如何在特定日期和特定时间设置通知？

huangapple
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英文:

How can I set a notification on a specific day and specific time?

问题

我想在特定日期的特定时间显示通知，就像我在标题中写的那样。
现在，我的提醒在按下按钮后的10秒内出现。如果我需要设置特定日期，我需要这样做吗？我需要将日期转换为毫秒，并提供这个参数吗？
以下是我的代码：

  1. package com.example.timeman;
  2. import android.content.BroadcastReceiver;
  3. import android.content.Context;
  4. import android.content.Intent;
  5. import androidx.core.app.NotificationCompat;
  6. import androidx.core.app.NotificationManagerCompat;
  7. public class ReminderBroadcast extends BroadcastReceiver {
  8.     @Override
  9.     public void onReceive(Context context, Intent intent) {
  10.         NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "notify")
  11.                 .setSmallIcon(R.drawable.ic_baseline_close_24)
  12.                 .setContentTitle("Salamabuliy")
  13.                 .setContentText("TextNotif")
  14.                 .setPriority(NotificationCompat.PRIORITY_DEFAULT);
  15.         NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
  17.         notificationManager.notify(200, builder.build());
  18.     }
  19. }

还有点击方法：

  1. public void onClick(View view) {
  2.     Intent intent = new Intent(getActivity(), ReminderBroadcast.class);
  3.     PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
  5.     AlarmManager alarmManager = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
  7.     long timeAtButtonClick = System.currentTimeMillis();
  9.     long tenSecondsInMillis = 1000 * 10;
  11.     alarmManager.set(AlarmManager.RTC, timeAtButtonClick + tenSecondsInMillis, pendingIntent);
  12.     //displayNotification();
  13.     OpenThis(view);
  14. }
英文:

I want to make a notification to appear on a specific date at a specific time, as I wrote in the title.
Now my alerts come in 10 seconds after pressing the button. If I need to set a specific date, do I need to do that as well? I need convert the date into milliseconds and give this parameter?
Here's my code:

  1. package com.example.timeman;
  2. import android.content.BroadcastReceiver;
  3. import android.content.Context;
  4. import android.content.Intent;
  5. import androidx.core.app.NotificationCompat;
  6. import androidx.core.app.NotificationManagerCompat;
  7. public class ReminderBroadcast extends BroadcastReceiver {
  8. @Override
  9. public void onReceive(Context context, Intent intent) {
  10.     NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "notify")
  11.             .setSmallIcon(R.drawable.ic_baseline_close_24)
  12.             .setContentTitle("Salamabuliy")
  13.             .setContentText("TextNotif")
  14.             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
  15.             ;
  16.     NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
  18.     notificationManager.notify(200, builder.build());
  19. }

}

And OnClick Method:

  1. public void onClick(View view) {
  2.             Intent intent = new Intent(getActivity(), ReminderBroadcast.class);
  3.             PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
  5.             AlarmManager alarmManager = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
  7.             long timeAtButtonClick = System.currentTimeMillis();
  9.             long tenSecondsInMillis = 1000*10;
  11.             alarmManager.set(AlarmManager.RTC, timeAtButtonClick + tenSecondsInMillis, pendingIntent);
  12.             //displayNotification();
  13.             OpenThis(view);
  14.         }

答案1

得分: 4

一个选择是找到从现在到您希望其显示的日期之间的毫秒持续时间。例如；

  1. LocalDateTime now = LocalDateTime.now();
  3. LocalDateTime end = now.plusSeconds(10); // 结束日期可以是具体的，这只是一个示例
  5. Duration difference = Duration.between(now, end);
  7. long differenceMillis = difference.toMillis();
英文:

One option would be to find the duration in millis between now and the date you want it to appear on. For example;

  1. LocalDateTime now = LocalDateTime.now();
  3. LocalDateTime end = now.plusSeconds(10); // end date can be specific, this is an example
  5. Duration difference = Duration.between(now, end);
  7. long differenceMillis = difference.toMillis();

答案2

得分: 0

使用 Instant#toEpochMilli() 和 Instant#plusSeconds，如下所示：

  1. import java.time.Instant;
  3. public class Main {
  4.     public static void main(String[] args) {
  5.         Instant now = Instant.now();
  6.         System.out.println(now.toEpochMilli());
  8.         // After 10 seconds
  9.         Instant after10SecFromNow = now.plusSeconds(10);
  10.         long millisAfter10Sec = after10SecFromNow.toEpochMilli();
  11.         System.out.println(millisAfter10Sec);
  13.         // alarmManager.set(AlarmManager.RTC, millisAfter10Sec, pendingIntent);
  14.     }
  15. }

输出：

  1. 1597837345043
  2. 1597837355043

了解更多关于 java.time<sup>*</sup> 的内容，可以参考 现代日期时间 API，以及 教程：日期时间。

<sup>* 如果由于某种原因，你必须使用 Java 6 或 Java 7，你可以使用 ThreeTen-Backport 来将大部分 java.time 功能回溯到 Java 6 和 7。如果你正在进行一个 Android 项目，并且你的 Android API 级别仍然不符合 Java 8，可以查看 通过 desugaring 使用 Java 8+ API 以及 如何在 Android 项目中使用 ThreeTenABP。
</sup>

英文:

Use Instant#toEpochMilli() and Instant#plusSeconds as shown below:

  1. import java.time.Instant;
  3. import java.time.Instant;
  5. public class Main {
  6. 	public static void main(String[] args) {
  7. 		Instant now = Instant.now();
  8. 		System.out.println(now.toEpochMilli());
  10. 		// After 10 seconds
  11. 		Instant after10SecFromNow = now.plusSeconds(10);
  12. 		long millisAfter10Sec = after10SecFromNow.toEpochMilli();
  13. 		System.out.println(millisAfter10Sec);
  15. 		// alarmManager.set(AlarmManager.RTC, millisAfter10Sec, pendingIntent);
  16. 	}
  17. }

Output:

  1. 1597837345043
  2. 1597837355043

Learn more about java.time<sup>*</sup>, the modern Date-Time API, from Trail: Date Time.

<sup>* For any reason, if you have to stick to Java 6 or Java 7, you can use ThreeTen-Backport which backports most of the java.time functionality to Java 6 & 7. If you are working for an Android project and your Android API level is still not compliant with Java-8, check Java 8+ APIs available through desugaring and How to use ThreeTenABP in Android Project.
</sup>

huangapple
  • 本文由 发表于 2020年8月19日 19:27:10
  • 转载请务必保留本文链接：https://go.coder-hub.com/63486000.html
  • android
  • android-studio
  • java
  • notifications
  • push-notification
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