Android中使用地图之地址（字符串类型）转换经纬度

项目中用到根据距离排序，看百度地图帮助文档，试了几种方法都没有得以实现，最后通过网页版的json的以实现地址如下，传地址值即可

http://maps.google.com/maps/api/geocode/json?address=%E5%8C%97%E4%BA%AC%E9%82%AE%E7%94%B5%E5%A4%A7%E5%AD%A6&sensor=false

public JSONObject getLocationInfo(String address) {
        // 发送json请求获取地址的json对象
        HttpGet httpGet = new HttpGet("http://maps.google."
                + "com/maps/api/geocode/json?address=" + address
                + "ka&sensor=false");
        HttpClient client = new DefaultHttpClient();
        HttpResponse response;
        StringBuilder stringBuilder = new StringBuilder();

        try {
            response = client.execute(httpGet);
            HttpEntity entity = response.getEntity();
            InputStream stream = entity.getContent();
            int b;
            while ((b = stream.read()) != -1) {
                stringBuilder.append((char) b);
            }
        } catch (ClientProtocolException e) {
        } catch (IOException e) {
        }

        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject = new JSONObject(stringBuilder.toString());
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return jsonObject;
    }

    public GeoPoint getGeoPoint(JSONObject jsonObject) {
        // 解析json获取经纬度信息
        Double lon = new Double(0);
        Double lat = new Double(0);

        try {
            lon = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                    .getJSONObject("geometry").getJSONObject("location")
                    .getDouble("lng");

            lat = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                    .getJSONObject("geometry").getJSONObject("location")
                    .getDouble("lat");

        } catch (JSONException e) {
            e.printStackTrace();
        }
        return new GeoPoint((int) (lat * 1E6), (int) (lon * 1E6));
    }