Android的转换CID位置坐标 [英] Android convert CID location to Coordinates

问题描述

我建立了一个Android应用程序，它可以处理来自谷歌地图份额的意图，并显示它的坐标。

I built an android app which can handle a share intent from Google Maps and show it's coordinates.

现在的问题是，他们发送的短网址，我去code与谷歌的网址shortner API，并在某些情况下，结果长的链接是这种类型的：<一href="http://maps.google.com/?cid=3635533832900933072&hl=en&gl=us">http://maps.google.com/?cid=3635533832900933072&hl=en&gl=us.

The problem is that they send a short url which I decode with Google's url shortner api and in some cases, the result long link is of this type: http://maps.google.com/?cid=3635533832900933072&hl=en&gl=us.

谁能帮助我如何获得coresponding坐标的CID = 3635533832900933072的

Can anyone help me on how to get the coresponding coordinates to "cid=3635533832900933072"

推荐答案

据我所知，没有公开的API从CID获得的位置。

As far as I know there is no public API to get the location from a cid.

但是，一种可能的解决方法是解析谷歌地图输出获得的纬度和经度（尽管它可能是脆性的，如果他们改变的结果格式）。

However, a possible workaround would be to parse the Google Maps output to obtain the latitude and longitude (though it may be brittle, if they change the result format).

（虽然URL包含输出= JSON ，它不是真正的JSON - 这就是为什么我分析它与子（）键，这样，而不是使用的JSONObject ）。的

(Although the url contains output=json, it's not actually json -- that's why I parse it with substring() and such instead of using JSONObject).

试试这个code：

public static LatLng getCidCoordinates(String cid)
{
    final String URL_FORMAT = "http://maps.google.com/maps?cid=%s&q=a&output=json"; 
    final String LATLNG_BEFORE = "viewport:{center:{";
    final String LATLNG_AFTER = "}";
    final String LATLNG_SEPARATOR = ",";
    final String LAT_PREFIX = "lat:";
    final String LNG_PREFIX = "lng:";

    try
    {
        HttpClient client = new DefaultHttpClient();
        HttpGet get = new HttpGet(String.format(URL_FORMAT, cid));
        HttpResponse response = client.execute(get);

        String text = EntityUtils.toString(response.getEntity(), "UTF-8");

        int startIndex = text.indexOf(LATLNG_BEFORE);
        if (startIndex == -1)
            return null;

        startIndex += LATLNG_BEFORE.length();
        int endIndex = text.indexOf(LATLNG_AFTER, startIndex);

        // Should be "lat:<number>,lng:<number>"
        String[] parts = text.substring(startIndex, endIndex).split(LATLNG_SEPARATOR);
        if (parts.length != 2)
            return null;

        if (parts[0].startsWith(LAT_PREFIX))
            parts[0] = parts[0].substring(LAT_PREFIX.length());
        else
            return null;

        if (parts[1].startsWith(LNG_PREFIX))
            parts[1] = parts[1].substring(LNG_PREFIX.length());
        else
            return null;

        return new LatLng(Double.parseDouble(parts[0]), Double.parseDouble(parts[1]));
    }
    catch (NumberFormatException e)
    {
        e.printStackTrace();
        return null;
    }
    catch (IOException e)
    {
        e.printStackTrace();
        return null;
    }
}

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