问题描述
我正在尝试使用 GPS 获取设备的位置信息，但由于某种原因，有时会丢失两个坐标之一.
I am trying to get a device's location information using GPS, but for some reason one of the two coordinates is missing sometimes.
这是代码:
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
double longitude = location.getLongitude();
double latitude = location.getLatitude();
Log.d("LOCATION1", "Longitude: " + longitude);
Log.d("LOCATION2", "Latitude: " + latitude);
有时我确实得到了两个坐标，但并非总是如此，这让我想到了某处的某种延迟.发生这种情况时，有没有办法找出为什么 GPS 坐标丢失?
Sometimes I do get both coordinates, but not always, which makes me think about some kind of delay somewhere. Is there a way to find out why a GPS coordinate is missing when this happens?
推荐答案
因为 GPS 并不总是开启.getLastKnownLocation 将返回一个位置如果它知道一个并且它不是太陈旧.由于没有其他人在使用 GPS，它不知道其中之一.如果您需要位置，请 requestLocationUpdates 或 requestSingleUpdate，这将打开 GPS 并获取新位置.
Because the GPS isn't always on. getLastKnownLocation will return a location if it knows one and if it isn't too stale. Since nothing else was using the GPS, it doesn't know one. If you need a location, either requestLocationUpdates or requestSingleUpdate, which will turn on the GPS and get a new location.
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