LocationManager的位置，在Android中返回null [英] LocationManager's location in Android returns null

问题描述

我在测试设备​​上我的Andr​​oid应用程序，当我用它总是失败

I'm testing my Android app on a device, and it always fails when I use

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

不过，如果我用NETWORK_PROVIDER代替GPS_PROVIDER，它的工作原理。该currentLocation返回null。

However, if I use NETWORK_PROVIDER instead of GPS_PROVIDER, it works. The currentLocation returns null.

我该如何处理呢？有没有什么具体的，我需要把我的LocationListener的？

How can I handle this? Is there anything specific I need to put in my locationListener?

谢谢！

推荐答案

GPS_PROVIDER可能无法在有限的地方工作，想在房子里或类似这样的东西。如果GPS提供商给空位置，然后使用网络供应商作为一个替代方案，虽然其准确度不那么高，您应该编写一次以这样的方式。 这里还有另外一个问题。您的code应该如下：

GPS_PROVIDER may not work in bounded place, suppose inside a house or something like this. You should program it in such a way that if gps provider gives null location then you use network provider as a alternative although its accuracy is not so high. Here there is another issue. Your code should be as follows:

     if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)
{
     locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
    currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}

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