Alarm Manager Example Android Kotlin

MainActivity.kt

package com.example.espl.alarmmanagerexamplekotlin

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
     
        val alarmReceiver=AlarmReceiver()

        btnSetAlarm.setOnClickListener(View.OnClickListener { v: View? ->
            //This will set repeating alarm on start of the app
           //On button click alarmManager will set exact repeating alarm android at interval of 1minute
            alarmReceiver.setRepeatingAlarmReminder(this)
        })

        btnCancelAlarm.setOnClickListener(View.OnClickListener { v: View? ->
            // this cancel repeating alarm on start of the app
            alarmReceiver.cancelAlarm(this)
        })
    }
}

BootBroadcastReceiver.kt

package com.example.espl.alarmmanagerexamplekotlin

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent

class  BootBroadcastReceiver : BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        val alarmReceiver = AlarmReceiver()
        if(intent?.action.equals(Intent.ACTION_BOOT_COMPLETED)){
            alarmReceiver.setRepeatingAlarmReminder(context!!);
            }
    }
}

AlarmSchedulingService.kt

package com.example.espl.alarmmanagerexamplekotlin

import android.content.Context
import android.content.Intent
import android.support.v4.app.JobIntentService
import android.util.Log
/**
 * JobIntentClass written in Kotlin
 **/
class AlarmSchedulingService : JobIntentService() {
    //Constant ID to recognise the job
    val JOB_ID = 1000
    fun enqueueWork(context: Context , work:Intent) {
        enqueueWork(context, AlarmSchedulingService::class.java, JOB_ID, work)
    }

    override fun onHandleWork(p0: Intent) {
        //JobIntentService as a android background service will handle the work assigned by alarmmanager intent in this example
        //do your work here.
        Log.e("onHandleWorkCalled","::"+p0.extras.getString("RepeatingAlarm"))
    }
}

AlarmReceiver.kt

package com.example.espl.alarmmanagerexamplekotlin

import android.app.AlarmManager
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.app.PendingIntent
import java.util.Date
import java.text.SimpleDateFormat


class AlarmReceiver: BroadcastReceiver(){
    override fun onReceive(context: Context?, intent: Intent?) {

        val service = Intent(context, AlarmSchedulingService::class.java)
//        Log.e("onHandleWorkCalled","::onReceive"+ intent?.extras?.getString("RepeatingAlarm"))
//        service.putExtra("RepeatingAlarm", intent?.extras?.getString("RepeatingAlarm"));
        val dateFormat = SimpleDateFormat("yyyy-MM-dd hh:mm:ss a")
        service.putExtra("RepeatingAlarm","Time:"+dateFormat.format(Date()))
        AlarmSchedulingService().enqueueWork(context!!,service)
    }

    fun setRepeatingAlarmReminder(context:Context) {
//Below code is to set alarm in android programmatically with repeating interval of 1 minute
        val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
        val intent = Intent(context, AlarmReceiver::class.java)
        val pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0)
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), (1000 * 60).toLong(), pendingIntent) // Millisec * Second
    }

    fun cancelAlarm(context: Context) {
        val intent = Intent(context, AlarmReceiver::class.java)
        val sender = PendingIntent.getBroadcast(context, 0, intent, 0)
        val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
        alarmManager.cancel(sender)
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.espl.alarmmanagerexamplekotlin">

    <uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
 
    <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <receiver android:process=":remote" android:name=".AlarmReceiver"></receiver>

        <receiver android:name=".BootBroadcastReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"></action>
            </intent-filter>
        </receiver>

        <service
                android:name=".AlarmSchedulingService"
                android:permission="android.permission.BIND_JOB_SERVICE" />
    </application>

</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="match_parent"
        android:gravity="center_horizontal"
        tools:context=".MainActivity">

    <Button
            android:id="@+id/btnSetAlarm"
            android:layout_margin="20dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Start Alarm-set Repeating Alarm Reminder"
            android:textAllCaps="false"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

    <Button
            android:id="@+id/btnCancelAlarm"
            android:layout_margin="20dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Cancel Alarm - cancel the repeating Alarm"
            android:textAllCaps="false"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

</LinearLayout>

Output log of repeating alarm android kotlin:

04-23 18:18:18.219 10840-12057/com.example.espl.alarmmanagerexamplekotlin E/onHandleWorkCalled: ::Time:2019-04-23 06:18:18 PM

04-23 18:19:46.961 10840-12198/com.example.espl.alarmmanagerexamplekotlin E/onHandleWorkCalled: ::Time:2019-04-23 06:19:46 PM

04-23 18:20:46.735 10840-12297/com.example.espl.alarmmanagerexamplekotlin E/onHandleWorkCalled: ::Time:2019-04-23 06:20:46 PM

04-23 18:21:46.788 10840-12341/com.example.espl.alarmmanagerexamplekotlin E/onHandleWorkCalled: ::Time:2019-04-23 06:21:46 PM

04-23 18:22:48.589 10840-13166/com.example.espl.alarmmanagerexamplekotlin E/onHandleWorkCalled: ::Time:2019-04-23 06:22:48 PM

04-23 18:23:48.848 10840-13372/com.example.espl.alarmmanagerexamplekotlin E/onHandleWorkCalled: ::Time:2019-04-23 06:23:48 PM