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我正在使用数据包侦听器在我的应用程序（ xmpp chat ）中实现通知。

直到第一个通知出现，代码工作正常，但是一旦人们点击通知，然后在第一次点击之后（ if 和 else ）的代码都用完了。我无法获得解决方案，而且它也很奇怪，IF/ELSE 代码如何运行 - 在第一次通知点击之后。

代码

PacketFilter filter = new MessageTypeFilter(Message.Type.chat);
        final PacketCollector collector = connection.createPacketCollector(filter);
        connection.addPacketListener(new PacketListener() {
            public void processPacket(Packet packetChat) {
                Message message = (Message) packetChat;
                packetChat = collector.nextResult();

                if (message.getBody() != null) {

                    fromName = StringUtils.parseBareAddress(message
                            .getFrom());
                    Log.i("XMPPClient", "Got text [" + message.getBody()
                            + "] from [" + fromName + "]");
                    // messages.add(fromName + ":");
                    mMessageItem = new MessageItemDataClass();
                    mMessageItem.isSendMessage = false;
                    mMessageItem.messageText = message.getBody();
                    messages.add(mMessageItem);


                    //to add the packet message in the layout only when the user is on the same friend's screen
                    //for anonymous chat
                    if(packetChat.getFrom().equalsIgnoreCase(refineFromjId(frienduserID)+"/Smack")){



                        messages.add(mMessageItem);
                    }
                    else{
                        if(checkPresence=true){
                        notificationforChat(fromName.substring(0,fromName.indexOf("@"))+":1212 "+message.getBody(),packetChat.getFrom(),0);
                        }
                    }

                    //messages.add(mMessageItem);
                    // Add the incoming message to the list view
                    mHandler.post(new Runnable() {
                        public void run() {
                            //simply turn around to the last of the screen
                            mList.setSelection(mList.getCount());

                            lastIndex = mList.getLastVisiblePosition()+1;
                            if (mList.getFirstVisiblePosition() > lastIndex || mList.getLastVisiblePosition() <= lastIndex) {
                                //mList.smoothScrollToPosition(lastIndex);
                                customAdapter.notifyDataSetChanged();
                                mList.setSelection(mList.getCount());

                                dbhHelper.close();

                            }else{
                                mList.setSelection(mList.getCount());
                                customAdapter.notifyDataSetChanged();

                                dbhHelper.close();

                            }
                        }
                    });
                }
            }               
        }, filter);

通知

public void notificationforChat(CharSequence message,String toJid, int notificationID) {

        int notificationCount = 1;
        String ns = Context.NOTIFICATION_SERVICE;
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
        int icon = R.drawable.ic_launcher;
        CharSequence tickerText = message;
        long when = System.currentTimeMillis();
        Notification notification = new Notification(icon, tickerText, when);
        //notification.number = notificationCount++;
        Context context = getApplicationContext();



        CharSequence contentTitle = "Chat";
        CharSequence contentText = message;
        Intent notificationIntentforChat = new Intent(this, UserChatActivity.class);
        notificationIntentforChat.putExtra("userNameVal", toJid);       
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                notificationIntentforChat, PendingIntent.FLAG_UPDATE_CURRENT);
        notification.setLatestEventInfo(context, contentTitle, contentText,
                contentIntent);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notification.defaults = Notification.DEFAULT_ALL;   
        mNotificationManager.notify(notificationID, notification);
    }

如果有人可以，请帮助我！谢谢

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1 回答 1

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您的函数可能会在不同的条件下同时被多次调用（可能是两次）......所以您会感觉到 if 和 else 被调用。尝试使用一个标志来限制代码块被执行的次数，或者设置一个计数器来检查代码块是否被执行了多次。将您计划使用的计数器或标志变量设为静态，以便您可以检测到来自您可能在不知不觉中创建的不同实例的调用。

于 2012-11-16T04:38:53.067 回答