properly handle alarmclock scheduling

app/build.gradle

@@ -41,7 +41,7 @@ android {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:3.15.1'
+    implementation 'com.simplemobiletools:commons:3.15.3'
     implementation 'com.facebook.stetho:stetho:1.5.0'
     implementation 'com.android.support.constraint:constraint-layout:1.0.2'
 }

app/src/main/AndroidManifest.xml

@@ -3,6 +3,8 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.simplemobiletools.clock">
 
+    <uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
+
     <application
         android:name=".App"
         android:allowBackup="true"
@@ -47,5 +49,7 @@
             android:name="com.simplemobiletools.commons.activities.FAQActivity"
             android:label="@string/frequently_asked_questions"
             android:parentActivityName="com.simplemobiletools.commons.activities.AboutActivity"/>
+
+        <receiver android:name=".receivers.AlarmReceiver"/>
     </application>
 </manifest>

app/src/main/kotlin/com/simplemobiletools/clock/fragments/AlarmFragment.kt

@@ -1,5 +1,10 @@
 package com.simplemobiletools.clock.fragments
 
+import android.annotation.SuppressLint
+import android.app.AlarmManager
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
 import android.os.Bundle
 import android.support.v4.app.Fragment
 import android.view.LayoutInflater
@@ -12,10 +17,13 @@ import com.simplemobiletools.clock.adapters.AlarmsAdapter
 import com.simplemobiletools.clock.dialogs.EditAlarmDialog
 import com.simplemobiletools.clock.extensions.createNewAlarm
 import com.simplemobiletools.clock.extensions.dbHelper
+import com.simplemobiletools.clock.helpers.ALARM_ID
 import com.simplemobiletools.clock.interfaces.ToggleAlarmInterface
 import com.simplemobiletools.clock.models.Alarm
+import com.simplemobiletools.clock.receivers.AlarmReceiver
 import com.simplemobiletools.commons.extensions.toast
 import com.simplemobiletools.commons.extensions.updateTextColors
+import com.simplemobiletools.commons.helpers.isLollipopPlus
 import kotlinx.android.synthetic.main.fragment_alarm.view.*
 import java.util.*
 import kotlin.math.pow
@@ -90,6 +98,7 @@ class AlarmFragment : Fragment(), ToggleAlarmInterface {
             if (isCorrectDay && (alarm.timeInMinutes > currentTimeInMinutes || i > 0)) {
                 val triggerInMinutes = alarm.timeInMinutes - currentTimeInMinutes + (i * DAY_MINUTES)
                 showRemainingTimeMessage(triggerInMinutes)
+                setupAlarmClock(alarm, triggerInMinutes * 60 - calendar.get(Calendar.SECOND))
                 break
             } else {
                 calendar.add(Calendar.DAY_OF_MONTH, 1)
@@ -120,4 +129,22 @@ class AlarmFragment : Fragment(), ToggleAlarmInterface {
         val fullString = String.format(activity!!.getString(R.string.alarm_goes_off_in), timesString.toString().trim().trimEnd(','))
         activity!!.toast(fullString, Toast.LENGTH_LONG)
     }
+
+    @SuppressLint("NewApi")
+    private fun setupAlarmClock(alarm: Alarm, triggerInSeconds: Int) {
+        val alarmManager = context!!.getSystemService(Context.ALARM_SERVICE) as AlarmManager
+        val targetMS = System.currentTimeMillis() + triggerInSeconds * 1000
+        val pendingIntent = getPendingIntent(alarm)
+
+        if (isLollipopPlus()) {
+            val info = AlarmManager.AlarmClockInfo(targetMS, pendingIntent)
+            alarmManager.setAlarmClock(info, pendingIntent)
+        }
+    }
+
+    private fun getPendingIntent(alarm: Alarm): PendingIntent {
+        val intent = Intent(context, AlarmReceiver::class.java)
+        intent.putExtra(ALARM_ID, alarm.id)
+        return PendingIntent.getBroadcast(context, alarm.id, intent, PendingIntent.FLAG_UPDATE_CURRENT)
+    }
 }

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

@@ -10,6 +10,7 @@ const val EDITED_TIME_ZONE_TITLES = "edited_time_zone_titles"
 
 const val TABS_COUNT = 3
 const val EDITED_TIME_ZONE_SEPARATOR = ":"
+const val ALARM_ID = "alarm_id"
 
 fun getDefaultTimeZoneTitle(id: Int) = getAllTimeZones().firstOrNull { it.id == id }?.title ?: ""
 

app/src/main/kotlin/com/simplemobiletools/clock/helpers/DBHelper.kt

@@ -76,6 +76,8 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
         return mDb.update(ALARMS_TABLE_NAME, values, selection, selectionArgs) == 1
     }
 
+    fun getAlarmWithId(id: Int) = getAlarms().firstOrNull { it.id == id }
+
     private fun fillAlarmContentValues(alarm: Alarm): ContentValues {
         return ContentValues().apply {
             put(COL_TIME_IN_MINUTES, alarm.timeInMinutes)

app/src/main/kotlin/com/simplemobiletools/clock/receivers/AlarmReceiver.kt

@@ -0,0 +1,14 @@
+package com.simplemobiletools.clock.receivers
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import com.simplemobiletools.clock.extensions.dbHelper
+import com.simplemobiletools.clock.helpers.ALARM_ID
+
+class AlarmReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+        val id = intent.getIntExtra(ALARM_ID, -1)
+        val alarm = context.dbHelper.getAlarmWithId(id) ?: return
+    }
+}