得到的当前位置（GPS /无线） [英] get the current location (gps/wifi)

问题描述

我试图用它像这样把我的位置：

I'm trying to get my location using it like this:

LocationManager myLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

Criteria criteria = new Criteria(); 
criteria.setAccuracy(Criteria.ACCURACY_FINE); 
criteria.setAltitudeRequired(false); 
criteria.setBearingRequired(false); 
criteria.setCostAllowed(true); 
criteria.setPowerRequirement(Criteria.POWER_LOW); 

String provider = myLocationManager.getBestProvider(criteria,true); 

if (provider != null) { 
    //there is a provider
    myLocationManager.requestLocationUpdates(provider, 10L, 500.0f, (LocationListener) mainContext);
    Location myCurLocation = myLocationManager.getLastKnownLocation(provider); 
            //here i'm trying to get some data from the
            //myCurLocation but 
            //myCurLocation == NULL
}

但myCurLocation总是== NULL

but the myCurLocation is always == NULL

我在做什么错了？

推荐答案

到调用getLastKnownLocation（）不块 - 这意味着它会返回无效 - 所以你可能想看看传递的 LocationListener的 到<一个href=\"http://developer.android.com/intl/de/reference/android/location/LocationManager.html#requestLocationUpdates%28java.lang.String,%20long,%20float,%20android.app.PendingIntent%29\"相对=nofollow> requestLocationUpdates（）方法相反，这会给你的位置的异步更新。

The call to getLastKnownLocation() doesn't block - which means it will return null if no position is currently available - so you probably want to have a look at passing a LocationListener to the requestLocationUpdates() method instead, which will give you asynchronous updates of your location.

看一看<一个href=\"http://stackoverflow.com/questions/2227292/how-to-get-latitude-and-longitude-of-the-mobiledevice-in-android\">this问题为使用 LocationListener的 的例子。

Have a look at this question for an example of using a LocationListener.

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