应用程序启动地图活动后，如何在 android 的地图中显示我的当前位置

Posted 2023-04-14

【中文标题】应用程序启动地图活动后，如何在 android 的地图中显示我的当前位置

【英文标题】：How to show my current location in maps in android as soon as the app starts the map activity

【发布时间】：2017-04-21 15:41:21

【问题描述】：

该怎么做，一旦我打开我的应用程序的地图活动，它就会在谷歌地图上显示我当前的位置，并用当前街道地址填充文本视图。我搜索了很多但没有任何方法都可以做到这一点。即使运行时权限也不起作用。将标记获取到我当前位置的按钮没有响应。没有显示错误。 这是我的地图活动。

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener,
    GoogleMap.OnMarkerDragListener,
    GoogleMap.OnMapLongClickListener, View.OnClickListener

private GoogleMap mMap;
private double vlatitude, vlongitude;
private GoogleApiClient vgoogleApiClient;
private Button getButton;

@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);

    //Initializing googleapi client
    vgoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();

    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) 

        return;
    

    mMap.setMyLocationEnabled(true);
    getButton = (Button) findViewById(R.id.buttongetme);
    getButton.setOnClickListener(this);


@Override
protected void onStart() 
    vgoogleApiClient.connect();
    super.onStart();


@Override
protected void onStop() 
    vgoogleApiClient.disconnect();
    super.onStop();

@Override
public void onMapReady(GoogleMap googleMap) 
    mMap = googleMap;

    LatLng sydney = new LatLng(-34, 151);
    mMap.addMarker(new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.mipmap.tiltpink)).position(sydney).draggable(true).title("Marker in Sydney"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    mMap.setOnMarkerDragListener(this);
    mMap.setOnMapLongClickListener(this);
    mMap.getUiSettings().setMyLocationButtonEnabled(true);


private void getCurrentLocation() 

    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) 

        return;
    
    Location location = LocationServices.FusedLocationApi.getLastLocation(vgoogleApiClient);
    if (location != null)
        vlongitude = location.getLongitude();
        vlatitude = location.getLatitude();
        moveMap();
    


private void moveMap() 
    LatLng latLng = new LatLng(vlatitude,vlongitude);
    mMap.addMarker(new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.mipmap.tiltpink)).position(latLng).draggable(true).title("Current Location"));

    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
    mMap.animateCamera(CameraUpdateFactory.zoomTo(15));


@Override
public void onConnected(@Nullable Bundle bundle) 
    getCurrentLocation();



@Override
public void onConnectionSuspended(int i) 



@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) 



@Override
public void onMapLongClick(LatLng latLng) 

    mMap.clear();
    mMap.addMarker(new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.mipmap.tiltpink)).position(latLng).draggable(true).title("This is my loc"));



@Override
public void onMarkerDragStart(Marker marker) 



@Override
public void onMarkerDrag(Marker marker) 



@Override
public void onMarkerDragEnd(Marker marker) 

    vlatitude = marker.getPosition().latitude;
    vlongitude = marker.getPosition().longitude;
    moveMap();



@Override
public void onClick(View view) 

    if (view == getButton)
        getCurrentLocation();
        moveMap();
    

【问题讨论】：

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【参考方案1】：

这个方法解决了问题。

 @Override
public void onLocationChanged(Location location) 
    if (location != null) 
        LatLng latLang = new LatLng(location.getLatitude(),
                location.getLongitude());
        animateCameraToMarker(latLang, false);
        setMarker(latLang);
        getAddressFromLocation(latLang, source);
    

   // stop location updates
    if (mGoogleApiClient != null) 
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);