java - Android、Mapbox、位置、Java

Question

我使用 Mapbox 创建了一个 Android map 。我的 map 显示了我在 activity_main.xml 中设置的位置。当我点击一个按钮时，系统会找到“当前位置”并在该位置成功添加标记。但这里的问题是，我的 map 实际上并没有自动移动到当前位置。我该怎么做才能做到这一点？它总是 显示我在 activity_main.xml 中设置的位置。

代码

public class MainActivity extends Activity implements ActivityCompat.OnRequestPermissionsResultCallback {
private MapView mapView;
private MapboxMap map; //right now your map variable is null. In getMapAsync, you need to initialize map = mapboxMap;
Button myButton;
protected LocationManager locationManager;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    MapboxAccountManager.start(this, "myToken");
    final boolean permissionGranted = ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED;
    setContentView(R.layout.activity_main);
    mapView = (MapView) findViewById(R.id.mapview);
    myButton = (Button) findViewById(R.id.locate1);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(new OnMapReadyCallback() {
                        @Override
                        public void onMapReady(MapboxMap mapboxMap) {

                            Log.i("MapAsync", " is called");
                            //you need to initialize 'map' with 'mapboxMap'; 
                            map = mapboxMap;

                        }

                    });
    final GPSTracker gps = new GPSTracker(MainActivity.this);
    // On click on the 'Locate' button should add a 'new marker on map' with current location lat long 
    myButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (permissionGranted){
                // check if GPS is enabled
                if (gps.canGetLocation()) {

                    gps.location = gps.getLocation();

                    final double latitude = gps.getLatitude();
                    final double longitude = gps.getLongitude();

                    map.addMarker(new MarkerOptions()
                                    .position(new LatLng(latitude, longitude))
                                    .title("Hello user !")
                                    .snippet("Welcome to mapbox"));
                            //Adding the camera here as suggeted
                            CameraPosition cameraPosition = new CameraPosition.Builder()
                                    .target(new LatLng(gps.location.getLatitude(), gps.location.getLongitude()))      // Sets the center of the map to Mountain View
                                    .zoom(12)                   // Sets the zoom
                                    .bearing(90)                // Sets the orientation of the camera to east
                                    .tilt(30)                   // Sets the tilt of the camera to 30 degrees
                                    .build();                   // Creates a CameraPosition from the builder   

                           map.moveCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));

                    //  \n is for new line
                    Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();


                } else {
                    // can't get location
                    // GPS or Network is not enabled
                    // Ask user to enable GPS/network in settings
                    gps.showSettingsAlert();
                }

            }else {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 200);
            }

        }
    });

}



// Add the mapView lifecycle to the activity's lifecycle methods
@Override
public void onResume() {
    super.onResume();
    mapView.onResume();
}

@Override
public void onPause() {
    super.onPause();
    mapView.onPause();
}

@Override
public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mapView.onSaveInstanceState(outState);
}


public class TelemetryServiceNotConfiguredException extends RuntimeException {

    public TelemetryServiceNotConfiguredException() {
        super("\nTelemetryService is not configured in your applications AndroidManifest.xml. " +
                "\nPlease add \"com.mapbox.mapboxsdk.telemetry.TelemetryService\" service in your applications AndroidManifest.xml" +
                "\nFor an example visit  For more information visit https://www.mapbox.com/android-sdk/.");
    }

}
}

Answer 1

我不确定 Mapbox 是否使用与 GoogleMap 相同的方法名称。如果是这样，您可以在成功添加标记后尝试添加 map.moveCamera(CameraUpdateFactory.newLatLngZoom(YourLatLng, 15))。您也可以使用

CameraPosition cameraPosition = new CameraPosition.Builder()
.target(YourLatLng)      // Sets the center of the map to Mountain View
.zoom(17)                   // Sets the zoom
.bearing(90)                // Sets the orientation of the camera to east
.tilt(30)                   // Sets the tilt of the camera to 30 degrees
.build();                   // Creates a CameraPosition from the builder

map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));

为相机设置动画。

注意:15是缩放级别。

缩放级别

1: World

5: Landmass/continent

10: City

15: Streets

20: Buildings