Android位置不正确 [英] Android location is inaccurate

查看：71 发布时间：2021/5/30 20:04:53 android location

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问题描述

我正在尝试获取当前用户的位置.我试图重构代码以获得更好的结果，但我一直在获得关于准确性的荒谬位置，它在900-600米之间.

I am trying to get the current user's location. I have tried to refactor my code to get better results but I just keep getting ridiculous locations in regard to the accuracy, it is between 900-600 meters.

如何获得更好的结果，以使其精确到50m以内?

How can I get a better result, so as to force it to an accuracy within 50m?

这是我的代码:

package com.agam.mapslocation;

import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;

public class MapsActivity extends Activity {

    private static final int ONE_MINUTE = 1000 * 60 * 1;

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

        final LocationManager locationManager = (LocationManager) this
                .getSystemService(Context.LOCATION_SERVICE);

        final EditText et = (EditText) findViewById(R.id.editText1);

        // Define a listener that responds to location updates
        LocationListener locationListener = new LocationListener() {
            public void onLocationChanged(Location l) {
                // Called when a new location is found by the network location
                // provider.
                Location gps = locationManager
                        .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                Location net = locationManager
                        .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                Location bestLocation = null;
                bestLocation = isBetterLocation(gps, net);
                bestLocation = isBetterLocation(bestLocation, l);
                if(bestLocation!=null)
                    displayLocation(et, bestLocation);
            }

            public void onStatusChanged(String provider, int status,
                    Bundle extras) {

            }

            public void onProviderEnabled(String provider) {
                if (provider.equals(LocationManager.GPS_PROVIDER)) {
                    et.setText("GPS ON!");
                }
            }

            public void onProviderDisabled(String provider) {
            }
        };

        // Register the listener with the Location Manager to receive location
        // updates
        locationManager.requestLocationUpdates(
                LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
                0, locationListener);
    }

    public static void displayLocation(View v, Location l) {
        ((EditText) v).setText(String.format(
                "Long:%s,\nLat:%s,\nAccu:%s,\nTime ago:%s,\nProvider:%s",
                l.getLongitude(), l.getLatitude(), l.getAccuracy(),
                new java.util.Date().getTime() - l.getTime(), l.getProvider()));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_maps, menu);
        return true;
    }

    /**
     * Determines whether one Location reading is better than the current
     * Location fix
     * 
     * @param location
     *            The new Location that you want to evaluate
     * @param currentBestLocation
     *            The current Location fix, to which you want to compare the new
     *            one
     */
    protected Location isBetterLocation(Location location,
            Location currentBestLocation) {
        if (currentBestLocation == null) {
            // A new location is always better than no location
            return location;
        }

        // Check whether the new location fix is newer or older
        long timeDelta = location.getTime() - currentBestLocation.getTime();
        boolean isSignificantlyNewer = timeDelta > ONE_MINUTE;
        boolean isSignificantlyOlder = timeDelta < -ONE_MINUTE;
        boolean isNewer = timeDelta > 0;

        // If it's been more than two minutes since the current location, use
        // the new location
        // because the user has likely moved
        if (isSignificantlyNewer) {
            return location;
            // If the new location is more than two minutes older, it must be
            // worse
        } else if (isSignificantlyOlder) {
            return currentBestLocation;
        }

        // Check whether the new location fix is more or less accurate
        int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation
                .getAccuracy());
        boolean isLessAccurate = accuracyDelta > 0;
        boolean isMoreAccurate = accuracyDelta < 0;
        boolean isSignificantlyLessAccurate = accuracyDelta > 200;

        // Check if the old and new location are from the same provider
        boolean isFromSameProvider = isSameProvider(location.getProvider(),
                currentBestLocation.getProvider());

        // Determine location quality using a combination of timeliness and
        // accuracy
        if (isMoreAccurate) {
            return location;
        } else if (isNewer && !isLessAccurate) {
            return location;
        } else if (isNewer && !isSignificantlyLessAccurate
                && isFromSameProvider) {
            return location;
        }
        return currentBestLocation;
    }

    /** Checks whether two providers are the same */
    private boolean isSameProvider(String provider1, String provider2) {
        if (provider1 == null) {
            return provider2 == null;
        }
        return provider1.equals(provider2);
    }
}

注意:我将重点放在静态位置，例如不要动，因为它可能有助于答案.

Note: I am putting emphasis on static location, e.g. not moving because it may help with the answers.

Android位置不正确 [英] Android location is inaccurate

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