I need to change the Android phone to display Hijri date. I am using Android 10 and have root access.
I modified the "framework-res.apk" file in sys folder and gave Persian values to the Gregorian months, but converting the calendar to Persian is something beyond this. I need a piece of code that converts the date before displaying it. I know the code but I don't know how to set and where to apply the code.
Probably, this issue will have the same answer for Iranian, Jalali, Lunar, Chinese and other calendars.
There is a limitation: the actual value of the date should not be saved in Hijri, but it should be calculated only for display on the lock screen and notification bar.