如何在应用程序关闭时生成通知以进行事件提醒？

Question

我是移动开发的初学者，我正在开发一个生日应用程序，它将在一个人生日的前几天和生日那天生成通知。我不明白当应用程序不是运行时要使用什么样的服务来跟踪生日之前的日子，到目前为止，我已经设法使用以下代码生成点击通知。

public class MainActivity extends AppCompatActivity implements View.OnClickListener, ItemClickListener {

    public void sendOnBirthdayChannelRemainingDays(View v){
        String message = "This is a very happy birthday to you message";
        Intent activityIntent = new Intent(this, MainActivity.class);
        activityIntent.putExtra("toastMessage", message);
        activityIntent.addCategory(Intent. CATEGORY_LAUNCHER ) ;
        activityIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext()
        , 0, activityIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        Notification notification = new NotificationCompat.Builder(this, CHANNEL_BIRTHDAY_DAYSREMAINING_ID)
                .setSmallIcon(R.drawable.ic_gift_box)
                .setContentTitle("Birthday")
                .setContentText("Its one day before your birthday")
                .setAutoCancel(true)
                .setPriority(NotificationCompat.PRIORITY_MAX)
                .setCategory(NotificationCompat.CATEGORY_MESSAGE)
                .setContentIntent(contentIntent)
                .build();

        notificationManager.notify(1, notification);

    }
}

Answer 1

我进行了研究并找到了解决方案。我们将不得不将 AlarmManager class 与系统服务一起使用，使用挂起的意图来传递指定的日期。 OS 闹钟服务会在指定日期通知我们并唤醒设备。

只需要在MainActivity中调用这个函数

private void setAlarm(String date) {
    AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

    Intent intent = new Intent(getApplicationContext(), NotificationReceiver.class);
    intent.putExtra("date", date); 
    

    PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 1000, intent, PendingIntent.FLAG_ONE_SHOT);
    String dateandtime = date + " " + "10:00";
    DateFormat formatter = new SimpleDateFormat("d-M-yyyy hh:mm");
    try {
        Date date1 = formatter.parse(dateandtime);
        Toast.makeText(mContext, "Alarm set to" + date1.toString(), Toast.LENGTH_SHORT).show();
        am.set(AlarmManager.RTC_WAKEUP, date1.getTime(), pendingIntent);

    } catch (ParseException e) {
        e.printStackTrace();
    }
}

And create a NotificationReceiver class

public class NotificationReceiver 扩展 BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    Bundle bundle = intent.getExtras();
    String date = bundle.getString("dateString");

    //On notification click

    Intent clickNotficationIntent = new Intent(context, MainActivity.class);
    clickNotficationIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    clickNotficationIntent.putExtra("dateString", date);
    clickNotficationIntent.putExtra("shan", "myMessage");
    
    //Click Pending Intent
    PendingIntent pendingIntentClick = PendingIntent.getActivity(context,  2000, clickNotficationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    //Notification Builder
    Notification notification = new NotificationCompat.Builder(context, CHANNEL_BIRTHDAY_DAYSREMAINING_ID)
            .setSmallIcon(R.drawable.ic_gift_box)
            .setContentTitle("Birthday")
            .setContentText("Its one day before your birthday")
            .setAutoCancel(true)
            .setPriority(NotificationCompat.PRIORITY_MAX)
            .setCategory(NotificationCompat.CATEGORY_MESSAGE)
            .setContentIntent(pendingIntentClick)
            .build();

    notificationManager.notify(1, notification);
}

}

CHANNEL_BIRTHDAY_DAYSREMAINING_ID 是我的通知渠道，我们只需要创建一个新的 class 并在那里定义渠道。

如何在应用程序关闭时生成通知以进行事件提醒？

How to generate notification when the application is closed for event reminder?

java

notifications

android

android-service