I would also like to point out that when setting locale to Traditional Chinese for Android 6 (not tested on earlier Android versions from KitKat to Lollipop), the following codes do not work even for Activity Context: AppCompatDelegate.setApplicationLocales(LocaleListCompat.create(Locale.TRADITIONAL_CHINESE))
Description
I would also like to point out that when setting locale to Traditional Chinese for Android 6 (not tested on earlier Android versions from KitKat to Lollipop), the following codes do not work even for Activity Context: AppCompatDelegate.setApplicationLocales(LocaleListCompat.create(Locale.TRADITIONAL_CHINESE))
AppCompatDelegate.setApplicationLocales(LocaleListCompat.create(Locale.TAIWAN))
AppCompatDelegate.setApplicationLocales(LocaleListCompat.create(Locale("zh", "TW")))
AppCompatDelegate.setApplicationLocales(LocaleListCompat.create(Locale("zh_tw")))
The following works for Android 6: AppCompatDelegate.setApplicationLocales(LocaleListCompat.create(Locale("zh-tw")))