); // btnSearch }// onCreate

Example 3 – GeoCoder // Navigates a given MapView to the specified Longitude and Latitude public static void navigateToLocation(Address adr, MapView map) { try { //covert to integer representation of microdegrees double latitude = adr.getLatitude()* ; double longitude = adr.getLongitude()* ; // new GeoPoint to be placed on the MapView GeoPoint geoPt = new GeoPoint((int) latitude, (int) longitude); MapController mapCtrl = map.getController(); mapCtrl.animateTo(geoPt); // move map to the given point int maxZoomlevel = map.getMaxZoomLevel(); // detect maximum zoom level int zoomapCtrlhosenLevel = (int) ((maxZoomlevel + 1)/1.25); mapCtrl.setZoom(zoomapCtrlhosenLevel); // zoom at chosen level mapCtrl.setCenter(geoPt); //center the map around the given address map.setSatellite(false); // display only "normal road" mapview map.setTraffic(false); // do not show traffic info } catch (Exception e) { Log.e( "ERROR>>>" , e.getMessage() ); } } // navigateTo

Example 3 - GeoCoder private void showInvalidAddressMsg() {
Dialog locationError = new AlertDialog.Builder(GeopointDemo1. this) .setIcon(0) .setTitle("Error") .setPositiveButton("OK" , null ) .setMessage("Sorry, your address doesn't exist.") .create(); locationError.show(); } // showInvalidAddressMsg private void showListOfFoundAddresses (List<Address> foundAddresses){ String msg = "" ; for ( int i = 0; i < foundAddresses.size(); ++i) { // show results as address, Longitude and Latitude // TODO : for multiple results show a select-list, try : MAIN AVE OHIO Address a = foundAddresses.get(i); lat = a.getLatitude(); lon = a.getLongitude(); String adr = "\n" + a.getAddressLine(0) + "\n" + a.getAddressLine(1); msg += "\n" + i + " " + lat + " " + lon + adr; Toast. makeText (getApplicationContext(), msg, 1).show(); } } // showListOfFoundAddresses } //class

Example 3 - GeoCoder

Example 4 - Overlays In this example we map downtown Cleveland placing markers on important places around the city’s downtown and the Euclid Corridor. When the user taps on a marker a brief note with the name and description of the site appears, a long tap produces an invitation for a virtual tour of the site (to be done!)

Example 4 - Overlays <? xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout xmlns:android = " android:layout_width = "fill_parent" android:layout_height = "fill_parent" > < com.google.android.maps.MapView android:id = android:layout_height = "fill_parent" android:apiKey = "myapikey" android:clickable = "true" /> </ RelativeLayout >

Example 4 - Overlays <? xml version = "1.0" encoding = "utf-8" ?> <manifest xmlns:android = " package = “edu.odu.cs.cs495.overlays" android:versionCode = "1" android:versionName = "1.0" >  <uses-permission android:name = "android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name = "android.permission.INTERNET" /> <uses-sdk android:minSdkVersion = “8" /> <application android:icon = android:label = > <uses-library android:name = "com.google.android.maps" /> <activity android:name = "ClevelandOverlays" android:label = "Cleveland Overlays" > <intent-filter> <action android:name = "android.intent.action.MAIN" /> <category android:name = "android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>

Example 4 - Overlays package edu.odu.cs.cs495.overlays;
// Mapping CLEVELAND DOWNTOWN - OHIO // demonstrates SHORT & LONG TAP events import android.content.res.Resources.NotFoundException; import android.graphics.drawable.Drawable; import android.graphics.Canvas; import android.os.Bundle; import android.view.KeyEvent; import android.view.MotionEvent; import android.widget.Toast; import com.google.android.maps.GeoPoint; import com.google.android.maps.ItemizedOverlay; import com.google.android.maps.MapActivity; import com.google.android.maps.MapView; import com.google.android.maps.OverlayItem; import java.util.ArrayList; import java.util.List; public class ClevelandRocks extends MapActivity { // handle to the MapView private MapView map = null ; //next two variables are part of a test for longPress event private long lastTouchTimeDown = -1; private long lastTouchTimeUp = -1;

Example 4 - Overlays @Override
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); try { map = (MapView)findViewById(R.id.map); // place Terminal Tower at the Center of the map map.getController().setCenter(getPoint( , )); map.getController().setZoom(14); // range 1..21 map.setBuiltInZoomControls(true); Drawable marker = getResources().getDrawable(R.drawable.marker); //see note below marker.setBounds(0, 0, marker.getIntrinsicWidth(), marker.getIntrinsicHeight()); map.getOverlays().add(new SitesOverlay(marker)); map.setSatellite(false); } catch (NotFoundException e) { Toast.makeText(getApplicationContext(), e.getMessage(), 1).show(); } } // onCreate Note. You may pick any drawable marker from your SDK folder, say C:\Android\platforms\android-1.6\data\res\drawable

public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_S) { map.setSatellite(!map.isSatellite()); return(true); } return(super.onKeyDown(keyCode, event)); private GeoPoint getPoint(double lat, double lon) { return(new GeoPoint((int)(lat* ), (int)(lon* ))); protected boolean isRouteDisplayed() { return (false); }

Example 4 - Overlays private class SitesOverlay extends ItemizedOverlay<OverlayItem> { private List<OverlayItem> items = new ArrayList<OverlayItem>(); private Drawable marker = null ; public SitesOverlay(Drawable marker) { super (marker); this.marker = marker; items.add(new OverlayItem(getPoint( , ), "Terminal Tower", "AT the heart of the city" )); items.add(new OverlayItem(getPoint( , ), "Cleveland Browns Stadium", "Football legends since 1946" )); items.add(new OverlayItem(getPoint( , ), "Quicken Loans Arena", "Home of the Cleveland Cavaliers" )); items.add (new OverlayItem(getPoint( , ), "Progressive Field", "Cleveland Indians Home\nMajor League Baseball since 1900's" )); items.add(new OverlayItem(getPoint( , ), "Cleveland State University", "The People's University \nEngaged Learning" )); items.add(new OverlayItem(getPoint( , ), "Cleveland Clinic", "Top Hospital & Medical Research in the USA")); items.add(new OverlayItem(getPoint( , ), "Severance Hall", "Cleveland Orchestra - Best in the World")); items.add(new OverlayItem(getPoint( , ), "Case Western Reserve University", "One of the Nation's Top Universities")); items.add(new OverlayItem(getPoint( , ), "Cleveland Museum of Art", "Most Distinguished \nOpen Museum in the World")); items.add(new OverlayItem(getPoint( , ), "Rock & Roll Hall of Fame", "Preserving for the world \nthe history of RR music")); populate(); }

protected OverlayItem createItem(int i) { return(items.get(i)); } public void draw(Canvas canvas, MapView mapView, boolean shadow) { super.draw(canvas, mapView, shadow); boundCenterBottom(marker); } protected boolean onTap(int i) { // if time Difference between lastTouchTimeUp & lastTouchTimeDown is: // > 1500 millisec. it was a LONG TAP // < 1500 just a NORMAL tap // on LONG TAPs we may want to show a dialog box with additional // data about item i-th such as pictures, links to web-sites, ???, etc. String text = "NORMAL TAP" ; long pressTotalTime = lastTouchTimeUp - lastTouchTimeDown; if (pressTotalTime > 1500) { text = "LONG TAP" ; } Toast.makeText(getApplicationContext(), text + " " + pressTotalTime + " msec.\n" + items.get(i).getTitle() + "\n" + items.get(i).getSnippet(), 1).show(); return(true); }

Example 4 - Overlays // TODO implement longPress actions (such as dialog box showing // pictures, links, ???, of selected point. @Override public boolean onTouchEvent(MotionEvent event, MapView mapView) { //remember the initial time the user touches the screen if (event.getAction() == MotionEvent.ACTION_DOWN ) { lastTouchTimeDown = event.getDownTime(); lastTouchTimeDown = System.currentTimeMillis(); } if (event.getAction() == MotionEvent.ACTION_UP ) { lastTouchTimeUp = System.currentTimeMillis(); } return super.onTouchEvent(event, mapView); } public int size() { return(items.size()); } } // SitesOverlay } //class

Example 5 – My Location In this example we draw current location (and also compass) on the Map.

Example 5 – My Location Manifest file
<?xml version="1.0" encoding="utf--‐8"?> <manifest xmlns:android=" package="com.AndroidMapView" android:versionCode="1" android:versionName="1.0"> <uses‐sdk android:minSdkVersion= "8" /> <application <uses‐library android:name="com.google.android.maps" /> <activity android:name=".AndroidMapViewActivity" <intent‐filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent‐filter> </activity> </application> <uses‐permission android:name="android.permission.INTERNET"/> <uses‐permission android:name="android.permission.ACCESS_FINE_LOCATION"> </uses‐permission> </manifest>

Example 5 – My Location Main.xml
<?xml version="1.0" encoding="utf--‐8"?> <LinearLayout xmlns:android=" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" /> <com.google.android.maps.MapView android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" android:apiKey="Your Maps API key here" /> </LinearLayout>

Example 5 – My Location MyItemizedOverlay.java
package edu.odu.cs.cs495.mylocation; import java.util.ArrayList; import android.graphics.Canvas; import android.graphics.drawable.Drawable; import com.google.android.maps.GeoPoint; import com.google.android.maps.ItemizedOverlay; import com.google.android.maps.MapView; import com.google.android.maps.OverlayItem; public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem>{ private ArrayList<OverlayItem> overlayItemList = new ArrayList<OverlayItem>(); public MyItemizedOverlay(Drawable marker) { super(boundCenterBottom(marker)); // TODO Auto‐generated constructor stub populate(); }

Example 5 – My Location MyItemizedOverlay.java
public void addItem(GeoPoint p, String title, String snippet){ OverlayItem newItem = new OverlayItem(p, title, snippet); overlayItemList.add(newItem); populate(); } @Override protected OverlayItem createItem(int i) { // TODO Auto‐generated method stub return overlayItemList.get(i); } public int size() { // TODO Auto‐generated method stub return overlayItemList.size(); } public void draw(Canvas canvas, MapView mapView, boolean shadow) { // TODO Auto‐generated method stub super.draw(canvas, mapView, shadow); //boundCenterBottom(marker); }

Example 5 – My Location AndroidMapViewActivity.java
package edu.odu.cs.cs495.mylocation; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapView; import com.google.android.maps.MyLocationOverlay; import android.graphics.drawable.Drawable; import android.os.Bundle; public class AndroidMapViewActivity extends MapActivity { MyItemizedOverlay myItemizedOverlay = null; MyLocationOverlay myLocationOverlay = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); MapView mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true);

Example 5 – My Location AndroidMapViewActivity.java
Drawable marker=getResources().getDrawable(android.R.drawable.star_big_on); int markerWidth = marker.getIntrinsicWidth(); int markerHeight = marker.getIntrinsicHeight(); marker.setBounds(0, markerHeight, markerWidth, 0); myItemizedOverlay = new MyItemizedOverlay(marker); mapView.getOverlays().add(myItemizedOverlay); GeoPoint myPoint1 = new GeoPoint(0* , 0* ); myItemizedOverlay.addItem(myPoint1, "myPoint1", "myPoint1"); GeoPoint myPoint2 = new GeoPoint(50* , 50* ); myItemizedOverlay.addItem(myPoint2,"myPoint2", "myPoint2"); myLocationOverlay = new MyLocationOverlay(this, mapView); mapView.getOverlays().add(myLocationOverlay); mapView.postInvalidate(); } @Override protected boolean isLocationDisplayed() { // TODO Auto‐generated method stub return false; }

Example 5 – My Location AndroidMapViewActivity.java @Override
protected boolean isRouteDisplayed() { // TODO Auto‐generated method stub return false; } protected void onResume() { super.onResume(); myLocationOverlay.enableMyLocation(); myLocationOverlay.enableCompass(); protected void onPause() { // TODO Auto‐generated method stub super.onPause(); myLocationOverlay.disableMyLocation(); myLocationOverlay.disableCompass(); } }

References App Development for Smart Devices

Mobile Application Development Selected Topics – CPIT 490

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Mobile Application Development Selected Topics – CPIT 490

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