构造函数的GeoPoint（双，双）是不确定的。这有什么错呢？ [英] The constructor GeoPoint(double, double) is undefined. What's wrong with that?

问题描述

我有错误：构造的GeoPoint（双，双）是不确定的。为什么会这样呢？怎样做是正确的？据我所知有链接的所有必要的库和语法似乎是正确的。

 包com.fewpeople.geoplanner;进口android.app.Activity;
进口android.os.Bundle;进口com.google.android.maps.GeoPoint;
进口com.google.android.maps.MapActivity;
进口com.google.android.maps.MapController;
进口com.google.android.maps.MapView;公共类GeoplannerActivity延伸活动{
    / **当第一次创建活动调用。 * /
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;        最终的MapView mMapView =（图形页面）findViewById（R.id.mapview）;     MapController mMapController = mMapView.getController（）;     双X，Y;
     X = 60.113337;
     Y = 55.151317;     mMapController.animateTo（新的GeoPoint（X，Y​​））;     mMapController.setZoom（15）;    }    保护布尔isRouteDisplayed（）{
        返回false;
    }
}
 

解决方案

GeoPoint对象有两个整型是在微度COORDS。我用这个方法为简单：

  / **
 *一对坐标转换为GeoPoint对象
 *
 * @参数COORDS双重包含经度和纬度
 * @返回GeoPoint对象为同一COORDS
 * /
公共静态的GeoPoint coordinatesToGeoPoint（双[] coords）使用{
    如果（coords.length→2）{
        返回null;
    }
    如果（COORDS [0] == Double.NaN || COORDS [1] == Double.NaN）{
        返回null;
    }
    最终诠释纬度=（int）的（COORDS [0] * 1E6）;
    最终诠释经度=（int）的（COORDS [1] * 1E6）;
    返回新的GeoPoint（经度，纬度）;
}
 

另外，你的活动应该扩展MapActivity。

I am having error: "The constructor GeoPoint(double, double) is undefined". Why is it so? How to do it right? As I understand there are all necessary libraries linked and syntax seems to be right.

package com.fewpeople.geoplanner;

import android.app.Activity;
import android.os.Bundle;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;

public class GeoplannerActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final MapView mMapView = (MapView) findViewById(R.id.mapview);

     MapController mMapController = mMapView.getController();

     double x, y;
     x= 60.113337;
     y= 55.151317;

     mMapController.animateTo(new GeoPoint(x, y));

     mMapController.setZoom(15);

    }

    protected boolean isRouteDisplayed() {
        return false;
    }
}

解决方案

GeoPoint takes two integers that are coords in microdegrees. I use this method for simplicity:

/**
 * Converts a pair of coordinates to a GeoPoint
 * 
 * @param coords double containing latitude and longitude
 * @return GeoPoint for the same coords
 */
public static GeoPoint coordinatesToGeoPoint(double[] coords) {
    if (coords.length > 2) {
        return null;
    }
    if (coords[0] == Double.NaN || coords[1] == Double.NaN) {
        return null;
    }
    final int latitude = (int) (coords[0] * 1E6);
    final int longitude = (int) (coords[1] * 1E6);
    return new GeoPoint(latitude, longitude);
}

Also, your Activity should extend MapActivity.

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