The default character set is set to UTF-8 on selecting New from
the toolbar. It may be changed in the menu. Android defaults to
UTF-8, don't use anything else unless you are sure what you are
doing.
The current character set is optionally detected on reading a file by the detection code from International Components for Unicode. If there are no accented characters or symbols in the text to give the detection algorithm something to work on it may not get it right.
Files will be saved using the current character set. To change it, use the Charset item in the menu, which shows the current set.
Caution – If you add accented characters or symbols to the text, make sure to check the current character set before you save it.
The character set may be set to UTF-8 by using a mode line in the text.
# ed: cs:u
See Mode line for details.