Question

我正在为我的应用程序使用Google Maps API。我的GPS位置即使在设备位于同一个地方时也会发生变化，据说该位置每6秒更新一次，因此它会不断更新，但每次更新时也会移动一点，有时甚至很多。我的代码如下。我还会添加屏幕截图。

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不应该移动。

This is a screenshot of the app

Answer 1

您是否尝试将minDisplacementDistance添加到LocationRequest？

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），则每次GPS查找的新位置位于前方找到位置的200米范围内时，将不会调用LocationChanged侦听器。

现在你的onLocationChange监听器每6秒调用一次，最小距离等于0.由于GPS不是100％正确，你会得到很多不同的位置。将smallestDisplacement更改为更高版本后，将不会经常调用。

Answer 2

有时由于精度设置较低，数据将从Wifi网络接收。检查Android手机上的设置/位置/使用无线网络复选框。

Answer 3

从代码中删除这两行：

mLocationRequest.setInterval(6000);
mLocationRequest.setFastestInterval(1000);

Answer 4

您是否尝试过mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);

当我使用LocationRequest.PRIORITY_HIGH_ACCURACY时，Gps始终在使用并始终在建筑物中进行更改。我改变了准确度，然后改变了位置。

你可以看看这个：

/*
    Priority                update interval      Battery drain per hour (%)     Accuracy
    HIGH_ACCURACY           5 seconds                   7.25%                   ~10 meters
    BALANCED_POWER          20 seconds                  0.6%                    ~40 meters
    NO_POWER                N/A                         small                   ~1 mile

*/

使用：

public static void createLocationRequest() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(UPDATE_INTERVAL);
    mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
    mLocationRequest.setSmallestDisplacement(DISPLACEMENT);
}

private static int UPDATE_INTERVAL = 20000; // 20 second
private static int FASTEST_INTERVAL = 10000; // 10 second
private static int DISPLACEMENT = 50; // minimum change to get location

即使设备位于同一位置，Android Google Maps API GPS位置也会发生变化

4 个答案: