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当用户接近目的地时，如何使用接近警报通知用户？
有人可以给我一个示例代码的链接，因为我从来没有使用过这样的应用程序。
我需要尽快解决
提前致谢
I need to sort an ArrayList and i can't use Collections.sort(), because Google App Engine's Java runtime environment doesn't support it. How can I do? Thank