Android定位功能运行异常：定位结果不准确（附代码片段）

Hey there! Let's work through that inaccurate location problem you're dealing with. I notice you're using Google Maps alongside a custom GPSTracker and LocationManager—here are practical fixes to get your coordinates much more precise:

By default, your app might be relying on network-based location (which uses Wi-Fi/cell towers and is less accurate). Make sure you prioritize GPS (satellite-based) first, with network as a fallback:

// Request high-precision GPS updates (adjust time/distance thresholds as needed)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, yourLocationListener);
// Fallback to network location if GPS isn't available
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 5000, 10, yourLocationListener);

Also, add a check in your GPSTracker to see if GPS is enabled—if not, prompt the user to turn it on via system settings.

Every Location object has an getAccuracy() method that returns accuracy in meters (smaller = better). Ignore readings that are too imprecise:

@Override
public void onLocationChanged(Location location) {
    // Only use locations with accuracy within 50 meters (adjust this threshold as needed)
    if (location.getAccuracy() < 50) {
        latitude = location.getLatitude();
        longitude = location.getLongitude();
        // Update your map marker or camera position here
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude, longitude), 16));
    }
}

Instead of using LocationManager directly, Google's Fused Location Provider automatically combines GPS, network, and sensor data for better accuracy and efficiency. Here's a quick implementation snippet:

private FusedLocationProviderClient fusedLocationClient;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maaaap);
    fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

    // First, check for location permissions (critical for Android 6.0+)
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // Request ACCESS_FINE_LOCATION permission here
        return;
    }

    // Get the most recent accurate location
    fusedLocationClient.getLastLocation()
        .addOnSuccessListener(this, location -> {
            if (location != null) {
                // Validate accuracy before using the location
                if (location.getAccuracy() < 50) {
                    double currentLat = location.getLatitude();
                    double currentLng = location.getLongitude();
                    // Update your map with the precise location
                    mMap.addMarker(new MarkerOptions().position(new LatLng(currentLat, currentLng)).title("My Location"));
                    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(currentLat, currentLng), 16));
                }
            }
        });
}

Make sure your AndroidManifest.xml has the right permissions declared:

<!-- Required for high-precision GPS -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<!-- Fallback for low-precision network location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<!-- For Android 12+, add this if you need background location updates -->
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

Don't forget to request these permissions at runtime—Android 6.0+ requires explicit user consent.

GPS can take a few seconds to lock onto satellites. Avoid using the first location reading immediately; instead, wait until the accuracy drops to your desired threshold (like <50 meters) before updating your map. You can add a counter or a timeout in your location listener to handle this.

内容的提问来源于stack exchange，提问作者Ouertani Saiid