android - 动画显示用户位置 (Android)

Question

我正在开发一个项目，该项目具有显示(动画)当前用户位置和一个硬编码位置(给定纬度和经度)的一项功能。到目前为止，我的硬编码位置可以正常工作，但我不知道如何获取用户位置。我试过位置监听器，但我的应用程序在运行后一直崩溃。有人对此有什么建议吗？非常感激。这是代码:

 public class LocationsActivity extends MapActivity implements LocationListener {

MapView mapView;
MapController mc;
GeoPoint p;
LocationListener locListener;



public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.location);

    mapView = (MapView)findViewById(R.id.mapView);
    mapView.setBuiltInZoomControls(true);

    mc = mapView.getController();
    String coordinates[] = {"52.67596","-8.64910"};
    double lat = Double.parseDouble(coordinates[0]);
    double lng = Double.parseDouble(coordinates[1]);

    p = new GeoPoint((int)(lat*1E6),(int)(lng*1E6));
    OverlayItem overlayitem = new OverlayItem(p, "Limerick Institute of 
        Technology", "Moylish");




    mc.animateTo(p);
    mc.setZoom(17);

    List<Overlay> mapOverlays = mapView.getOverlays();
    Drawable drawable = this.getResources().getDrawable(R.drawable.pushpin);
    HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable, 
        this);
    itemizedoverlay.addOverlay(overlayitem);
    mapOverlays.add(itemizedoverlay);
    mapView.invalidate();
}


@Override
protected boolean isRouteDisplayed() {
    // TODO Auto-generated method stub
    return false;
}


public void onLocationChanged(Location arg0) {
    // TODO Auto-generated method stub

}


public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub

}


public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub

}


public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}


 }

Answer 1

如果您使用的是 MapActivity，那么您可以使用以下代码:

/**
 * Set current location using MyLocationOverlay
 */
public void setCurrentLocation() {

    myLocationOverlay.runOnFirstFix(new Runnable() {
        @Override
        public void run() {

            if (null != myLocationOverlay.getMyLocation()) {

                /**
                 * Put extra sleep to avoid concurrentModicationException
                 */
                try {
                    Thread.sleep(1000);

                } catch (Exception e) {
                    // TODO: handle exception
                }
                map.getController().animateTo(
                        myLocationOverlay.getMyLocation());

                map.getOverlays().add(myLocationOverlay);

            }

        }
    });

}

如果您使用的是 MapFragment，那么在 Activity 中:

1. mapFragment.getMap().setMyLocationEnabled(true);

然后调用

    private void moveMapToMyLocation() {

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

    Criteria crit = new Criteria();

    Location loc = locMan.getLastKnownLocation(locMan.getBestProvider(crit,
            false));

    CameraPosition camPos = new CameraPosition.Builder()

    .target(new LatLng(loc.getLatitude(), loc.getLongitude()))

    .zoom(12.8f)

    .build();

    CameraUpdate camUpdate = CameraUpdateFactory.newCameraPosition(camPos);

    mapFragment.getMap().moveCamera(camUpdate);

}