file storage - I cannot access : getExternalFilesDir by another APP

Question

I want to write a FILE by one APP and read it by another APP ( mainly for testing ). I run this on the Android Studio emulator.

First I try to resume what I found so far in documentation, and I did some testing .
( This is not quit clear to me and I have some questions )

1. The APP has to notify the SYSTEM that it wants to use STORAGE ( = FILES ) :
   In : androidManifest.xml

2. The APPuser has to give permission :
   a) the user can set the permission using : SETTINGS
   b) the JAVA code can ask the user for permission :

ActivityCompat.requestPermissions( ..., .... WRITE_EXTERNAL_STORAGE, 1);

3. THEN the APP can access files in dir : .....
   a) getFilesDir : Internal storage ONLY accessable by: this.APP
   b) getExternalStorageDirectory : OLD replaced by : getExternalFilesDir
   c) getExternalFilesDir : External storage accessable by any APP
   d) getExternalFilesDirs : a list of more external storage locations

===== I hope I am right about this !!!!

BUT :

1. My main problem .....
   I can not access the getExternalFilesDir of another APP, It can see the directory but it is NOT_READABLE !!!
   ( I am also a bit confused by the documentation : it says :
   These files are internal to the application, and not typically visible to the user as media. ????
   and a few lines later it says :
   any application holding Manifest.permission.WRITE_EXTERNAL_STORAGE can write to these files.
   )
   REM : the directory can by read by FILES manager

2. I request the user for permission :
   requestPermissions( ..., .... WRITE_EXTERNAL_STORAGE, 1);
   This will ask the user permission for : PHOTO's and MEDIA !!!!?????

thanks .....

question from:https://stackoverflow.com/questions/65948844/i-cannot-access-getexternalfilesdir-by-another-app

Answer 1

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