使用运行时调用的抽象方法的值

Question

我正在尝试使用来自 here 的 MyLocation 类。在下面的代码中，我需要在实例化 MyLocation 的类中的任何位置访问变量 currentLat 和 currentLon。我不知道如何访问currentLat 和currentLon 的值

LocationResult locationResult = new LocationResult(){ @Override public void gotLocation(Location location){ currentLat = location.getLatitude(); currentLon = location.getLongitude(); }; } MyLocation myLocation = new MyLocation(); myLocation.getLocation(this, locationResult);

假设我想在这里

Double x =currentLoc;

我如何得到它？任何帮助将不胜感激

Answer 1

使用您自己的扩展/实现 LocationResult 类/接口并像这样添加 getter 来代替匿名类

    class MyLocationResult extends/implments LocationResult{
    double currentLat;
    double currentLon;

    @Override 
    public void gotLocation(Location location){ 
        currentLat = location.getLatitude(); 
        currentLon = location.getLongitude(); 
    };
    public double getCurrentLat(){
       return currentLat;
    }
    public double getCurrentLon (){
       return currentLon ;
    }
}

那你就可以写了

MyLocationResult locationResult = new MyLocationResult();
MyLocation myLocation = new MyLocation(); 
myLocation.getLocation(this, locationResult);

只要你需要 currentLat 或 currentLon 你就可以写

locationResult.getCurrentLat();

Answer 2

您可以对变量使用static 修饰符并在全局范围内定义它们。

public static double currentLat; // defined globally...
public static double currentLon;

LocationResult locationResult = new LocationResult(){
   @Override
      public void  gotLocation(Location location){
      currentLat =location.getLatitude(); // assuming getLatitude() returns double or int
      currentLon = location.getLongitude();
    };
}
MyLocation myLocation = new MyLocation();
myLocation.getLocation(this, locationResult);

现在您可以在任何地方访问它们

double x =currentLon;
double y =currentLat;