Android通知会多次打开，而不是只打开一次

int notificationId = (int) System.currentTimeMillis(); // 使用当前时间作为唯一ID
notificationManager.notify(notificationId, notificationBuilder.build());

Intent intent = new Intent(context, YourActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(
    context,
    (int) System.currentTimeMillis(), // 使用当前时间作为唯一请求码
    intent,
    PendingIntent.FLAG_UPDATE_CURRENT
);

Intent intent = new Intent(context, YourActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(
    context,
    0,
    intent,
    PendingIntent.FLAG_UPDATE_CURRENT
);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    NotificationChannel channel = new NotificationChannel(
        "your_channel_id",
        "Your Channel Name",
        NotificationManager.IMPORTANCE_DEFAULT
    );
    notificationManager.createNotificationChannel(channel);
}

NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "your_channel_id")
    .setSmallIcon(R.drawable.notification_icon)
    .setContentTitle("Title")
    .setContentText("Content")
    .setPriority(NotificationCompat.PRIORITY_DEFAULT)
    .setContentIntent(pendingIntent)
    .setAutoCancel(true);

Log.d("Notification", "Creating notification with ID: " + notificationId);