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POHow to measure area from current location to another location using GPS coordinates in android
 

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  1. POHow to measure area from current location to another location using GPS coordinates in android
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    <p>I am developing an application in Android Tablet,i got a new requirement that i need to find out the distance between one point to other selected point can any one please help me how to achieve this</p> <p>I found that in google maps we have one option called Measure in Labs menu i need same kind of requirement can any one tell me how to invoke/implement programatically measured feature in Google maps.</p> <p>Please check the below image for better understanding.</p> <p>Waiting for your valuable inputs...<img src="https://i.stack.imgur.com/l6mSv.jpg" alt="enter image description here"></p> <p>I am using below code for showing current gps location now i need to know how to point other location and draw line and then measure area please check my code and suggest me</p> <pre><code>public class Tracking extends MapActivity implements LocationListener { LocationManager locman; LocationListener loclis; Location Location; private MapView map; List&lt;GeoPoint&gt; geoPointsArray = new ArrayList&lt;GeoPoint&gt;(); private MapController controller; String provider = LocationManager.GPS_PROVIDER; double lat; double lon; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initMapView(); initMyLocation(); locman = (LocationManager)getSystemService(Context.LOCATION_SERVICE); //locman.requestLocationUpdates(provider,60000, 100,loclis); //Location = locman.getLastKnownLocation(provider); } /** Find and initialize the map view. */ private void initMapView() { map = (MapView) findViewById(R.id.mapView); controller = map.getController(); map.setSatellite(false); map.setBuiltInZoomControls(true); } /** Find Current Position on Map. */ private void initMyLocation() { final MyLocationOverlay overlay = new MyLocationOverlay(this, map); overlay.enableMyLocation(); overlay.enableCompass(); // does not work in emulator overlay.runOnFirstFix(new Runnable() { public void run() { // Zoom in to current location controller.setZoom(24); controller.animateTo(overlay.getMyLocation()); } }); map.getOverlays().add(overlay); } @Override public void onLocationChanged(Location location) { if (Location != null){ lat = Location.getLatitude(); lon = Location.getLongitude(); GeoPoint New_geopoint = new GeoPoint((int)(lat*1e6),(int)(lon*1e6)); controller.animateTo(New_geopoint); geoPointsArray.add(New_geopoint); } } public double getDistance(double lat1, double lon1, double lat2, double lon2) { double latA = Math.toRadians(lat1); double lonA = Math.toRadians(lon1); double latB = Math.toRadians(lat2); double lonB = Math.toRadians(lon2); double cosAng = (Math.cos(latA) * Math.cos(latB) * Math.cos(lonB-lonA)) + (Math.sin(latA) * Math.sin(latB)); double ang = Math.acos(cosAng); double dist = ang *6371; return dist; } class MyOverlay extends Overlay{ public MyOverlay(){ } public void draw(Canvas canvas, MapView mapv, boolean shadow){ super.draw(canvas, mapv, shadow); Projection projection = map.getProjection(); Path p = new Path(); for (int i = 0; i &lt; geoPointsArray.size(); i++) { if (i == geoPointsArray.size() - 1) { break; } Point from = new Point(); Point to = new Point(); projection.toPixels(geoPointsArray.get(i), from); projection.toPixels(geoPointsArray.get(i + 1), to); p.moveTo(from.x, from.y); p.lineTo(to.x, to.y); } Paint mPaint = new Paint(); mPaint.setStyle(Style.STROKE); mPaint.setColor(0xFFFF0000); mPaint.setAntiAlias(true); canvas.drawLine(0, 4,5,50, mPaint); canvas.drawPath(p, mPaint); super.draw(canvas, map, shadow); } } @Override public void onProviderDisabled(String provider) { // TODO Auto-generated method stub } @Override public void onProviderEnabled(String provider) { // TODO Auto-generated method stub } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } @Override public void onStatusChanged(String arg0, int arg1, Bundle arg2) { // TODO Auto-generated method stub }} </code></pre>
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    1. COdo you know GPS coordinates of both points ?
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    2. COdo u want in kms ?
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    3. COi want to find area in acres
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