feat: Add Chinese calendar to smartspace

lawnchair/res/values/strings.xml

@@ -410,7 +410,7 @@
     <!-- Date formats -->
     <string name="smartspace_calendar_gregorian">Gregorian</string>
     <string name="smartspace_calendar_persian">Persian</string>
-    <string name="smartspace_calendar_buddhist">Buddhist</string>
+    <string name="smartspace_calendar_chinese">Chinese</string>
 
     <string name="generic_smartspace_concatenated_desc">%1$s, %2$s</string>
     <string name="smartspace_icu_date_pattern_gregorian_wday_month_day_no_year" translatable="false">EEEMMMd</string>

lawnchair/src/app/lawnchair/smartspace/IcuDateTextView.kt

@@ -93,12 +93,39 @@ class IcuDateTextView @JvmOverloads constructor(
         }
         val formatter = when (calendar) {
             SmartspaceCalendar.Persian -> createPersianFormatter()
+            SmartspaceCalendar.Chinese -> createChineseLunarFormatter()
             else -> createGregorianFormatter()
         }
         formatterFunction = formatter
         return formatter
     }
 
+    private fun createChineseLunarFormatter(): FormatterFunction {
+        var format: String
+        if (dateTimeOptions.showTime) {
+            format = context.getString(
+                when {
+                    dateTimeOptions.timeFormat is SmartspaceTimeFormat.TwelveHourFormat -> R.string.smartspace_icu_date_pattern_gregorian_time_12h
+                    dateTimeOptions.timeFormat is SmartspaceTimeFormat.TwentyFourHourFormat -> R.string.smartspace_icu_date_pattern_gregorian_time
+                    is24HourFormat(context) -> R.string.smartspace_icu_date_pattern_gregorian_time
+                    else -> R.string.smartspace_icu_date_pattern_gregorian_time_12h
+                },
+            )
+            if (dateTimeOptions.showDate) format += context.getString(R.string.smartspace_icu_date_pattern_gregorian_date)
+        } else {
+            format = context.getString(R.string.smartspace_icu_date_pattern_gregorian_wday_month_day_no_year)
+        }
+
+        val chineseLocale = Locale.Builder()
+            .setLocale(Locale.CHINESE)
+            .setUnicodeLocaleKeyword("ca", "chinese")
+            .build()
+
+        val formatter = DateFormat.getInstanceForSkeleton(format, chineseLocale)
+        formatter.setContext(DisplayContext.CAPITALIZATION_FOR_STANDALONE)
+        return { formatter.format(it) }
+    }
+
     private fun createPersianFormatter(): FormatterFunction {
         var format: String
         if (dateTimeOptions.showTime) {

lawnchair/src/app/lawnchair/smartspace/model/SmartspaceCalendar.kt

@@ -14,13 +14,14 @@ sealed class SmartspaceCalendar(@StringRes val nameResourceId: Int, val formatCu
 
         fun fromString(value: String): SmartspaceCalendar = when (value) {
             "persian" -> Persian
+            "chinese" -> Chinese
             else -> Gregorian
         }
 
         /**
          * @return The list of all calendars.
          */
-        fun values() = listOf(Gregorian, Persian)
+        fun values() = listOf(Gregorian, Persian, Chinese)
     }
 
     object Gregorian : SmartspaceCalendar(nameResourceId = R.string.smartspace_calendar_gregorian) {
@@ -30,4 +31,8 @@ sealed class SmartspaceCalendar(@StringRes val nameResourceId: Int, val formatCu
         // Officially known as Solar Hijri
         override fun toString() = "persian"
     }
+
+    object Chinese : SmartspaceCalendar(nameResourceId = R.string.smartspace_calendar_chinese) {
+        override fun toString() = "chinese"
+    }
 }