My Position Overlay : Map « Core Class « Android

1. Android
2. Core Class
3. Map

My Position Overlay

   
package app.test;

import java.io.IOException;
import java.util.List;
import java.util.Locale;
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;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;


import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.RectF;
import android.location.Location;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;

class MyPositionOverlay extends Overlay {
  public Location getLocation() {
    return location;
  }
  public void setLocation(Location location) {
    this.location = location;
  }  
    Location location;
    private final int mRadius = 5;
  @Override
  public void draw(Canvas canvas, MapView mapView, boolean shadow) {
    Projection projection = mapView.getProjection();

    if (shadow == false) {
      // Get the current location
      Double latitude = location.getLatitude()*1E6;
      Double longitude = location.getLongitude()*1E6;
      GeoPoint geoPoint = new GeoPoint(latitude.intValue(),longitude.intValue());

      // Convert the location to screen pixels 
      Point point = new Point();
      projection.toPixels(geoPoint, point);

      RectF oval = new RectF(point.x - mRadius, point.y - mRadius, 
                             point.x + mRadius, point.y + mRadius);

      // Setup the paint
      Paint paint = new Paint();
      paint.setARGB(255, 255, 255, 255);
      paint.setAntiAlias(true);
      paint.setFakeBoldText(true);

      Paint backPaint = new Paint();
      backPaint.setARGB(180, 50, 50, 50);
      backPaint.setAntiAlias(true);

      RectF backRect = new RectF(point.x + 2 + mRadius, point.y - 3*mRadius,
                                 point.x + 65, point.y + mRadius);

      // Draw the marker
      canvas.drawOval(oval, paint);
      canvas.drawRoundRect(backRect, 5, 5, backPaint);
      canvas.drawText("Here I Am", point.x + 2*mRadius, point.y, paint);
    }
    super.draw(canvas, mapView, shadow);
  }
    
  @Override
  public boolean onTap(GeoPoint point, MapView mapView) {
    return false;
  }
}
public class Test extends MapActivity {

  MapController mapController;
  MyPositionOverlay positionOverlay;
   
  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);

    MapView myMapView = (MapView)findViewById(R.id.myMapView);
    mapController = myMapView.getController();
    
    // Configure the map display options
    myMapView.setSatellite(true);
    myMapView.setStreetView(true);
    
    // Zoom in
    mapController.setZoom(17);
    
    // Add the MyPositionOverlay
    positionOverlay = new MyPositionOverlay();
    List<Overlay> overlays = myMapView.getOverlays();
    overlays.add(positionOverlay);

    LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    criteria.setAltitudeRequired(false);
    criteria.setBearingRequired(false);
    criteria.setCostAllowed(true);
    criteria.setPowerRequirement(Criteria.POWER_LOW);
    String provider = locationManager.getBestProvider(criteria, true);

    Location location = locationManager.getLastKnownLocation(provider);

    updateWithNewLocation(location);

    locationManager.requestLocationUpdates(provider, 2000, 10, locationListener);
  }

  private final LocationListener locationListener = new LocationListener() {
    public void onLocationChanged(Location location) {
      updateWithNewLocation(location);
    }
   
    public void onProviderDisabled(String provider){
      updateWithNewLocation(null);
    }

    public void onProviderEnabled(String provider) {}

    public void onStatusChanged(String provider, int status, Bundle extras) {}
  };
  
  /** Update the map with a new location */
  private void updateWithNewLocation(Location location) {
    TextView myLocationText = (TextView)findViewById(R.id.myLocationText);

    String latLongString;
    String addressString = "No address found";

    if (location != null) {
      positionOverlay.setLocation(location);

      Double geoLat = location.getLatitude()*1E6;
      Double geoLng = location.getLongitude()*1E6;
      GeoPoint point = new GeoPoint(geoLat.intValue(), geoLng.intValue());

      mapController.animateTo(point);

      double lat = location.getLatitude();
      double lng = location.getLongitude();
      latLongString = "Lat:" + lat + "\nLong:" + lng;

      Geocoder gc = new Geocoder(this, Locale.getDefault());
      try {
        List<Address> addresses = gc.getFromLocation(lat, lng, 1);
        StringBuilder sb = new StringBuilder();
        if (addresses.size() > 0) {
          Address address = addresses.get(0);

          for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
            sb.append(address.getAddressLine(i)).append("\n");

          sb.append(address.getLocality()).append("\n");
          sb.append(address.getPostalCode()).append("\n");
          sb.append(address.getCountryName());
        }
        addressString = sb.toString();
      } catch (IOException e) {}
    } else {
      latLongString = "No location found";
    }
    myLocationText.setText("Your Current Position is:\n" + latLongString + "\n" + addressString);
  }

  @Override
  protected boolean isRouteDisplayed() {
    return false;
  }
}
//layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <TextView  
    android:id="@+id/myLocationText"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
  />
  <com.google.android.maps.MapView
    android:id="@+id/myMapView"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:enabled="true"
    android:clickable="true"
    android:apiKey="IsEmptyBsluf"
  />
</LinearLayout>

   
    
    
  

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