What characters allowed in file names on Android?

Question

What special characters are allowed for file names on Android?

~!@#$%^&*()_+/\.,

Also, can I save file with Unicode name?

Answer 1

If you try to add a file to the res directory in an Android project you get the following message:

res/drawable/test-1.xml: Invalid file name: must contain only [a-z0-9_.]

I'm guessing however that this only applies to files inside the .apk file.

Answer 2

1. On Android (at least by default) the file names encoded as UTF-8.

2. Looks like reserved file name characters depend on filesystem mounted (http://en.wikipedia.org/wiki/Filename).

I considered as reserved:

private static final String ReservedChars = "|\\?*<\":>+[]/'";