do not allow enabling an alarm if no days are selected

app/src/main/kotlin/com/simplemobiletools/clock/adapters/AlarmsAdapter.kt

@@ -11,6 +11,7 @@ import com.simplemobiletools.clock.models.Alarm
 import com.simplemobiletools.commons.adapters.MyRecyclerViewAdapter
 import com.simplemobiletools.commons.extensions.getAdjustedPrimaryColor
 import com.simplemobiletools.commons.extensions.getSelectedDaysString
+import com.simplemobiletools.commons.extensions.toast
 import com.simplemobiletools.commons.views.MyRecyclerView
 import kotlinx.android.synthetic.main.item_alarm.view.*
 import java.util.*
@@ -81,7 +82,12 @@ class AlarmsAdapter(activity: SimpleActivity, var alarms: ArrayList<Alarm>, val
             alarm_switch.isChecked = alarm.isEnabled
             alarm_switch.setColors(textColor, adjustedPrimaryColor, backgroundColor)
             alarm_switch.setOnClickListener {
+                if (alarm.days > 0) {
                     toggleAlarmInterface.alarmToggled(alarm.id, alarm_switch.isChecked)
+                } else {
+                    activity.toast(R.string.no_days_selected)
+                    alarm_switch.isChecked = false
+                }
             }
         }
     }

app/src/main/kotlin/com/simplemobiletools/clock/dialogs/EditAlarmDialog.kt

@@ -92,6 +92,11 @@ class EditAlarmDialog(val activity: SimpleActivity, val alarm: Alarm, val callba
 
     private fun dialogConfirmed() {
         alarm.label = view.edit_alarm_label.value
+        if (alarm.days == 0) {
+            activity.toast(R.string.no_days_selected)
+            alarm.isEnabled = false
+        }
+
         if (!activity.dbHelper.updateAlarm(alarm)) {
             activity.toast(R.string.unknown_error_occurred)
         }

app/src/main/res/values-pt/strings.xml

@@ -4,6 +4,7 @@
     <string name="time_zone">Fuso horário</string>
     <string name="vibrate">Vibrate</string>
     <string name="label">Label</string>
+    <string name="no_days_selected">No days selected</string>
 
     <!-- Settings -->
     <string name="clock_tab">Relógio</string>

app/src/main/res/values-sk/strings.xml

@@ -4,6 +4,7 @@
     <string name="time_zone">Časové pásmo</string>
     <string name="vibrate">Vibrovanie</string>
     <string name="label">Štítok</string>
+    <string name="no_days_selected">Neboli označené žiadne dni</string>
 
     <!-- Settings -->
     <string name="clock_tab">Okno s časom</string>

app/src/main/res/values/strings.xml

@@ -4,6 +4,7 @@
     <string name="time_zone">Time zone</string>
     <string name="vibrate">Vibrate</string>
     <string name="label">Label</string>
+    <string name="no_days_selected">No days selected</string>
 
     <!-- Settings -->
     <string name="clock_tab">Clock tab</string>