Question

我使用了下面的代码。它工作正常，但在某些设备，如Redme，华硕没有得到准确的位置。它显示我离我20公里以外的当前位置aprox。没有问题的地方有问题有人有想法请分享想法。谢谢提前。

public class Currentlocation extends Service implements LocationListener {

private final Context mContext;

// flag for GPS status
boolean isGPSEnabled = false;

// flag for network status
boolean isNetworkEnabled = false;

// flag for GPS status
public boolean canGetLocation = false;

Location location; // location
double latitude; // latitude
double longitude; // longitude

// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;

SetOnLocationFoundListner OLF;

public interface SetOnLocationFoundListner {
    public void onLocationFound(Location location, boolean getLocRegularly, GoogleMap gmap);
}

public Currentlocation(Context context) {
    this.mContext = context;
    getLocation();
}

public Location getLocation() {
    try {
        locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

        // getting GPS status
        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

        // getting network status
        isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isGPSEnabled && !isNetworkEnabled) {
            // no network provider is enabled
        } else {
            this.canGetLocation = true;
            // First get location from Network Provider
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network");
                if (locationManager != null) {
                    location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
            // if GPS Enabled get lat/long using GPS Services
            if (isGPSEnabled) {
                if (location == null) {
                    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("GPS Enabled", "GPS Enabled");
                    if (locationManager != null) {
                        location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return location;
}

/**
 * Stop using GPS listener Calling this function will stop using GPS in your
 * app
 */
public void stopUsingGPS() {
    if (locationManager != null) {
        locationManager.removeUpdates(Currentlocation.this);
    }
}

/**
 * Function to get latitude
 */
public double getLatitude() {
    if (location != null) {
        latitude = location.getLatitude();
    }

    // return latitude
    return latitude;
}

/**
 * Function to get longitude
 */
public double getLongitude() {
    if (location != null) {
        longitude = location.getLongitude();
    }

    // return longitude
    return longitude;
}

/**
 * Function to check GPS/wifi enabled
 *
 * @return boolean
 */
public boolean canGetLocation() {
    return this.canGetLocation;
}

@Override
public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub

}

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}

/**
 * Function to show settings alert dialog On pressing Settings button will
 * lauch Settings Options
 */

}

Answer 1

您不能指望手机始终没有有效的＆＃34;最后已知的位置＆＃34;也不以微秒为单位定义其位置。

您首先在requestLocationUpdates()之后立即致电getLastKnownLocation()。电话没有时间确定/更新最后的已知位置＆＃34;。除此之外，当您拨打requestLocationUpdates()时，您总是会一次又一次地拨打getLocation()。当您想要开始接收位置更新时，只需调用一次。

只需订阅一次接收位置更新，并始终获得稍有延迟的回调中的最新位置。您已经拥有空onLocationChanged()方法。这是回调方法。只需将其设置为处理位置更新。

如果您不希望收到removeUpdates()回调中的新鲜且最新的位置，您当然可以致电removeLocationUpdates()或onLocationChanged()任何进一步的更新。

一些有用的Stackoverflow讨论：

How to get location that isn't out of date?

Android: getLastKnownLocation out-of-date - how to force location refresh?

Android - Reliably getting the current location

没有得到一些Android手机准确的位置

1 个答案: