java - 从内联覆盖方法访问实例

Question

我有来自第三方组件的类，我需要从 onTap 访问 poleMarker 但它为空，我无权访问它:

Marker poleMarker = new Marker(markerPoint,myBitmap),0,0) {
                    @Override
                    public boolean onTap(org.mapsforge.core.model.LatLong tapLatLong, Point layerXY, Point tapXY) 
                    {
                        // poleMarker is null here and I need it :)
                        lastTappedMarker = poleMarker;
                    }
}

Answer 1

您不能在以不同方法定义的内部类中引用非最终变量(这是编译器错误，我自己无法更好地解释它...)。您应该为此使用 this。

Marker poleMarker = new Marker(markerPoint,myBitmap),0,0) {
    @Override
    public boolean onTap(org.mapsforge.core.model.LatLong tapLatLong, Point layerXY, Point tapXY) 
    {
         lastTappedMarker = this;
    }
}