How to know my Android application has been upgraded in order to reset an alarm?

I noticed that an alarm is disabled when the application which sets this alarm has been upgraded. Is that true ?

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.

But I noticed also that these preferences remain intact between app upgrade !

So after an upgrade, the FIRST_RUN key is already false, so I do nothing while my alarm need to be enabled.

How to handle such case ?

Thanks in advance

Solution by Daniel Lew :

Need a receiver with the following lines in manifest :

<receiver android:name=".OnUpgradeReceiver">
  <intent-filter>
    <action android:name="android.intent.action.PACKAGE_REPLACED" />
    <data android:scheme="package" android:path="your.app.package" />
  </intent-filter>
</receiver>

android:path is used in order to prevent OnUpgradeReceiver to be triggered by any upgrade of any application.

I've never tried this myself, but what about creating a BroadcastReceiver that listens to the ACTION_PACKAGE_REPLACED Intent?

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.