位置管理器未调用onlocationchanged方法

Question

LocationManager无法调用onLocationChanged，因此我无法获取当前位置。得到了api密钥，提供了包名和SHA1密钥，提供了所有依赖关系，应用了所有方法，输出始终都是该映射。我正在使用的物理设备有任何问题。

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {




private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if(requestCode==1)
    {
        if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED)
        {
            if(ContextCompat.checkSelfPermission(MapsActivity.this, Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED)
            {
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
            }
        }
    }

}



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
}


/**
 * Manipulates the map once available.
 * This callback is triggered when the map is ready to be used.
 * This is where we can add markers or lines, add listeners or move the camera. In this case,
 * we just add a marker near Sydney, Australia.
 * If Google Play services is not installed on the device, the user will be prompted to install
 * it inside the SupportMapFragment. This method will only be triggered once the user has
 * installed Google Play services and returned to the app.
 */
@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    locationManager=(LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
    locationListener=new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {

            LatLng myplace = new LatLng(location.getLatitude(),location.getLongitude());
            mMap.addMarker(new MarkerOptions().position(myplace).title("veraval").icon(BitmapDescriptorFactory.
                    defaultMarker(BitmapDescriptorFactory.HUE_RED)));
            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(myplace,20));

        }

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

        }

        @Override
        public void onProviderEnabled(String provider) {

        }

        @Override
        public void onProviderDisabled(String provider) {

        }
    };


    if (ContextCompat.checkSelfPermission(MapsActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
    } else {


        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

    }



}

这是我在地图中没有标记的情况下得到的输出，api键或代码是否有问题

Answer 1

在MapReady中尝试...

 googleApiClient = new GoogleApiClient.Builder(getContext()).addConnectionCallbacks(this).addApi(LocationServices.API).build();
 googleApiClient.connect();

希望有帮助。