intent.setAction(Intent.ACTION_GET_CONTENT);
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
This intent should allow the user to browse and select multiple images from his device. It should work from Android 4.3 – but it does not work on the TomTom Bridge I'm developing for.
I've found undocumented Intents for multi-select galleries that work for Samsung devices (http://coder-jeff.blogspot.com/2016/05/how-to-pick-multiple-files-from.html).
Anything similar on the TomTom?