我正在使用plasio turbo x测试我的osmdroid样本。我也在测试使用moto g。在moto g中，根据指南针抬起的地图旋转工作正常，但是在一个指南针中，指南针开始旋转并映射也旋转，它们不稳定。你可以看到logcat here（它非常大，stackoverflow不允许我在这里添加它。）
以下是我使用指南针的课程：
public class MainActivity extends FragmentActivity implements LocationListener, IOrientationConsumer,MapEventsReceiver {
private CompassOverlay mCompassOverlay = null;
private MyLocationNewOverlay mLocationOverlay;
IOrientationProvider compass = null;
int deviceOrientation = 0;
MapView mMapView;
float gpsspeed;
float gpsbearing;
float lat = 0;
float lon = 0;
float alt = 0;
long timeOfFix = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
final double lat1 = Double.parseDouble(intent.getStringExtra("lat1"));
final double long1 = Double.parseDouble(intent.getStringExtra("long1"));
final double lat2 = 25.633;
final double long2 = 71.094;
//important! set your user agent to prevent getting banned from the osm servers
org.osmdroid.tileprovider.constants.OpenStreetMapTileProviderConstants.setUserAgentValue(BuildConfig.APPLICATION_ID);
mMapView = (MapView) findViewById(R.id.map);
mMapView.setTileSource(TileSourceFactory.MAPNIK);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
mCompassOverlay = new CompassOverlay(this, new InternalCompassOrientationProvider(this),
mMapView);
mCompassOverlay.enableCompass();
mMapView.getOverlays().add(this.mCompassOverlay);
addOverlays();
GeoPoint startPoint = new GeoPoint(lat1, long1);
IMapController mapController = mMapView.getController();
mapController.setZoom(9);
mapController.setCenter(startPoint);
Marker startMarker = new Marker(mMapView);
startMarker.setPosition(startPoint);
startMarker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_BOTTOM);
mMapView.getOverlays().add(startMarker);
RoadManager roadManager = new OSRMRoadManager(this);
ArrayList<GeoPoint> waypoints = new ArrayList<GeoPoint>();
waypoints.add(startPoint);
GeoPoint endPoint = new GeoPoint(lat2, long2);
Marker endMarker = new Marker(mMapView);
endMarker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_BOTTOM);
mMapView.getOverlays().add(endMarker);
waypoints.add(endPoint);
Road road = roadManager.getRoad(waypoints);
Polyline roadOverlay = RoadManager.buildRoadOverlay(road);
mMapView.getOverlays().add(roadOverlay);
mMapView.invalidate();
}
public void addOverlays() {
mLocationOverlay = new MyLocationNewOverlay(mMapView);
mLocationOverlay.setEnableAutoStop(false);
mLocationOverlay.enableFollowLocation();
mLocationOverlay.enableMyLocation();
this.mMapView.getOverlayManager().add(mLocationOverlay);
mMapView.setBuiltInZoomControls(true);
mMapView.setMultiTouchControls(true);
mMapView.setTilesScaledToDpi(true);
}
@Override
protected void onResume() {
super.onResume();
//lock the device in current screen orientation
int orientation;
int rotation = ((WindowManager) this.getSystemService(
Context.WINDOW_SERVICE)).getDefaultDisplay().getRotation();
switch (rotation) {
case Surface.ROTATION_0:
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
this.deviceOrientation = 0;
break;
case Surface.ROTATION_90:
this.deviceOrientation = 90;
orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
break;
case Surface.ROTATION_180:
this.deviceOrientation = 180;
orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
break;
default:
this.deviceOrientation = 270;
orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
break;
}
this.setRequestedOrientation(orientation);
LocationManager lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
try {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, (LocationListener) this);
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, (LocationListener) this);
} catch (Exception ex) {
}
compass = new InternalCompassOrientationProvider(this);
compass.startOrientationProvider(this);
mMapView.getController().zoomTo(14);
}
@Override
public void onLocationChanged(Location location) {
if (mMapView == null)
return;
//after the first fix, schedule the task to change the icon
//mMapView.getController().setCenter(new GeoPoint(location.getLatitude(), location.getLongitude()));
mMapView.invalidate();
gpsbearing = location.getBearing();
gpsspeed = location.getSpeed();
lat = (float) location.getLatitude();
lon = (float) location.getLongitude();
alt = (float) location.getAltitude(); //meters
timeOfFix = location.getTime();
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
@Override
protected void onPause() {
super.onPause();
compass.stopOrientationProvider();
LocationManager lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
try {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
lm.removeUpdates(this);
} catch (Exception ex) {
}
//unlock the orientation
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
}
Float trueNorth = 0f;
@Override
public void onOrientationChanged(final float orientationToMagneticNorth, IOrientationProvider source) {
GeomagneticField gf = new GeomagneticField(lat, lon, alt, timeOfFix);
trueNorth = orientationToMagneticNorth + gf.getDeclination();
gf=null;
synchronized (trueNorth) {
if (trueNorth > 360.0f) {
trueNorth = trueNorth - 360.0f;
}
//use gps bearing instead of the compass
if (gpsspeed > 0.01f) {
float t = (360 - gpsbearing - this.deviceOrientation);
if (t < 0) {
t += 360;
}
if (t > 360) {
t -= 360;
}
mMapView.setMapOrientation(t);
} else {
//this part adjusts the desired map rotation based on device orientation and compass heading
float t = (360 - trueNorth - this.deviceOrientation);
if (t < 0) {
t += 360;
}
if (t > 360) {
t -= 360;
}
mMapView.setMapOrientation(t);
}
this.runOnUiThread(new Runnable() {
@Override
public void run() {
if (this!=null ) {
Toast.makeText(MainActivity.this, "GPS Speed: " + gpsspeed + "m/s GPS Bearing: " + gpsbearing +
"\nDevice Orientation: " + (int) deviceOrientation + " Compass heading: " + (int) orientationToMagneticNorth + "\n" +
"True north: " + trueNorth.intValue() + " Map Orientation: " + (int) mMapView.getMapOrientation() + "\n", Toast.LENGTH_SHORT).show();
}
}
});
}
}
@Override
public boolean singleTapConfirmedHelper(GeoPoint geoPoint) {
return false;
}
@Override
public boolean longPressHelper(GeoPoint geoPoint) {
return false;
}
}