getSystemService未定义为的getLocation类型

问题描述

我的GetURL定义您的网络供应商我的位置的方法，您可以发送code以下。

如果我定义了code片在我的主类的活动这工作得很好，但是当我想创建一个独立的类（例如的getLocation类），我不能用getSystemService方法，我在受收到错误（ getSystemService未定义用于的getLocation的类型）。有几个关于该主题的作品，但我不完全理解。

这是一个菜鸟的问题，以便考虑到这一点的同时回答:)谢谢你们。

 公共字符串的GetURL（）{
    LocationManager locationManager =（LocationManager）getSystemService（LOCATION_SERVICE）;
    标准标准=新标准（）;
    criteria.setAccuracy（Criteria.ACCURACY_FINE）;
    字符串locationProvider = LocationManager.NETWORK_PROVIDER;
    mostRecentLocation = locationManager.getLastKnownLocation（locationProvider）;
    如果（mostRecentLocation！= NULL）{
        双纬度= mostRecentLocation.getLatitude（）;
        双LNG = mostRecentLocation.getLongitude（）;
        currentLocation =纬度：+纬度+LNG：+ LNG;
        Log.e（所在地-------------，currentLocation +）;
    }
    返回currentLocation;
}
 

解决方案

该方法<$c$c>getSystemService()属于上下文类。

因此​​，如果要移动的getURL（）成为其他地方的实用方法，你需要传递一个上下文的对象，如当前的活动（因为它从上下文）。

例如：
Util.java

 公共静态字符串的getURL（上下文的背景下）{
    LocationManager LM =（LocationManager）
        context.getSystemService（Context.LOCATION_SERVICE）;

    // ...您现有的code ...
    返回currentLocation;
}
 

MyActivity.java

 公共无效的onCreate（）{
    // ...平常的东西......

    字符串URL =的getURL（本）;
}
 

I have GetURL method defined to find my location from network provider, you can send the code below.

If I define that code piece in my main class with Activity this works nicely but when I would like to create a seperate class (for instance GetLocation class), I cannot use getSystemService method and I receive error in subject (getSystemService is undefined for the type for GetLocation). There are couple of entries regarding this topic but I don't understand fully.

That's a rookie question so take this into account while answering :) Thanks guys.

public String GetURL () {
    LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    String locationProvider = LocationManager.NETWORK_PROVIDER;
    mostRecentLocation = locationManager.getLastKnownLocation(locationProvider);
    if(mostRecentLocation != null) {
        double lat = mostRecentLocation.getLatitude();
        double lng = mostRecentLocation.getLongitude();
        currentLocation = "Lat: " + lat + " Lng: " + lng;
        Log.e("LOCATION -------------", currentLocation + "");
    }
    return currentLocation;
}

解决方案

The method getSystemService() belongs to the Context class.

Therefore if you want to move getUrl() to become a utility method elsewhere, you need to pass in a Context object, such as the current Activity (as it inherits from Context).

For example:
Util.java

public static String getUrl(Context context) {
    LocationManager lm = (LocationManager) 
        context.getSystemService(Context.LOCATION_SERVICE);

    // ... your existing code ...
    return currentLocation;
}

MyActivity.java

public void onCreate() {
    // ... usual stuff ...

    String url = getUrl(this);
}

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