如何在android应用中设置的特定时间向用户发送通知

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

public class NotificationReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 在这里重新设置通知
        setNotification(context);
    }
}

// 注册设备启动完成广播接收器
IntentFilter filter = new IntentFilter(Intent.ACTION_BOOT_COMPLETED);
filter.addAction(Intent.ACTION_LOCKED_BOOT_COMPLETED);
NotificationReceiver receiver = new NotificationReceiver();
registerReceiver(receiver, filter);

private void setNotification(Context context) {
    // 创建通知的Builder
    NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
            .setSmallIcon(R.drawable.notification_icon)
            .setContentTitle("提醒")
            .setContentText("这是一个通知")
            .setPriority(NotificationCompat.PRIORITY_DEFAULT);

    // 设置通知的触发时间
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 8); // 设置小时
    calendar.set(Calendar.MINUTE, 0); // 设置分钟
    calendar.set(Calendar.SECOND, 0); // 设置秒钟

    // 创建一个PendingIntent，用于触发通知
    Intent intent = new Intent(context, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

    // 设置通知的触发时间
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
            AlarmManager.INTERVAL_DAY, pendingIntent);

    // 发送通知
    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
    notificationManager.notify(0, builder.build());
}