即使设备在同一个地方，Android Google Maps API GPS 位置也会发生变化

Question

我正在为我的应用程序使用 Google Maps API。即使设备在同一个地方，我的 GPS 位置也会发生变化，据说该位置每 6 秒更新一次，因此它会不断更新，但每次更新时它也会移动一点，有时甚至移动很多。我的代码如下。我还将添加屏幕截图。

package b.a.location_tracker;

import android.graphics.Color;
import android.location.Location;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
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 com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;


public class Map extends FragmentActivity implements OnMapReadyCallback, LocationListener, GoogleApiClient.ConnectionCallbacks {

private GoogleMap mMap;
Marker m;
private GoogleApiClient mGoogleApiClient;

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

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

    this.buildGoogleApiClient();

    mGoogleApiClient.connect();

}

private synchronized void buildGoogleApiClient() {
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this).addApi(LocationServices.API)
            .build();
}

@Override
public void onMapReady(GoogleMap googleMap) {

    mMap = googleMap;
    LatLng sydney = new LatLng(28.6139, 77.2090);
    m=mMap.addMarker(new MarkerOptions().position(sydney).title("Delhi City"));
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 20));
}

@Override
public void onConnected(Bundle bundle) {
    LocationRequest mLocationRequest = createLocationRequest();
    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (LocationListener) this);

}

@Override
public void onConnectionSuspended(int i) {
    Log.d("TAG", "Connection to Google API suspended");

}

private LocationRequest createLocationRequest() {
    LocationRequest mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(6000);
    mLocationRequest.setFastestInterval(1000);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    return mLocationRequest;
}

    @Override
public void onLocationChanged(Location location) {

    LatLng sydney = new LatLng(location.getLatitude(), location.getLongitude());
        LatLng a=m.getPosition();
        m.remove();
        m=mMap.addMarker(new MarkerOptions().position(sydney).title("Your Location"));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, mMap.getCameraPosition().zoom));
        Polyline line = mMap.addPolyline(new PolylineOptions().add(a,sydney).width(5).color(Color.RED));

}

请记住我的手机在同一个地方，因此它不应该移动。

This is a screenshot of the app

Answer 1

您是否尝试将 minDisplacementDistance 添加到您的 LocationRequest 中？

private LocationRequest createLocationRequest() {
    LocationRequest mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(6000);
    mLocationRequest.setFastestInterval(1000);
    mLocationRequest.setSmallestDisplacement(200); 
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    return mLocationRequest;
} 

如果您将设置此参数(默认情况下它等于 0)，如果您的 GPS 找到的新位置在先前找到的位置的 200 米半径范围内，则不会每次调用 LocationChanged 监听器。

现在，您的 onLocationChange 监听器每 6 秒调用一次，最小距离等于 0。由于 GPS 并非 100% 正确，您将获得许多不同的位置。将 smallestDisplacement 更改为更高后，将不会经常调用它。