Up to now RetroArch still cannot display Chinese correctly by default. I managed to display Chinese correctly in menu by replacing the font.ttf in /data/user/0/com.retroarch.ra32/assets/glui with other font such as msyh.ttf. But RA still cannot display correct Chinese on Onscreen Notification. I know I can select font for Onscreen Notification through the Notification Font option in RA menu. I am just curious about which font RA is using for Onscreen Notification by default. I have a rooted phone so replacing file in system partition is not a problem. Thanks.
