add a calendar picker to the event creation activity

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

@@ -390,6 +390,9 @@ class EventActivity : SimpleActivity(), DBHelper.EventUpdateListener {
             event_caldav_calendar_divider.beVisible()
             event_caldav_calendar_holder.setOnClickListener {
                 val calendars = CalDAVEventsHandler(applicationContext).getCalDAVCalendars().filter { it.canWrite() }
+                SelectEventCalendarDialog(this, calendars, config.lastUsedCaldavCalendar) {
+                    config.lastUsedCaldavCalendar = it
+                }
             }
         }
     }

app/src/main/kotlin/com/simplemobiletools/calendar/dialogs/SelectEventCalendarDialog.kt

@@ -0,0 +1,66 @@
+package com.simplemobiletools.calendar.dialogs
+
+import android.app.Activity
+import android.graphics.Color
+import android.support.v7.app.AlertDialog
+import android.view.ViewGroup
+import android.widget.RadioButton
+import android.widget.RadioGroup
+import com.simplemobiletools.calendar.R
+import com.simplemobiletools.calendar.extensions.config
+import com.simplemobiletools.calendar.extensions.dbHelper
+import com.simplemobiletools.calendar.models.CalDAVCalendar
+import com.simplemobiletools.commons.extensions.setBackgroundWithStroke
+import com.simplemobiletools.commons.extensions.setupDialogStuff
+import com.simplemobiletools.commons.extensions.updateTextColors
+import kotlinx.android.synthetic.main.dialog_select_radio_group.view.*
+import kotlinx.android.synthetic.main.radio_button_with_color.view.*
+
+class SelectEventCalendarDialog(val activity: Activity, val calendars: List<CalDAVCalendar>, val currCalendarId: Int, val callback: (id: Int) -> Unit) {
+    val dialog: AlertDialog?
+    val radioGroup: RadioGroup
+    var wasInit = false
+
+    init {
+        val view = activity.layoutInflater.inflate(R.layout.dialog_select_radio_group, null) as ViewGroup
+        radioGroup = view.dialog_radio_group
+
+        activity.dbHelper.getEventTypes {
+            activity.runOnUiThread {
+                calendars.forEach {
+                    addRadioButton(it.displayName, it.id.toInt(), it.color)
+                }
+                wasInit = true
+                activity.updateTextColors(view.dialog_radio_holder)
+            }
+        }
+
+        dialog = AlertDialog.Builder(activity)
+                .create().apply {
+            activity.setupDialogStuff(view, this)
+        }
+    }
+
+    private fun addRadioButton(title: String, typeId: Int, color: Int) {
+        val view = activity.layoutInflater.inflate(R.layout.radio_button_with_color, null)
+        (view.dialog_radio_button as RadioButton).apply {
+            text = title
+            isChecked = typeId == currCalendarId
+            id = typeId
+        }
+
+        if (color != Color.TRANSPARENT)
+            view.dialog_radio_color.setBackgroundWithStroke(color, activity.config.backgroundColor)
+
+        view.setOnClickListener { viewClicked(typeId) }
+        radioGroup.addView(view, RadioGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT))
+    }
+
+    fun viewClicked(typeId: Int) {
+        if (!wasInit)
+            return
+
+        callback.invoke(typeId)
+        dialog?.dismiss()
+    }
+}

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Config.kt

@@ -78,6 +78,10 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getString(CALDAV_SYNCED_CALENDAR_IDS, "")
         set(calendarIDs) = prefs.edit().putString(CALDAV_SYNCED_CALENDAR_IDS, calendarIDs).apply()
 
+    var lastUsedCaldavCalendar: Int
+        get() = prefs.getInt(LAST_USED_CALDAV_CALENDAR, 1)
+        set(calendarId) = prefs.edit().putInt(LAST_USED_CALDAV_CALENDAR, calendarId).apply()
+
     fun getCalendarIdsAsList() = caldavSyncedCalendarIDs.split(",").filter { it.trim().isNotEmpty() } as ArrayList<String>
 
     fun addDisplayEventType(type: String) {

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Constants.kt

@@ -44,6 +44,7 @@ val DISPLAY_EVENT_TYPES = "display_event_types"
 val FONT_SIZE = "font_size"
 val CALDAV_SYNC = "caldav_sync"
 val CALDAV_SYNCED_CALENDAR_IDS = "caldav_synced_calendar_ids"
+val LAST_USED_CALDAV_CALENDAR = "last_used_caldav_calendar"
 val SNOOZE_DELAY = "snooze_delay"
 val DISPLAY_PAST_EVENTS = "display_past_events"