Android中如何调用google地图生成路线图

if (wodeweizhiPoint != null) {
if (wodeweizhiPoint.getLatitudeE6() != 0) {
float chufajingdu = (float) (wodeweizhiPoint.getLongitudeE6() / 1E6);
float chufaweidu = (float) (wodeweizhiPoint.getLatitudeE6() / 1E6);
float daodajingdu = (float) (AppConstant.PointZuoBiao.liangxiangDaoHangPoint.getLongitudeE6() / 1E6);
float daodaweidu = (float) (AppConstant.PointZuoBiao.liangxiangDaoHangPoint.getLatitudeE6() / 1E6);
// 标记一个点
// Intent i = new
// Intent(Intent.ACTION_VIEW,Uri.parse("http://ditu.google.cn/maps?hl=zh&mrt=loc&q=31.249351,121.45905"));

// 从哪到哪的路线
Intent i = new Intent(Intent.ACTION_VIEW,Uri.parse("http://ditu.google.cn/maps?f=d&source=s_d&saddr="
+ chufaweidu
+ ","
+ chufajingdu
+ "&daddr="
+ daodaweidu
+ ","
+ daodajingdu + "&hl=zh"));
//如果强制使用googlemap地图客户端打开，就加下面两句
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK& Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
i.setClassName("com.google.android.apps.maps","com.google.android.maps.MapsActivity");
startActivity(i);
}
} else {
AlertUtils.ToastAlert(mContext, “由于无法获取到您的位置，所以暂时无法提供导航”);
}