Create a alarm manager to trigger at 9.30 PM everyday and display a notification to the user
Hello Everyone, In the code, I just simply trigger an alarm at 9.30 PM every day and show a notification to the user. You can modify the code according
to you need For more detailed information you can visit official android
website https://developer.android.com/training/scheduling/alarms
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| class MainActivity : Activity() { | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContentView(R.layout.activity_main) | |
| //set alarm time to 9:30 PM to trigger | |
| val calendar: Calendar = Calendar.getInstance() | |
| calendar.set(Calendar.HOUR_OF_DAY, 21) | |
| calendar.set(Calendar.MINUTE, 30) | |
| calendar.set(Calendar.SECOND, 0) | |
| val al = com.app.base.ReminderServices.AlarmReceiver() | |
| al.setAlarm(this@MainActivity, calendar, Random().nextInt(10) + 1) | |
| } |
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| package com.app.base.ReminderServices | |
| import android.content.BroadcastReceiver | |
| import android.content.Context | |
| import android.content.Intent | |
| import java.util.* | |
| /** | |
| * Created by Suraj Bahadur on 17-Aug-20. | |
| */ | |
| class AlarmBootReceiver : BroadcastReceiver() { | |
| override fun onReceive(ctx: Context?, intent: Intent?) { | |
| try { | |
| if (intent!!.action == "android.intent.action.BOOT_COMPLETED") { | |
| // Set the alarm here. | |
| val calendar: Calendar = Calendar.getInstance() | |
| calendar.set(Calendar.HOUR_OF_DAY, 21) | |
| calendar.set(Calendar.MINUTE, 30) | |
| calendar.set(Calendar.SECOND, 0) | |
| val al = AlarmReceiver() | |
| al.setAlarm(ctx!!, calendar, Random().nextInt(10) + 1) | |
| } | |
| } catch (e: Exception) { | |
| e.printStackTrace() | |
| } | |
| } | |
| } |
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| package com.app.base.ReminderServices | |
| import android.app.AlarmManager | |
| import android.app.NotificationChannel | |
| import android.app.NotificationManager | |
| import android.app.PendingIntent | |
| import android.content.ComponentName | |
| import android.content.Context | |
| import android.content.Intent | |
| import android.content.pm.PackageManager | |
| import android.graphics.BitmapFactory | |
| import android.graphics.Color | |
| import android.os.Build | |
| import android.provider.Settings | |
| import androidx.core.app.NotificationCompat | |
| import androidx.core.content.ContextCompat | |
| import androidx.legacy.content.WakefulBroadcastReceiver | |
| import com.app.base.R | |
| import com.app.base.activity.MainActivity | |
| import java.util.* | |
| class AlarmReceiver : WakefulBroadcastReceiver() { | |
| var mAlarmManager: AlarmManager? = null | |
| var mPendingIntent: PendingIntent? = null | |
| override fun onReceive(context: Context, intent: Intent) { | |
| val mNotificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager | |
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { | |
| val channel = NotificationChannel("default", CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH) | |
| channel.description = "温馨提示：請把回收桶掛於門外，以便明天上午九時至下午六時回收。若回收時段內沒有把回收桶掛於門外，本星期將不會回收" | |
| channel.lightColor = Color.parseColor("#067EE8") | |
| mNotificationManager.createNotificationChannel(channel) | |
| } | |
| val mBuilder = NotificationCompat.Builder(context, "default") | |
| .setSmallIcon(R.mipmap.ic_launcher) // notification icon | |
| .setLargeIcon(BitmapFactory.decodeResource(context.resources, R.drawable.dustbin)) | |
| .setContentTitle("回收通知") // title for notification | |
| .setContentText("温馨提示：請把回收桶掛於門外，以便明天上午九時至下午六時回收。若回收時段內沒有把回收桶掛於門外，本星期將不會回收") // message for notification | |
| .setSound(Settings.System.DEFAULT_NOTIFICATION_URI) // set alarm sound for notification | |
| .setChannelId("default") | |
| .setColor(ContextCompat.getColor(context, R.color.colorPrimary)) | |
| .setAutoCancel(true) // clear notification after click | |
| val intent1 = Intent(context, MainActivity::class.java) | |
| val pi = PendingIntent.getActivity(context, 0, intent1, PendingIntent.FLAG_ONE_SHOT) | |
| mBuilder.setContentIntent(pi) | |
| mNotificationManager.notify(0, mBuilder.build()) | |
| } | |
| fun setAlarm(context: Context, calendar: Calendar, ID: Int) { | |
| mAlarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager | |
| // Put Reminder ID in Intent Extra | |
| val intent = Intent(context, AlarmReceiver::class.java) | |
| intent.putExtra("TaskID_Alarm", Integer.toString(ID)) | |
| mPendingIntent = PendingIntent.getBroadcast(context, ID, intent, PendingIntent.FLAG_CANCEL_CURRENT) | |
| // Calculate notification time | |
| val c = Calendar.getInstance() | |
| mAlarmManager!!.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.timeInMillis, AlarmManager.INTERVAL_DAY, mPendingIntent) | |
| // Restart alarm if device is rebooted | |
| val receiver = ComponentName(context, AlarmBootReceiver::class.java) | |
| context.packageManager.setComponentEnabledSetting( | |
| receiver, | |
| PackageManager.COMPONENT_ENABLED_STATE_ENABLED, | |
| PackageManager.DONT_KILL_APP | |
| ) | |
| } | |
| companion object { | |
| const val CHANNEL_NAME = "test" | |
| } | |
| } |
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| //Set the RECEIVE_BOOT_COMPLETED permission in your application's manifest. This allows your app | |
| //to receive the ACTION_BOOT_COMPLETED that is broadcast after the system finishes booting (this only works if | |
| //the app has already been launched by the user at least once): | |
| <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> | |
| <receiver android:name=".ReminderServices.AlarmReceiver" | |
| android:enabled="false"> | |
| <intent-filter> | |
| <action android:name="android.intent.action.BOOT_COMPLETED"/> | |
| </intent-filter> | |
| </receiver> |
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