Question

My app will be writing some files to the storage which will be used by the app when in use (like a config). This config is time dependent and will be replaced by app when required.

Currently, I am writing this to the sdcard using Environment.getExternalStorageDirectory(). But this is visible when user used a file browser and could be deleted.

Is it possible for me to prevent the file deletion except by the application itself?

I tried using Environment.getDataDirectory() but i do not have permission to write there. Is there an other way?

Answer 1

Yes. Instead of saving in public location like SD card, write your file in application private space (internal storage), like:

FileOutputStream fos = openFileOutput("myfile.dat", Context.MODE_PRIVATE);
fos.write( WebnetTools.serializeObject( sec ) );
fos.close();

See docs for more details. Be avare, that it is NOT equivalent of SD card due to limited space you got there.