[android-developers] Re: Write to another application's internal memory

I think that the fact that this question is about "writing to internal memory" is confusing people.  I think that all you want to do is allow App2 access to a file owned by App1.  That is probably pretty easy:

App1 will own the file(s).  They will be in its sandbox files directory and not visible to any other app including App2.  App1 must contain a ContentProvider that supports  android:grantUriPermissions.  When App1 wants to pass a file to App2 it will fire an intent to a service in App2, with a URI that identifies, to its own (App1's) content provider, the file it wants to share.  A Service in App2 catches the intent and makes a request for an {In, Out}putStream, for the URI, to the content provider in App1.  App1's ContentProvider.openFIle method decodes the URI and opens and returns a ParcelFileDescriptor for the file to which it corresponds. (fyi, don't try this with assets!).

Bob's your uncle.

-blake

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