java - requestLocationUpdates 在错误的时间生成位置

Question

我正在尝试从 2 个不同的提供商处获取位置信息:网络和 GPS。

我在 requestLocationUpdates 中使用 minTime 1 分钟和 minDistance 300 米。使用这些参数，我不希望每分钟(每个提供商)获得超过一个更新。问题是，我获取更新的频率更高(每分钟超过 1 个)。为什么？

下面是一些代码来演示:

    mLocationManager.removeUpdates(listener);
    if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) 
        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, TEN_SECONDS*6, TEN_METERS*30, listener);

    if (mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) 
        mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, TEN_SECONDS*6, TEN_METERS*30, listener);

这是监听器:

private final LocationListener listener = new LocationListener() 
{

    @Override
    public void onLocationChanged(Location location) 
    {
        if(location.getProvider().equals(LocationManager.NETWORK_PROVIDER))
            updateUILocation(location,LocationService.this.gpsLocation);
        else
            updateUILocation(LocationService.this.networkLocation, location);   
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
};

更新UILocation:

private void updateUILocation(Location networkLocation,Location gpsLocation) 
{
    Location location = null;
    if(gpsLocation == null || gpsLocation.getAccuracy() > 800)
    {
        if(!(networkLocation == null || networkLocation.getAccuracy() > 800))
            location = networkLocation;
    }
    else
        if(networkLocation == null)
        {
            if(gpsLocation.getAccuracy() < 800)
                location = gpsLocation;
        }
        else
            if(gpsLocation.getAccuracy() < networkLocation.getAccuracy() && gpsLocation.getAccuracy() < 500)
                location = gpsLocation;
            else
                if(networkLocation.getAccuracy() < 800)
                    location = networkLocation;
    if(location!=null)
    {
         if (mGeocoderAvailable) 
            doReverseGeocoding(location);
    }

    // Bypass reverse-geocoding only if the Geocoder service is available on the device.

}

doReverseGeocoding 将位置转换为文本并调用处理程序:

    mHandler = new Handler() 
    {
        public void handleMessage(Message msg) 
        {
            if(msg.what == UPDATE_ADDRESS) // msg.what == 1
            {
                LocationService.this.address = (String) msg.obj;
                new SendLocation(LocationService.this.id,(String)msg.obj); //send the location to the db
                LocationService.this.gpsLocation = null; //reset gps value
                LocationService.this.networkLocation = null; //reset network value
            }
        }
    };

我在开车时测试了这个应用程序(这意味着 minDistance 参数不是一个因素)并且我每分钟收到超过 1 个位置更新。

以下是我在测试时收到的位置(请忽略这些位置，因为它是希伯来语，只需查找时间):http://imrip.interhost.co.il/

Answer 1

"The minTime is 1 minute and the minDistance is 300 meter. With those parameters I never should get 2 locations in less then 1 minute..."

这根本不是真的，无论如何都不是 pre-JellyBean。

http://developer.android.com/reference/android/location/LocationManager.html

Prior to Jellybean, the minTime parameter was only a hint, and some location provider implementations ignored it. From Jellybean and onwards it is mandatory for Android compatible devices to observe both the minTime and minDistance parameters.

在 JB 之前，您可以获得比您指定的最短时间更频繁的更新，尤其是在 GPS 接收信号不佳的情况下。有关详细信息，请参阅此答案:

requestLocationUpdates interval in Android