轴承和位置

Question

在执行用户当前位置标记的地图旋转任务时，这里有一些奇怪的事情。因此，我想做的就是像Google Maps应用程序上的第二个"当前位置"点击。在地图移动时，标记必须将其位置保持在地图中心。

我知道需要使用轴承值来更新googlemap v2上的相机位置对象。

CameraUpdate cameraUpdatePos;
            CameraPosition.Builder currentPlaceBuilder = new CameraPosition.Builder().target(loc);
            if (location.hasBearing())
                currentPlaceBuilder.bearing(location.getBearing());
            cameraUpdatePos = CameraUpdateFactory.newCameraPosition(currentPlaceBuilder.build());
            map.animateCamera(cameraUpdatePos);

这个错误是每个位置每次false hasbeartiar((呼叫结果都会返回，并且在我的应用程序上以0.0的速度承受0.0。但是Google Maps应用程序目前正确显示了我的方向。

我正在使用服务

LocationManager manager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        googleApiClient = new GoogleApiClient.Builder(context)
                .addConnectionCallbacks(gmsCallbacks)
                .addOnConnectionFailedListener(gmsCallbacks)
                .addApi(LocationServices.API)
                .build();
        locationRequest = LocationRequest.create();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                .setInterval(25 * 1000)
                .setFastestInterval(5 * 1000)
                .setSmallestDisplacement(1);
        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(locationRequest)
                .setAlwaysShow(true);`

和方法连接

`@Override
        public void onConnected(@Nullable Bundle bundle) {
            if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                    && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
                return;
            Log.i(TAG, "Connected");
            location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
            LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, gmsCallbacks);
            if (locationChangeCallback != null)
                locationChangeCallback.onLocationChanged(location);
        }`

有人知道Google Map如何对自动方向地图模式进行轴承计算？也许有人有这样的情况，可以帮助我提供建议。谢谢。

Answer 1

可以帮助您

public class GoogleApiActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener , {
SupportMapFragment fragment;
GoogleMap googleMap;
GoogleApiClient googleApiClient;
Marker marker;

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_google_api);
    mapLoading();
    googleClientApi();

}
private void mapLoading(){
    FragmentManager manager = getSupportFragmentManager();
    fragment = (SupportMapFragment) manager.findFragmentById(R.id.map_space);
    if (fragment == null)
    {
        fragment = SupportMapFragment.newInstance();
        manager.beginTransaction().replace(R.id.map_space, fragment).commit();
    }
}
@Override
protected void onResume(){
    super.onResume();
    if (googleMap == null){
        fragment.getMapAsync(this);
    }
}
@Override
public void onMapReady(GoogleMap googleMap){
    this.googleMap = googleMap;
    Toast.makeText(this, "Map Ready CallBack", Toast.LENGTH_SHORT).show();
    this.googleMap.setTrafficEnabled(true);
    this.googleMap.setIndoorEnabled(true);
    this.googleMap.setBuildingsEnabled(true);
    this.googleMap.getUiSettings().setZoomControlsEnabled(true);
    this.googleMap.setOnCameraChangeListener(this);
}

private void googleClientApi(){
    googleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();
}
@Override
public void onConnected(@Nullable Bundle bundle){
    LocationRequest locationRequest = createLocationRequest();
    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
    {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, createLocationRequest(),GoogleApiActivity.this);
}
@Override
public void onConnectionSuspended(int i){
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult){
}

public LocationRequest createLocationRequest()
{
    LocationRequest locationRequest = new LocationRequest();
    locationRequest.setInterval(0);
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setSmallestDisplacement(0);
    return locationRequest;
}
@Override
protected void onStart()
{
    super.onStart();
    if (googleApiClient != null)
    {
        googleApiClient.connect();
    }
}
@Override
protected void onStop()
{
    super.onStop();
    if (googleApiClient != null)
    {
        googleApiClient.disconnect();
    }
}
@Override
public void onLocationChanged(Location location){
    Toast.makeText(this, "Inside onLocationChanged  "+location.getAccuracy(), Toast.LENGTH_SHORT).show();
    if (location != null)
    {
        if (marker == null){
            marker = googleMap.addMarker(new MarkerOptions()
                    .position(new LatLng(location.getLatitude(), location.getLongitude()))
                    .title("My Location"));
            googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), 18));
        }else{
            marker.setPosition(new LatLng(location.getLatitude(),location.getLongitude()));
            updateCameraBearing(googleMap, location.getBearing(),location);
        }
    }    }
private void updateCameraBearing(GoogleMap googleMap, float bearing, Location location) {
    if ( googleMap == null) return;
    CameraPosition camPos = CameraPosition
            .builder(
                    googleMap.getCameraPosition() // current Camera
            ).target(new LatLng(location.getLatitude(),location.getLongitude()))
            .bearing(bearing)
            .build();
    googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(camPos));
}

}