properly pick either the dark or light dialog theme

app/src/main/kotlin/com/simplemobiletools/calendar/activities/EventActivity.kt

@@ -11,6 +11,7 @@ import android.view.WindowManager
 import android.widget.AdapterView
 import com.simplemobiletools.calendar.R
 import com.simplemobiletools.calendar.extensions.beVisibleIf
+import com.simplemobiletools.calendar.extensions.getAppropriateTheme
 import com.simplemobiletools.calendar.extensions.scheduleNotification
 import com.simplemobiletools.calendar.helpers.*
 import com.simplemobiletools.calendar.models.Event
@@ -35,7 +36,7 @@ class EventActivity : SimpleActivity(), DBHelper.EventUpdateListener {
         setContentView(R.layout.activity_event)
 
         val intent = intent ?: return
-        mDialogTheme = if (config.backgroundColor.getContrastColor() == Color.WHITE) R.style.DialogTheme_Dark else R.style.DialogTheme
+        mDialogTheme = getAppropriateTheme()
 
         mWasReminderInit = false
         val eventId = intent.getIntExtra(EVENT_ID, 0)

app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt

@@ -6,12 +6,14 @@ import android.appwidget.AppWidgetManager
 import android.content.ComponentName
 import android.content.Context
 import android.content.Intent
+import android.graphics.Color
 import android.os.Build
 import android.os.SystemClock
 import com.simplemobiletools.calendar.R
 import com.simplemobiletools.calendar.helpers.*
 import com.simplemobiletools.calendar.models.Event
 import com.simplemobiletools.calendar.receivers.NotificationReceiver
+import com.simplemobiletools.commons.extensions.getContrastColor
 
 fun Context.updateWidgets() {
     val widgetsCnt = AppWidgetManager.getInstance(this).getAppWidgetIds(ComponentName(this, MyWidgetMonthlyProvider::class.java))
@@ -91,3 +93,7 @@ private fun getNotificationIntent(context: Context, eventId: Int): PendingIntent
     intent.putExtra(EVENT_ID, eventId)
     return PendingIntent.getBroadcast(context, eventId, intent, PendingIntent.FLAG_UPDATE_CURRENT)
 }
+
+fun Context.getAppropriateTheme(): Int {
+    return if (Config.newInstance(this).backgroundColor.getContrastColor() == Color.WHITE) R.style.DialogTheme_Dark else R.style.DialogTheme
+}

app/src/main/kotlin/com/simplemobiletools/calendar/fragments/DayFragment.kt

@@ -15,14 +15,17 @@ import com.simplemobiletools.calendar.R
 import com.simplemobiletools.calendar.activities.EventActivity
 import com.simplemobiletools.calendar.activities.SimpleActivity
 import com.simplemobiletools.calendar.adapters.DayEventsAdapter
+import com.simplemobiletools.calendar.extensions.getAppropriateTheme
 import com.simplemobiletools.calendar.helpers.*
 import com.simplemobiletools.calendar.helpers.Formatter
 import com.simplemobiletools.calendar.interfaces.NavigationListener
 import com.simplemobiletools.calendar.models.Event
 import com.simplemobiletools.commons.extensions.adjustAlpha
+import com.simplemobiletools.commons.extensions.setupDialogStuff
 import com.simplemobiletools.commons.views.RecyclerViewDivider
 import kotlinx.android.synthetic.main.fragment_day.view.*
 import kotlinx.android.synthetic.main.top_navigation.view.*
+import org.joda.time.DateTime
 import java.util.*
 import kotlin.comparisons.compareBy
 
@@ -85,17 +88,22 @@ class DayFragment : Fragment(), DBHelper.EventUpdateListener, DBHelper.GetEvents
     }
 
     fun pickDay() {
-        val alertDialog = AlertDialog.Builder(context)
+        activity.setTheme(context.getAppropriateTheme())
         val view = getLayoutInflater(arguments).inflate(R.layout.date_picker, null)
         val datePicker = view.findViewById(R.id.date_picker) as DatePicker
 
         val dateTime = Formatter.getDateTimeFromCode(mDayCode)
         datePicker.init(dateTime.year, dateTime.monthOfYear - 1, dateTime.dayOfMonth, null)
 
-        alertDialog.apply {
-            setView(view)
-            setNegativeButton(R.string.cancel, null)
-            setPositiveButton(R.string.ok) { dialog, id ->
+        AlertDialog.Builder(context)
+                .setNegativeButton(R.string.cancel, null)
+                .setPositiveButton(R.string.ok) { dialog, which -> positivePressed(dateTime, datePicker) }
+                .create().apply {
+            context.setupDialogStuff(view, this)
+        }
+    }
+
+    private fun positivePressed(dateTime: DateTime, datePicker: DatePicker) {
         val month = datePicker.month + 1
         val year = datePicker.year
         val day = datePicker.dayOfMonth
@@ -103,10 +111,6 @@ class DayFragment : Fragment(), DBHelper.EventUpdateListener, DBHelper.GetEvents
         mListener?.goToDateTime(newDateTime)
     }
 
-            show()
-        }
-    }
-
     private fun checkEvents() {
         val startTS = Formatter.getDayStartTS(mDayCode)
         val endTS = Formatter.getDayEndTS(mDayCode)

app/src/main/kotlin/com/simplemobiletools/calendar/fragments/MonthFragment.kt

@@ -16,11 +16,13 @@ import com.simplemobiletools.calendar.MonthlyCalendarImpl
 import com.simplemobiletools.calendar.R
 import com.simplemobiletools.calendar.activities.DayActivity
 import com.simplemobiletools.calendar.extensions.beVisibleIf
+import com.simplemobiletools.calendar.extensions.getAppropriateTheme
 import com.simplemobiletools.calendar.helpers.*
 import com.simplemobiletools.calendar.interfaces.MonthlyCalendar
 import com.simplemobiletools.calendar.interfaces.NavigationListener
 import com.simplemobiletools.calendar.models.Day
 import com.simplemobiletools.commons.extensions.adjustAlpha
+import com.simplemobiletools.commons.extensions.setupDialogStuff
 import kotlinx.android.synthetic.main.first_row.*
 import kotlinx.android.synthetic.main.fragment_month.view.*
 import kotlinx.android.synthetic.main.top_navigation.view.*
@@ -120,7 +122,7 @@ class MonthFragment : Fragment(), MonthlyCalendar {
     }
 
     fun showMonthDialog() {
-        val alertDialog = AlertDialog.Builder(context)
+        activity.setTheme(context.getAppropriateTheme())
         val view = getLayoutInflater(arguments).inflate(R.layout.date_picker, null)
         val datePicker = view.findViewById(R.id.date_picker) as DatePicker
         datePicker.findViewById(Resources.getSystem().getIdentifier("day", "id", "android")).visibility = View.GONE
@@ -128,20 +130,21 @@ class MonthFragment : Fragment(), MonthlyCalendar {
         val dateTime = DateTime(mCalendar.mTargetDate.toString())
         datePicker.init(dateTime.year, dateTime.monthOfYear - 1, 1, null)
 
-        alertDialog.apply {
-            setView(view)
-            setNegativeButton(R.string.cancel, null)
-            setPositiveButton(R.string.ok) { dialog, id ->
+        AlertDialog.Builder(context)
+                .setNegativeButton(R.string.cancel, null)
+                .setPositiveButton(R.string.ok) { dialog, which -> positivePressed(dateTime, datePicker) }
+                .create().apply {
+            context.setupDialogStuff(view, this)
+        }
+    }
+
+    private fun positivePressed(dateTime: DateTime, datePicker: DatePicker) {
         val month = datePicker.month + 1
         val year = datePicker.year
         val newDateTime = dateTime.withDate(year, month, 1)
         mListener?.goToDateTime(newDateTime)
     }
 
-            show()
-        }
-    }
-
     private fun setupLabels() {
         val letters = letterIDs