android: Ask where to save PDF file on export

In Android Viewer, show a file picker to select
where to save the PDF file on PDF export, rather
than unconditionally trying to save in the
"Documents" directory.

This also means that permission
'android.PERMISSION_WRITE_EXTERNAL_STORAGE' is
now no longer needed for this task, s. commit
message from

commit 7d9db806d65cb814af1e99a1e79c3db5aa7c17d5
Date:   Fri Apr 9 11:24:16 2021 +0200

android: Request PERMISSION_WRITE_EXTERNAL_STORAGE again

for more details.

Also, adapt the 'TileKitProvider#saveDocumentAs'
methods to return a boolean value indicating
whether the save operation was successful,
and trigger showing the message right into
'LibreOfficeMainActivity#exportToPDF'.

Rename 'LOKitTileProvider#exportToPDF(boolean print)' to
just 'LOKitTileProvider#printDocument()', since the only
remaining use case for which it is used is printing now.

Change-Id: I779d782813ca01640811690a388a4b7fd3db4b2a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114143
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions