首先，在AndroidManifest.xml文件中添加以下权限：

在MainActivity.java中添加以下代码：

//设置每日通知
private void setDailyNotification(){

    //获取AlarmManager系统服务
    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

    Intent notificationIntent = new Intent(getApplicationContext(), MyNotificationPublisher.class);

    //设置通知时间为每天早上8点
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 8);
    calendar.set(Calendar.MINUTE, 0);

    //将通知Intent放入PendingIntent中
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    //设置重复闹钟
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);

}

在MyNotificationPublisher.java中添加以下代码：

public class MyNotificationPublisher extends BroadcastReceiver {

    private static final int NOTIFICATION_ID = 1;
    private static final String CHANNEL_ID = "notification_channel";

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

        //创建通知渠道（Android 8.0及以上版本需要创建通知渠道）
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "Daily Notification", NotificationManager.IMPORTANCE_HIGH);
            channel.setDescription("Daily Notification");
            NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }

        //创建通知
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
                .setSmallIcon(R.drawable.notification_icon)
                .setContentTitle("Daily Notification")
                .setContentText("Today is a new day!")
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setAutoCancel(true);

        //创建PendingIntent
        Intent notificationIntent = new Intent(context, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context,