Question

我正在创建一个应用以在地图上显示用户的位置。问题是，当调用方法requestLocationUpdates或removeUpdates时，我在LocationListener参数中收到错误。我知道这可能是由于导入了错误的文件，但我确实导入了com.google.android.gms.location.LocationListener。我做了我的研究，但真的找不到解决方案。我会把一些代码放在一边，这样可能有所帮助。谢谢你的帮助。

import com.google.android.gms.location.LocationListener;

import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends FragmentActivity  implements OnMapReadyCallback,LocationListener {



    private GoogleMap mMap;

    LocationManager locationManager;
    String provider;



    @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);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        provider = locationManager.getBestProvider(new Criteria(),false);

    }


    @Override
    public void onResume(){
        super.onResume();
        locationManager.requestLocationUpdates(provider,400,1,this);

    }


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

        // Add a marker in Sydney and move the camera
        LatLng cali = new LatLng(3.451234, -76.532694);
        mMap.moveCamera(CameraUpdateFactory.newLatLng(cali));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
    }

    @Override
    public void onLocationChanged(Location location) {

        Double lat = location.getAltitude();
        Double lng = location.getLongitude();

    }



    @Override
    protected void onPause(){
        super.onPause();
        locationManager.removeUpdates(this);
    }




}

正如我所说的那样，问题在于：

locationManager.requestLocationUpdates(provider,400,1,this);

和

locationManager.removeUpdates(this);

顺便说一句，如果我删除这两行并且只是显示地图和标记，那么代码没有问题。

Answer 1

更改，按行

import com.google.android.gms.location.LocationListener;

用

import android.location.LocationListener ;

Android - LocationListener无法在方法上定义“this”

1 个答案: