1. 确保您已在AndroidManifest.xml中为BroadcastReceiver添加了必要的权限：

2. 确保您有一个通知渠道用于发布通知：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    NotificationChannel channel = new NotificationChannel(channelId, channelName, importance);
    channel.setDescription(channelDescription);
    NotificationManager notificationManager = getSystemService(NotificationManager.class);
    notificationManager.createNotificationChannel(channel);
}

3. 在AlarmReceiver中创建通知：

private void sendNotification() {
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);

    String channelId = "default_channel_id";
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, channelId)
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle("My notification")
            .setContentText("Hello World!")
            .setAutoCancel(true)
            .setContentIntent(pendingIntent);

    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
    notificationManager.notify(0, builder.build());
}

4. 确保在AlarmReceiver的onReceive方法中调用发送通知方法：

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

5. 最后，在您的Activity或Fragment中创建AlarmManager：

Intent intent = new Intent(getActivity(), AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
int interval = 60 * 1000; // 1 minute
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);

这样，当AlarmManager触发BroadcastReceiver时，它将调用sendNotification方法并发布通知。