Question

我想定期（比如说每2分钟）当前的位置更新为此我正在遵循官方文档，我编写了这段代码，但它没有每两分钟给出当前位置更新，即使在我正在通过的LocationRequest对象中指定在requestLocationUpdates（）中，这里是代码：

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
    GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{

private FusedLocationProviderClient FusedLocationClient;
private GoogleApiClient mGoogleApiClient;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    if (mGoogleApiClient == null) {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

 SupportMapFragment map = 
  getSupportFragmentManager().findFragmentById(R.id.map));

  map.getMapAsync(this);

  FusedLocationClient LocationServices.getFusedLocationProviderClient(this);
}


@Override
public void onConnected(Bundle bundle) {
    FusedLocationClient.getLastLocation()
            .addOnSuccessListener(this, new OnSuccessListener<Location>() {
                @Override
                public void onSuccess(Location location) {

                    if (location != null) {
                        Log.i("MainActivity ", "" + location.getLongitude()) 
                    }
                }
            });
FusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
FusedLocationClient.requestLocationUpdates(requestLocation(), 
new LocationCallback(){
        @Override
        public void onLocationResult(LocationResult locationResult) {
            for (Location location : locationResult.getLocations()) {
               Log.i("MainActivity ", "" + location.getLongitude());
               //not getting current location updates every 2 minutes
            }
        };

    },null);

}

@Override
public void onConnectionSuspended(int i) {}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {}

Answer 1

这与我的other answer here类似，已更新为使用最近推出的FusedLocationProviderClient类。

为了将FusedLocationProviderClient与Google Map结合使用：

等到谷歌地图准备就绪
如果需要，请在运行时请求位置权限
授予权限后请求位置更新
获取用户的位置后更新Google地图

首先确保您至少使用版本11的Google Play服务，因为旧版本没有FusedLocationProviderClient类（较新版本也可以使用）：

dependencies {
    compile 'com.google.android.gms:play-services-maps:11.6.0'
    compile 'com.google.android.gms:play-services-location:11.6.0'
    //........
}

请注意，FusedLocationProviderClient存在于版本11.0.2中，但由于初始实现中存在错误，建议您仅在11.6.0及更高版本上使用此类。来自文档：

注意：建议使用Google Play服务版本11.6.0或更高，包括此类的错误修复。

这是完整的Activity类：

public class MapsActivity extends AppCompatActivity
        implements OnMapReadyCallback {

    GoogleMap mGoogleMap;
    SupportMapFragment mapFrag;
    LocationRequest mLocationRequest;
    Location mLastLocation;
    Marker mCurrLocationMarker;
    FusedLocationProviderClient mFusedLocationClient;

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

        getSupportActionBar().setTitle("Map Location Activity");

        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

        mapFrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFrag.getMapAsync(this);
    }

    @Override
    public void onPause() {
        super.onPause();

        //stop location updates when Activity is no longer active
        if (mFusedLocationClient != null) {
            mFusedLocationClient.removeLocationUpdates(mLocationCallback);
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mGoogleMap = googleMap;
        mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(120000); // two minute interval
        mLocationRequest.setFastestInterval(120000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
                //Location Permission already granted
                mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
                mGoogleMap.setMyLocationEnabled(true);
            } else {
                //Request Location Permission
                checkLocationPermission();
            }
        }
        else {
            mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
            mGoogleMap.setMyLocationEnabled(true);
        }
    }

    LocationCallback mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            List<Location> locationList = locationResult.getLocations();
            if (locationList.size() > 0) {
                //The last location in the list is the newest
                Location location = locationList.get(locationList.size() - 1);
                Log.i("MapsActivity", "Location: " + location.getLatitude() + " " + location.getLongitude());
                mLastLocation = location;
                if (mCurrLocationMarker != null) {
                    mCurrLocationMarker.remove();
                }

                //Place current location marker
                LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
                MarkerOptions markerOptions = new MarkerOptions();
                markerOptions.position(latLng);
                markerOptions.title("Current Position");
                markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
                mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);

                //move map camera
                mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 11));
            }
        }
    };

    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
    private void checkLocationPermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)) {

                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                new AlertDialog.Builder(this)
                        .setTitle("Location Permission Needed")
                        .setMessage("This app needs the Location permission, please accept to use location functionality")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                //Prompt the user once explanation has been shown
                                ActivityCompat.requestPermissions(MapsActivity.this,
                                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                        MY_PERMISSIONS_REQUEST_LOCATION );
                            }
                        })
                        .create()
                        .show();


            } else {
                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSIONS_REQUEST_LOCATION );
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_LOCATION: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // location-related task you need to do.
                    if (ContextCompat.checkSelfPermission(this,
                            Manifest.permission.ACCESS_FINE_LOCATION)
                            == PackageManager.PERMISSION_GRANTED) {

                        mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
                        mGoogleMap.setMyLocationEnabled(true);
                    }

                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }
}

系统将提示用户接受位置权限：

该位置将在应用启动时更新，每两分钟更新一次：

Answer 2

 mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            super.onLocationResult(locationResult);
            currentLocation = locationResult.getLastLocation();

        }
    };

这项工作对我而言。

Answer 3

    private LocationRequest locationRequest;

    public class MapsActivity extends FragmentActivity implements LocationListener{

    locationRequest = new LocationRequest();
    locationRequest.setInterval(60 * 1000);
    locationRequest.setFastestInterval(15 * 1000);
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);


@Override
public void onLocationChanged(Location location) {

    latitude = location.getLatitude();
    longitude = location.getLongitude();

}

实施位置更改侦听器，您将能够覆盖已更改的位置...

Answer 4

为简单起见，请尝试使用此库https://github.com/mrmans0n/smart-location-lib。这将使用融合位置提供程序。

您只需输入此代码

SmartLocation.with(context).location(new LocationBasedOnActivityProvider(callback))
    .start(new OnLocationUpdatedListener() { ... });

如何使用FusedLocationProviderClient

4 个答案: