Android Open Source - android-openmap-framework Centered Map Activity

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License

The source code is released under:
Apache License
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Java Source Code

package com.jwetherell.openmap.activity;
//from w  w w .j  av  a2 s .  com
import java.util.List;
import android.content.Context;
import android.graphics.drawable.Drawable;
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.Overlay;
import com.google.android.maps.OverlayItem;
import com.jwetherell.openmap.R;
import com.jwetherell.openmap.data.UserData;
import com.jwetherell.openmap.overlay.HashMapItemizedOverlay;


/**
 * This class extends CustomMapActivity to keep the current location centered on
 * the screen.
 * 
 * @author Justin Wetherell <phishman3579@gmail.com>
 */
public abstract class CenteredMapActivity extends CustomMapActivity {

    protected static List<Overlay> mapOverlays = null;

    protected static HashMapItemizedOverlay gpsOverlay = null;
    private static OverlayItem overlayItem = null;
    private static Drawable icon = null;

    protected static LocationManager locationManager = null;
    protected static LocationListener locationListener = null;
    protected static int minMeters = 10;
    protected static int minTime = 10;

    /**
     * {@inheritDoc}
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Get the location manager
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        UserData.setLocation(locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER));
        locationListener = new MapLocationListener();

        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minTime, minMeters, locationListener);

        // Find the most recent lat/lon or if none use the default
        GeoPoint point = new GeoPoint(UserData.getLatitudeE6(), UserData.getLongitudeE6());

        // Move the map view to the point
        mapController.animateTo(point);

        // Get the overlays and add our GPS point
        mapOverlays = mapView.getOverlays();
        icon = getResources().getDrawable(R.drawable.icon);
        gpsOverlay = new HashMapItemizedOverlay(icon);
        overlayItem = new OverlayItem(point, "MyGps", "The current position of my GPS");
        gpsOverlay.addOverlay(overlayItem);
        mapOverlays.add(gpsOverlay);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onDestroy() {
        super.onDestroy();
        locationManager.removeUpdates(locationListener);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onStart() {
        super.onStart();
        setCenterOnGps();
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minTime, minMeters, locationListener);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onStop() {
        super.onStop();
        locationManager.removeUpdates(locationListener);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onResume() {
        super.onResume();
        setCenterOnGps();
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minTime, minMeters, locationListener);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onPause() {
        super.onPause();
        locationManager.removeUpdates(locationListener);
    }

    protected void setCenterOnGps() {
        Location loc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        updateLocation(loc);
    }

    protected void updateLocation(Location loc) {
        UserData.setLocation(loc);
        GeoPoint point = new GeoPoint(UserData.getLatitudeE6(), UserData.getLongitudeE6());

        gpsOverlay.removeOverlay(overlayItem);
        gpsOverlay.addOverlay(new OverlayItem(point, "MyGps", "The current position of my GPS"));
        mapView.invalidate();

        mapController.animateTo(point);
    }

    private class MapLocationListener implements LocationListener {

        public void onLocationChanged(Location loc) {
            if (loc == null) throw new NullPointerException();

            UserData.setLocation(loc);
            updateLocation(loc);
        }

        public void onProviderDisabled(String provider) {
            // Ignore
        }

        public void onProviderEnabled(String provider) {
            // Ignore
        }

        public void onStatusChanged(String provider, int status, Bundle extras) {
            // Ignore
        }
    }
}
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