Android-Google Maps-LocationListener-在onLocationChanged上添加标记会使应用崩溃

概述我想要一个标记来显示我的当前位置.添加所需的所有权限.当我注释掉mMap.addMarker和mMap.moveCamera时,该应用程序正在运行并显示Googlemaps.如果我在代码中使用这两个之一,则该应用会在地图打开之前崩溃.我尝试删除不为null的标记,但这不能解决问题.你们知道我如何使该应用程序

我想要一个标记来显示我的当前位置.添加所需的所有权限.当我注释掉mMap.addMarker和mMap.moveCamera时,该应用程序正在运行并显示Googlemaps.如果我在代码中使用这两个之一,则该应用会在地图打开之前崩溃.

我尝试删除不为null的标记,但这不能解决问题.

你们知道我如何使该应用程序正常工作吗？

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, LocationListener {private GoogleMap mMap;private List<LatLng> fountain = null;private LocationManager locationManager;private double posLat;private double posLng;private LatLng position;private Marker mposition;protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_maps);    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()            .findFragmentByID(R.ID.map);    mapFragment.getMapAsync(this);    locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);    startGPS();}@OverrIDepublic voID onMapReady(GoogleMap GoogleMap) {    mMap = GoogleMap;    // Add a marker in Sydney and move the camera    LatLng sydney = new LatLng(48.16786112327462, 16.383984438313828);    mposition = mMap.addMarker(new MarkerOptions().position(sydney).Title("Your position").icon(BitmapDescriptorFactory.fromresource(R.drawable.location)));    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));}//--------------------------------------------GPS Listener---------------------------------------public voID startGPS() {    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) {        ActivityCompat.requestPermissions(this, new String[]{androID.Manifest.permission.ACCESS_FINE_LOCATION}, 5);    }    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 5, this);    onLocationChanged(locationManager.getLastKNownLocation(LocationManager.GPS_PROVIDER));}@OverrIDepublic voID onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {    switch (requestCode) {        case 5: {            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {            } else {                getDialog2("Keine Erlaubnis für GPS").show();            }        }    }}@OverrIDepublic voID onLocationChanged(Location location) {    posLat = location.getLatitude();    posLng = location.getLongitude();    position = new LatLng(posLat, posLng);    if (mposition != null) {        mposition.remove();    }    mposition = mMap.addMarker(new MarkerOptions().position(position).Title("Your position").            icon(BitmapDescriptorFactory.fromresource(R.drawable.location)));    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 11));}@OverrIDepublic voID onStatusChanged(String provIDer, int status, Bundle extras) {}@OverrIDepublic voID onProvIDerEnabled(String provIDer) {}@OverrIDepublic voID onProvIDerDisabled(String provIDer) {}

// —————————-辅助方法—————— —————————–

public Dialog getDialog2(String string) {    AlertDialog.Builder builder = new AlertDialog.Builder(this);    builder.setMessage(string);    builder.setPositivebutton("OK",            new DialogInterface.OnClickListener() {                @OverrIDe                public voID onClick(DialogInterface dialog, int which) {                    finish();                }            });    return builder.create();}public Dialog getDialog(String string) {    AlertDialog.Builder builder = new AlertDialog.Builder(this);    builder.setMessage(string);    builder.setPositivebutton("OK",            new DialogInterface.OnClickListener() {                @OverrIDe                public voID onClick(DialogInterface dialog, int which) {                    dialog.dismiss();                }            });    return builder.create();}

}

解决方法:

好的,我已经解决了问题.所以我在这里发布解决方案.

我已经在MapsActivity上实现了LocationListener接口,由于某种原因,它无法以这种方式工作.我可以检索地理坐标,但是只要我想移动相机或添加标记,应用就会在打开时崩溃.

我不知道为什么,但是：

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,3000、5,此)

我撤消了LocationListener的实现,只是在“,this”的位置创建了一个新的：

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 5, new LocationListener() {                    @OverrIDe                    public voID onLocationChanged(Location location) {                        posLat = location.getLatitude();                        posLng = location.getLongitude();                        position = new LatLng(posLat, posLng);                        if (mposition != null) {                            mposition.remove();                        }                        mposition = mMap.addMarker(new MarkerOptions().position(position).Title("Your position").                                icon(BitmapDescriptorFactory.fromresource(R.drawable.location)));                        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 11));                    }                    @OverrIDe                    public voID onStatusChanged(String provIDer, int status, Bundle extras) {                    }                    @OverrIDe                    public voID onProvIDerEnabled(String provIDer) {                    }                    @OverrIDe                    public voID onProvIDerDisabled(String provIDer) {                    }                }        );

这样,它可以毫无问题地工作.

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