获取当前位置(gps/wifi)

Question

我正在尝试使用它来获取我的位置:

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

我究竟做错了什么？

Answer 1

调用getLastKnownLocation()不会阻止 - 这意味着null如果当前没有可用的位置它将返回- 所以你可能想看看传递LocationListener给requestLocationUpdates()方法,这将为你提供你的位置的异步更新.

看一下这个问题的一个例子LocationListener.