android - 无法使用 gps 获取当前位置

Question

我已经添加了显示权限，我在模拟器上进行测试然后映射而不是 animateTo geopoint。我在 samsung galaxy mini 上测试然后应用程序崩溃:(。

代码:

public class atm_atmogan extends MapActivity {

private LocationManager myLocationManager;
private LocationListener myLocationListener;
private MapView myMapView;
private MapController myMapController;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.atm_atmogan);
    myMapView = (MapView)findViewById(R.id.map_view);
    myMapView.setTraffic(true); 
    myMapController = myMapView.getController();

    myLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    myLocationListener = new MyLocationListener();
    myLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,myLocationListener);

    //Get the current location in start-up
    double lat = myLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLatitude();
    double lot = myLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLongitude();
    GeoPoint initGeoPoint = new GeoPoint((int)(lat*1E6),(int)(lot*1E6));
    myMapController.animateTo(initGeoPoint);
    myMapController.setZoom(18); 
}

private class MyLocationListener implements LocationListener{
    public void onLocationChanged(Location loc) {
        GeoPoint myGeoPoint = new GeoPoint((int)(loc.getLatitude()*1E6),(int)(loc.getLongitude()*1E6));
        myMapController.animateTo(myGeoPoint);
        myMapController.setZoom(18); 
    }

    public void onProviderDisabled(String provider) {
        }

    public void onProviderEnabled(String provider) {
        }

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

@Override
protected void onPause() {
    super.onPause();
    myLocationManager.removeUpdates(myLocationListener);
}

@Override
protected void onResume() {
    super.onResume();
    myLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,myLocationListener);
}

@Override
protected boolean isRouteDisplayed() {
    return false;
};
}

日志:

02-08 14:31:15.481: D/dalvikvm(2292): GC freed 727 objects / 60152 bytes in 148ms
02-08 14:31:17.012: D/dalvikvm(2292): GC freed 143 objects / 7752 bytes in 68ms
02-08 14:39:10.801: W/KeyCharacterMap(2292): No keyboard for id 0
02-08 14:39:10.801: W/KeyCharacterMap(2292): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
02-08 14:39:17.081: E/ActivityThread(2292): Failed to find provider info for com.google.settings
02-08 14:39:17.091: E/ActivityThread(2292): Failed to find provider info for com.google.settings
02-08 14:39:17.112: E/ActivityThread(2292): Failed to find provider info for com.google.settings
02-08 14:39:17.372: D/LocationManager(2292): Constructor: service = android.location.ILocationManager$Stub$Proxy@44ebe658
02-08 14:39:17.683: I/MapActivity(2292): Handling network change notification:CONNECTED
02-08 14:39:17.683: E/MapActivity(2292): Couldn't get connection factory client
02-08 14:39:20.012: D/dalvikvm(2292): GC freed 5768 objects / 476800 bytes in 87ms
02-08 14:39:20.731: W/KeyCharacterMap(2292): No keyboard for id 0
02-08 14:39:20.731: W/KeyCharacterMap(2292): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
02-08 14:39:20.791:  D/LocationManager(2292): removeUpdates: listener = tim_atm.namespace.atm_atmogan$MyLocationListener@44ec2170
02-08 14:39:21.172: D/dalvikvm(2292): threadid=23 wakeup: interrupted

Answer 1

试试这个

 public class MyMapClass extends MapActivity {
MapController mapController;
MyPositionOverlay positionOverlay;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    MapView myMapView=(MapView)findViewById(R.id.myMapView);
    myMapView.setSatellite(true);
    myMapView.setBuiltInZoomControls(true);
    mapController=myMapView.getController();
    mapController.setZoom(17);
    positionOverlay = new MyPositionOverlay();
    List<Overlay> overlays = myMapView.getOverlays();
    overlays.add(positionOverlay);

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

        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);

        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){ }
            };

        updateWithNewLocation(location);
        locationManager.requestLocationUpdates(provider, 2000, 10,
                locationListener);  
}
private void updateWithNewLocation(Location location) {
    if(location!=null)  {
        // Update the map location.
        positionOverlay.setLocation(location);
        Double geoLat = location.getLatitude()*1E6;
        Double geoLng = location.getLongitude()*1E6;
        GeoPoint point = new GeoPoint(geoLat.intValue(),
        geoLng.intValue());
        mapController.animateTo(point);

    }
}   
@Override
protected boolean isRouteDisplayed() {

    return true;
}

MyPositionOverlay 类

  public class MyPositionOverlay extends Overlay {
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;
  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(250, 255, 0, 0);
  paint.setAntiAlias(true);
  paint.setFakeBoldText(true);
  Paint backPaint = new Paint();
  backPaint.setARGB(175, 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 Location getLocation() {
  return location;
  }
  public void setLocation(Location location) {
  this.location = location;
  }