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How to implement AlarmManager in Android using Kotlin?
This example demonstrates how to to implement AlarmManager in Android using Kotlin.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="2dp" tools:context=".MainActivity"> <TimePicker android:id="@+id/timePicker" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerHorizontal="true" /> <Button android:id="@+id/buttonAlarm" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/timePicker" android:layout_centerInParent="true" android:layout_marginTop="10dp" android:text="Set Alarm" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.app.AlarmManager
import android.app.PendingIntent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.util.Log
import android.widget.Button
import android.widget.TimePicker
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import java.util.*
class MainActivity : AppCompatActivity() {
lateinit var btnSetAlarm: Button
lateinit var timePicker: TimePicker
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
timePicker = findViewById(R.id.timePicker)
btnSetAlarm = findViewById(R.id.buttonAlarm)
btnSetAlarm.setOnClickListener {
val calendar: Calendar = Calendar.getInstance()
if (Build.VERSION.SDK_INT >= 23) {
calendar.set(
calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH),
timePicker.hour,
timePicker.minute,
0
)
} else {
calendar.set(
calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH),
timePicker.currentHour,
timePicker.currentMinute, 0
)
}
setAlarm(calendar.timeInMillis)
}
}
private fun setAlarm(timeInMillis: Long) {
val alarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
val intent = Intent(this, MyAlarm::class.java)
val pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0)
alarmManager.setRepeating(
AlarmManager.RTC,
timeInMillis,
AlarmManager.INTERVAL_DAY,
pendingIntent
)
Toast.makeText(this, "Alarm is set", Toast.LENGTH_SHORT).show()
}
private class MyAlarm : BroadcastReceiver() {
override fun onReceive(
context: Context,
intent: Intent
) {
Log.d("Alarm Bell", "Alarm just fired")
}
}
}Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11"> <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> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon
from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen
Updated on: 05-Nov-2020
4K+ Views
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