如何使用FusedLocationProviderClient获取GoogleMap中的当前位置

Question

我想定期(比如每2分钟)当前位置更新为这个我下面的官方文档,我写了这个代码,但它不会给当前的位置即使在我传递requestLocationUpdates LocationRequest对象指定每两分钟更新( ),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

这与我在这里的其他答案类似,更新后使用最近推出的FusedLocationProviderClient类.

要将FusedLocationProviderClient与Google Map结合使用,请执行以下操作:

1. 等到谷歌地图准备好了

2. 如果需要,在运行时请求位置权限

3. 授予权限后请求位置更新

4. 获取用户的位置后更新Google Map

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

dependencies {
      implementation 'com.google.android.gms:play-services-maps:17.0.0'
      implementation 'com.google.android.gms:play-services-location:17.0.0'
    //........
}

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.从文档:

注意:建议使用版本11.6.0或更高版本的Google Play服务,其中包括此类的错误修复.

这是完整的Activity类:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

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

    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 onlocation 更改...