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Can SharedPreferences be shared between different Android apps?

As I checked in the API description for getSharedPreferences (String, int), the second attribute defines the accessibility mode and can take 0 or MODE_PRIVATE for the default operation MODE_WORLD_READABLE and MODE_WORLD_WRITEABLE for managing permissions.

But there is this small note in the API description:

Note: this class (android.content.SharedPreferences) currently does not support the use of multiple processes. This will be added later.

In addition, in Mark L. Murphy’s book, “The Beginning of Android 2,” he mentioned:

(In the end, preferences may be for all applications, but which is not supported at the time of this letter)

I'm so confused! Does this mean that MODE_WORLD_READABLE and MODE_WORLD_WRITEABLE from getSharedPrefrences are there, but DID NOT SUPPORT YET at the last API level ???

Thanks! Migan

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My book reference is based on this comment.

Also, creating any MODE_WORLD_READABLE file or (even worse) MODE_WORLD_WRITEABLE is a bad idea. You lose hope of security.

If you want to share data between two applications, there are many solutions, such as:

  • AIDL open API service
  • with an API being opened via commands sent via startService() and responses sent via Messenger or createPendingResult() PendingIntent or something
  • content provider
  • Broadcast Intents

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

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