Question

我尝试使用当前位置在MapActivity上设置标记。如果我使用模拟器，地图上没有任何标记。如果我使用移动设备（API 24），活动会在没有标记的情况下短时间启动，然后应用程序崩溃。谢谢你的帮助。

networkx

Answer 1

你应该在onMapReady中调用get location

从onCreate中删除获取位置的所有逻辑，并在onMapReady中添加以下代码

  @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        if (mMap!=null){
            Log.d(TAG, "onMapReady: Map is "+mMap);
        }else {
            Log.d(TAG, "onMapReady: Map is not "+mMap);
        }
        mMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener() {
            @Override
            public boolean onMyLocationButtonClick() {
//                Toast.makeText(getActivity(), "Map button click"+mMap.getMyLocation().getLongitude(), Toast.LENGTH_SHORT).show();

                try {
                    displayLocationSettingsRequest(getContext());
                    latLngs=new LatLng(mMap.getMyLocation().getLatitude(),mMap.getMyLocation().getLongitude());
                    setLocationName(latLngs);
                } catch (Exception e) {
                    e.printStackTrace();
                    Log.d(TAG, "onMyLocationButtonClick: "+e);
                }

                //check permission
                return false;
            }
        });
        markerOptions=new MarkerOptions().position(new LatLng(-34, 151));
        mMarker=mMap.addMarker(markerOptions);
}

Answer 2

检查此代码是否适用于我

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_map);
    //buildGoogleApiClient();

    // 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);

}


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

    // Add a marker in Sydney and move the camera
    mMap.setMyLocationEnabled(true);

    //add this here:
    buildGoogleApiClient();

    //LatLng loc = new LatLng(lat, lng);
    //mMap.addMarker(new MarkerOptions().position(loc).title("New Marker"));
    //mMap.moveCamera(CameraUpdateFactory.newLatLng(loc));
}

@Override
public void onConnected(Bundle bundle) {
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
            mGoogleApiClient);
    if (mLastLocation != null) {
        lat = mLastLocation.getLatitude();
        lng = mLastLocation.getLongitude();

        LatLng loc = new LatLng(lat, lng);
        mMap.addMarker(new MarkerOptions().position(loc).title("New Marker"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(loc));
    }
}

Android Studio - 当前位置 - Google Map

2 个答案: