Question

我是Android编程的初学者。我想创建包含双倍纬度和经度的位置对象，并使用纬度和经度作为输入设置LatLng值。

我现在遇到的问题是我创建了一个以纬度和经度为参数的对象，但LatLng似乎为null。（当我想使用LatLng值设置标记时，给出运行时错误）。在使用纬度和经度作为参数创建对象时，如何设置LatLng值？这是我的代码：

public class Location {
    int id;
    double latitude;
    double longitude;
    LatLng location;

    public Location() {}

    public Location(int id, double latitude, double longitude) {
        this.id = id;
        this.latitude = latitude;
        this.longitude = longitude;
        this.location = new LatLng(latitude, longitude);
    }

    public Location(double latitude, double longitude) {
        this.latitude = latitude;
        this.longitude = longitude;
        this.location = new LatLng(latitude, longitude);
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setLatitude(double latitude) {
        this.latitude = latitude;
    }

    public void setLongitude(double longitude) {
        this.longitude = longitude;
    }

    public void setLocation(LatLng location) {
        this.location = location;
    }

    public int getId() {
        return this.id;
    }

    public double getLatitude() {
        return this.latitude;
    }

    public double getLongitude() {
        return this.longitude;
    }

    public LatLng getLocation() {
        return this.location;
    }
}

Answer 1

改变这个对你有帮助。

public class Location {
int id;
double latitude;
double longitude;
LatLng location;

public Location() {}

public Location(int id, double latitude, double longitude) {
    this.id = id;
    this.latitude = latitude;
    this.longitude = longitude;

}

public Location(double latitude, double longitude) {
    this.latitude = latitude;
    this.longitude = longitude;
}

public void setId(int id) {
    this.id = id;
}

public void setLatitude(double latitude) {
    this.latitude = latitude;
}

public void setLongitude(double longitude) {
    this.longitude = longitude;
}

public void setLocation(LatLng location) {
    this.location = location;
}

public int getId() {
    return this.id;
}

public double getLatitude() {
    return this.latitude;
}

public double getLongitude() {
    return this.longitude;
}

public LatLng getLocation() {
    return new LatLng(latitude, longitude);
}
}

使用纬度和经度在构造函数中设置LatLng位置

1 个答案: