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POandroid gps position accuracy circle
 

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    <p>I have a simple activity that gives the GPS position of the user. what i want to do is to draw a circle around the gps position. The circle gives an idea about the accuracy of GPS positioning. For example, if the accuracy is 6 meters, then the radius of the circle will be covering 6 meters . following is the code.</p> <pre><code>import java.util.List; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Point; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; public class ShowMap extends MapActivity { private MapController mapController; private MapView mapView; private LocationManager locationManager; private GeoUpdateHandler geoUpdateHandler; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.gps); mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true); mapView.setSatellite(true); mapController = mapView.getController(); mapController.setZoom(14); // Zoom 1 is world view geoUpdateHandler = new GeoUpdateHandler(); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { createGpsDisabledAlert(); } else { locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,geoUpdateHandler); } } private void createGpsDisabledAlert() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder .setMessage( "Your GPS is disabled! Would you like to enable it?") .setCancelable(false).setPositiveButton("Enable GPS", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { showGpsOptions(); } }); builder.setNegativeButton("Do nothing", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alert = builder.create(); alert.show(); } private void showGpsOptions() { Intent gpsOptionsIntent = new Intent( android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS); startActivity(gpsOptionsIntent); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } public class GeoUpdateHandler implements LocationListener { @Override public void onLocationChanged(Location location) { int lat = (int) (location.getLatitude() * 1E6); int lng = (int) (location.getLongitude() * 1E6); GeoPoint point = new GeoPoint(lat, lng); mapController.animateTo(point); // mapController.setCenter(point); MapOverlay mapOverlay = new MapOverlay(); mapOverlay.setPointToDraw(point); List&lt;Overlay&gt; listOfOverlays = mapView.getOverlays(); listOfOverlays.clear(); listOfOverlays.add(mapOverlay); } @Override public void onProviderDisabled(String provider) { // TODO Auto-generated method stub } @Override public void onProviderEnabled(String provider) { } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } } class MapOverlay extends Overlay { private GeoPoint pointToDraw; public void setPointToDraw(GeoPoint point) { pointToDraw = point; } public GeoPoint getPointToDraw() { return pointToDraw; } @Override public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { super.draw(canvas, mapView, shadow); // convert point to pixels Point screenPts = new Point(); mapView.getProjection().toPixels(pointToDraw, screenPts); // add marker Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pen); canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 128, null); return true; } } @Override public void onPause() { super.onPause(); locationManager.removeUpdates(geoUpdateHandler); } } </code></pre>
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