android - LocationServices.FusedLocationApi.requestLocationUpdates 永远不会被调用

Question

我没有使用 LocationManager，而是使用 LocationServices 方法来获取当前的 gps 位置和位置更新。

这是代码:

public void onConnected(@Nullable Bundle bundle) {
    mLocationRequest = new LocationRequest();//PRIORITY_BALANCED_POWER_ACCURACY
    mLocationRequest.setInterval(1000*30*1);
    mLocationRequest.setFastestInterval(1000*30*1);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_FINE_LOCATION)
            == PackageManager.PERMISSION_GRANTED) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest,this);
    }
}
public void onLocationChanged(Location location) { mLastLocation = location;
        if (mCurrLocationMarker != null)
        {
            mCurrLocationMarker.remove();
        }
    //Place current location marker
     latLng = new LatLng(location.getLatitude(), location.getLongitude());
     lat= location.getLatitude();
     log=location.getLongitude();
     trim_check_location_change(lat,log);
     MarkerOptions markerOptions = new MarkerOptions();
     markerOptions.position(latLng);
     markerOptions.title(""+s);
     markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
     mCurrLocationMarker = mMap.addMarker(markerOptions);
     //move map camera
     mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
     CurrentLocation = latLng;

当我从一个地方移动到另一个地方时，蓝色标记会相应地移动。但是永远不会调用 onlocationchanged 方法。

Answer 1

我在这里开发了融合位置 api 演示应用程序和实用程序包。

General Utilities

如果对您有用，请尝试一下。要使用融合位置 api 获取位置，您只需编写以下代码 fragment ...

new LocationHandler(this)
    .setLocationListener(new LocationListener() {
    @Override
    public void onLocationChanged(Location location) {
        // Get the best known location
    }
}).start();

如果您想自定义它，只需在此处找到文档...

https://github.com/abhishek-tm/general-utilities-android/wiki/Location-Handler

更新

我已经根据你的需要写了一个示例代码，试试这个...

import android.content.Intent;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;

import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
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.LatLng;
import com.google.android.gms.maps.model.Marker;

import in.teramatrix.utilities.service.LocationHandler;
import in.teramatrix.utilities.util.MapUtils;

/**
 * Lets see how to use utilities module by implementing location listener.
 *
 * @author Khan
 */

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, LocationListener {

    private GoogleMap map;
    private Marker marker;
    private LocationHandler locationHandler;

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

        // Obtaining an instance of map
        FragmentManager manager = getSupportFragmentManager();
        SupportMapFragment mapFragment = (SupportMapFragment) manager.findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        this.locationHandler = new LocationHandler(this)
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                .setInterval(5000)
                .setFastestInterval(10000)
                .setLocationListener(this);
    }

    @Override
    public void onMapReady(GoogleMap map) {
        this.map = map;
        this.locationHandler.start();
    }

    @Override
    public void onLocationChanged(Location location) {
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        if (marker == null) {
            marker = MapUtils.addMarker(map, latLng, R.drawable.ic_current_location);
            map.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 14), 500, null);
        } else {
            marker.setPosition(latLng);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (locationHandler != null) {
            locationHandler.stop();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == LocationHandler.REQUEST_LOCATION) {
            locationHandler.start();
        }
    }
}

希望对你有所帮助。