Implement the midnight delay option

Closes #694.

uhabits-android/src/main/java/org/isoron/uhabits/HabitsApplication.kt

@@ -24,7 +24,7 @@ import android.content.Context
 import org.isoron.uhabits.core.database.UnsupportedDatabaseVersionException
 import org.isoron.uhabits.core.reminders.ReminderScheduler
 import org.isoron.uhabits.core.ui.NotificationTray
-import org.isoron.uhabits.core.utils.DateUtils
+import org.isoron.uhabits.core.utils.DateUtils.Companion.setStartDayOffset
 import org.isoron.uhabits.inject.AppContextModule
 import org.isoron.uhabits.inject.DaggerHabitsApplicationComponent
 import org.isoron.uhabits.inject.HabitsApplicationComponent
@@ -67,14 +67,22 @@ class HabitsApplication : Application() {
             .habitsModule(HabitsModule(db))
             .build()
 
-        DateUtils.setStartDayOffset(3, 0)
+        val prefs = component.preferences
+        prefs.lastAppVersion = BuildConfig.VERSION_CODE
+
+        if (prefs.isMidnightDelayEnabled) {
+            setStartDayOffset(3, 0)
+        } else {
+            setStartDayOffset(0, 0)
+        }
 
         val habitList = component.habitList
         for (h in habitList) h.recompute()
 
-        widgetUpdater = component.widgetUpdater
-        widgetUpdater.startListening()
-        widgetUpdater.scheduleStartDayWidgetUpdate()
+        widgetUpdater = component.widgetUpdater.apply {
+            startListening()
+            scheduleStartDayWidgetUpdate()
+        }
 
         reminderScheduler = component.reminderScheduler
         reminderScheduler.startListening()
@@ -82,9 +90,6 @@ class HabitsApplication : Application() {
         notificationTray = component.notificationTray
         notificationTray.startListening()
 
-        val prefs = component.preferences
-        prefs.lastAppVersion = BuildConfig.VERSION_CODE
-
         val taskRunner = component.taskRunner
         taskRunner.execute {
             reminderScheduler.scheduleAll()

uhabits-android/src/main/java/org/isoron/uhabits/preferences/SharedPreferencesStorage.kt

@@ -86,6 +86,8 @@ class SharedPreferencesStorage
         when (key) {
             "pref_checkmark_reverse_order" ->
                 preferences.isCheckmarkSequenceReversed = getBoolean(key, false)
+            "pref_midnight_delay" ->
+                preferences.isMidnightDelayEnabled = getBoolean(key, false)
             "pref_sticky_notifications" ->
                 preferences.setNotificationsSticky(getBoolean(key, false))
             "pref_led_notifications" ->

uhabits-android/src/main/res/values/strings.xml

@@ -240,4 +240,6 @@
     <string name="pref_unknown_description">Differentiate days without data from actual lapses. To enter a lapse, toggle twice.</string>
     <string name="you_are_now_a_developer">You are now a developer</string>
     <string name="activity_not_found">No app was found to support this action</string>
-</resources>
+    <string name="pref_midnight_delay_title">Extend day a few hours past midnight</string>
+    <string name="pref_midnight_delay_description">Wait until 3:00 AM to show a new day. Useful if you typically go to sleep after midnight. N.B.: this setting will not take effect until you restart the app.</string>
+</resources>

uhabits-android/src/main/res/xml/preferences.xml

@@ -31,6 +31,13 @@
                 android:title="@string/pref_toggle_title"
                 app:iconSpaceReserved="false" />
 
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="pref_midnight_delay"
+            android:summary="@string/pref_midnight_delay_description"
+            android:title="@string/pref_midnight_delay_title"
+            app:iconSpaceReserved="false" />
+
         <CheckBoxPreference
             android:defaultValue="false"
             android:key="pref_skip_enabled"
@@ -245,4 +252,4 @@
 
     </PreferenceCategory>
 
-</PreferenceScreen>
+</PreferenceScreen>