how to allow another app to access my app's data directory?
android
Solution
I believe the safest approach would be to use a Content Provider. Then to access a file in application A from application B, you can declare a `ContentProvider` in application A and override the `public ParcelFileDescriptor openFile(Uri uri, String mode)` method. Then application B can access a file located in data directory of application A through an appropriate uri using the `getContentResolver().openInputStream(...)` method. For more information see:
http://www.grokkingandroid.com/handling-binary-data-with-contentproviders/
https://stackoverflow.com/a/4336013/1482726
Problem
Suppose I have an app named A with this data directory: com.example.test Now I want to make another app named B to modify something in com.example.test. Of course I know both have to share the same signature. But what else do I have to have? Basically I am trying to design an app to which users can plug in new components. Any idea?