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How does an application know if a package is added or removed?

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How does an application know if a package is added or removed?

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Whenever a package is added, an intent with PACKAGE_ADDED action is broadcast by the system. Similarly when a package is removed, an intent with PACKAGE_REMOVED action is broadcast. To receive these intents, you should write something like this: Here PackageReceiver is a BroadcastReceiver class.Its onReceive() method is invoked, every time an application package is installed or removed.

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