Can SharedPreferences be shared among different Android applications?

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My book reference is based upon that comment.

Moreover, making any file MODE_WORLD_READABLE or (worse) MODE_WORLD_WRITEABLE is a bad idea. You lose any hope of security.

If you wish to share data between two applications, there are a myriad of solutions, such as:

  • service with an API exposed by AIDL
  • service with an API exposed via commands sent via startService() and responses sent via a Messenger or createPendingResult() PendingIntent or something
  • content provider
  • broadcast Intents

All of those allow you to define permissions for integration and let you control the granularity of access.

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