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How to use AlarmManager in Android?
This example demonstrates how do I use AlarmManager in android.
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="8dp" tools:context=".MainActivity"> <LinearLayout android:id="@+id/linearLayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:orientation="vertical"> <TimePicker android:id="@+id/timePicker" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:layout_gravity="center" android:id="@+id/buttonAlarm" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Set Alarm" /> </LinearLayout> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.java
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 Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –
Click here to download the project code.
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