网络和GPS提供商之间切换 [英] Switching between network and GPS provider
问题描述
我想实现一个LocationListener的，将根据可用性网络和GPS提供商之间进行切换。
I want to implement a locationListener which will switch between network and GPS providers based on availability.
例如，如果GPS未启用，我希望它使用网络，但只要GPS是那么我希望它停止监听来自网络位置更新，并开始从GPS的听着。
For example if GPS is not enabled I want it to use network but as soon as GPS is on then I want it to stop listening for location updates from network and start listening from GPS.
同样地，我希望它开始监听来自网络的更新，一旦GPS被关闭。
Similarly I want it to start listening for updates from network as soon as GPS is switched off.
这可能吗？
Subquestion
时的GPS一样快，网络在提供位置锁定？
Is GPS as fast as network in providing a location fix?
推荐答案
当然，你只得到了供应商的网络和GPS，并通过任何你想 locationManager.requestLocationUpdates（）。
Sure, you just get the providers for the network and GPS and pass whichever you want to locationManager.requestLocationUpdates().
当你想停止收听到一定的提供商，呼叫 locationManager.removeUpdates（）与您 locationManager.requestLocationUpdates指定的侦听器对象（ ）。
When you want to stop listening to a certain provider, call locationManager.removeUpdates() with the listener object you specified in locationManager.requestLocationUpdates().
网络：
Criteria crit = new Criteria();
crit.setPowerRequirement(Criteria.POWER_LOW);
crit.setAccuracy(Criteria.ACCURACY_COARSE);
String provider = locationManager.getBestProvider(crit, false);
GPS：
Criteria crit2 = new Criteria();
crit2.setAccuracy(Criteria.ACCURACY_FINE);
provider2 = locationManager.getBestProvider(crit2, false);
您可以使用<一个href="http://developer.android.com/reference/android/location/LocationManager.html#isProviderEnabled%28java.lang.String%29">LocationManager.isProviderEnabled()文档，查看相应的供应商已启用/禁用。有一个在LocationManager文档提供更多的信息。
You can use LocationManager.isProviderEnabled() doc to see if the appropriate provider is enabled/disabled. There's more info available in the LocationManager docs.
GPS是不是网络通常要慢得多，因为你必须找到3+遥远的卫星等。
GPS is usually much slower than network since you have to find 3+ far-away satellites, etc.
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