I'm trying to set notification for a time in the future. I have the code for creating a notification but I can't find an option to schedule it.
How can I schedule notifications?
NOT FOR USE IN OREO+ (edit)
The answers above are good - but don't consider the user's potential to restart the device (which clears PendingIntent's scheduled by AlarmManager).
You need to create a WakefulBroadcastReceiver, which will contain an AlarmManager to schedule deliver a PendingIntent. When the WakefulBroadcastReceiver handles the intent - post your notification and signal the WakefulBroadcastReceiver to complete.
WakefulBroadcastReceiver
/**
* When the alarm fires, this WakefulBroadcastReceiver receives the broadcast Intent
* and then posts the notification.
*/
public class WakefulReceiver extends WakefulBroadcastReceiver {
// provides access to the system alarm services.
private AlarmManager mAlarmManager;
public void onReceive(Context context, Intent intent) {
//// TODO: post notification
WakefulReceiver.completeWakefulIntent(intent);
}
/**
* Sets the next alarm to run. When the alarm fires,
* the app broadcasts an Intent to this WakefulBroadcastReceiver.
* @param context the context of the app's Activity.
*/
public void setAlarm(Context context) {
mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, WakefulReceiver.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
//// TODO: use calendar.add(Calendar.SECOND,MINUTE,HOUR, int);
//calendar.add(Calendar.SECOND, 10);
//ALWAYS recompute the calendar after using add, set, roll
Date date = calendar.getTime();
mAlarmManager.setExact(AlarmManager.RTC_WAKEUP, date.getTime(), alarmIntent);
// Enable {@code BootReceiver} to automatically restart when the
// device is rebooted.
//// TODO: you may need to reference the context by ApplicationActivity.class
ComponentName receiver = new ComponentName(context, BootReceiver.class);
PackageManager pm = context.getPackageManager();
pm.setComponentEnabledSetting(receiver, PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
PackageManager.DONT_KILL_APP);
}
/**
* Cancels the next alarm from running. Removes any intents set by this
* WakefulBroadcastReceiver.
* @param context the context of the app's Activity
*/
public void cancelAlarm(Context context) {
Log.d("WakefulAlarmReceiver", "{cancelAlarm}");
mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, WakefulReceiver.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
mAlarmManager.cancel(alarmIntent);
// Disable {@code BootReceiver} so that it doesn't automatically restart when the device is rebooted.
//// TODO: you may need to reference the context by ApplicationActivity.class
ComponentName receiver = new ComponentName(context, BootReceiver.class);
PackageManager pm = context.getPackageManager();
pm.setComponentEnabledSetting(receiver, PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
PackageManager.DONT_KILL_APP);
}
BootReceiver
public class BootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
context = ApplicationActivity.class;
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, WakefulReceiver.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
//// TODO: use calendar.add(Calendar.SECOND,MINUTE,HOUR, int);
//calendar.add(Calendar.SECOND, 10);
//ALWAYS recompute the calendar after using add, set, roll
Date date = calendar.getTime();
alarmManager.setExact(AlarmManager.RTC_WAKEUP, date.getTime(), alarmIntent);
}
}
}
AndroidManifest.xml
<receiver android:name=".WakefulReceiver"/>
<receiver android:name=".BootReceiver"
android:enabled="false">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>