如何知道我的Android应用程序已经升级，以重置报警？
我注意到，当它设置该报警的应用程序已经升级了报警将被禁止。 是这样吗？
I noticed that an alarm is disabled when the application which sets this alarm has been upgraded. Is that true ?
到现在为止，我使用了共享preferences 与 FIRST_RUN 键，以便知道它的我的应用程序第一次运行。如果我不觉得这是关键，我能报警，并设置 FIRST_RUN 来假的，别的我什么也不做。
Until now, I used the SharedPreferences with a FIRST_RUN key in order to know if it's the first run of my application. If I don't find this key, I enable the alarm and set FIRST_RUN to false, else I do nothing.
但是，我也注意到，这些preferences保持完整的应用程序升级的！
But I noticed also that these preferences remain intact between app upgrade !
所以，在升级之后，该 FIRST_RUN 键已经是假的，所以我什么都不做，而我的报警需要激活。
So after an upgrade, the FIRST_RUN key is already false, so I do nothing while my alarm need to be enabled.
如何处理这种情况？
在此先感谢
我从来没有尝试这个自己，但如何创建一个的BroadcastReceiver 监听到ACTION_PACKAGE_REPLACED$c$c>意图是什么？
I've never tried this myself, but what about creating a BroadcastReceiver that listens to the ACTION_PACKAGE_REPLACED Intent?
我想过之前尝试这一点，但我不知道是否有鸡还是先有蛋的问题，或不（例如，莫非是意图在新升级的应用程序可以接收之前就被送进？）。值得一试，虽然。
I've thought about trying this before, but I'm not sure if there's a chicken-and-egg problem with it or not (e.g., does the Intent get sent before the new upgraded application can receive it?). Worth a try, though.