create a context extension for updating the widget

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

@@ -0,0 +1,15 @@
+package com.simplemobiletools.calendar.extensions
+
+import android.appwidget.AppWidgetManager
+import android.content.Context
+import android.content.Intent
+import com.simplemobiletools.calendar.MyWidgetProvider
+import com.simplemobiletools.calendar.R
+
+fun Context.updateWidget() {
+    val intent = Intent(this, MyWidgetProvider::class.java)
+    intent.action = AppWidgetManager.ACTION_APPWIDGET_UPDATE
+    val ids = intArrayOf(R.xml.widget_info)
+    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids)
+    sendBroadcast(intent)
+}

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

@@ -17,6 +17,7 @@ import com.simplemobiletools.calendar.*
 import com.simplemobiletools.calendar.Formatter
 import com.simplemobiletools.calendar.activities.EventActivity
 import com.simplemobiletools.calendar.adapters.EventsAdapter
+import com.simplemobiletools.calendar.extensions.updateWidget
 import com.simplemobiletools.calendar.models.Event
 import kotlinx.android.synthetic.main.day_fragment.view.*
 import kotlinx.android.synthetic.main.top_navigation.view.*
@@ -224,13 +225,16 @@ class DayFragment : Fragment(), DBHelper.DBOperationsListener, AdapterView.OnIte
     }
 
     override fun eventInserted(event: Event) {
+        context.updateWidget()
     }
 
     override fun eventUpdated(event: Event) {
+        context.updateWidget()
     }
 
     override fun eventsDeleted(cnt: Int) {
         checkEvents()
+        context.updateWidget()
     }
 
     override fun gotEvents(events: MutableList<Event>) {

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

@@ -13,6 +13,7 @@ import android.view.ViewGroup
 import android.widget.*
 import com.simplemobiletools.calendar.*
 import com.simplemobiletools.calendar.activities.DayActivity
+import com.simplemobiletools.calendar.extensions.updateWidget
 import com.simplemobiletools.calendar.models.Day
 import kotlinx.android.synthetic.main.month_fragment.view.*
 import kotlinx.android.synthetic.main.top_navigation.view.*
@@ -73,6 +74,7 @@ class MonthFragment : Fragment(), Calendar {
         activity?.runOnUiThread {
             mHolder.top_value.text = month
             updateDays(days)
+            context.updateWidget()
         }
     }