环信自定义消息置顶功能

我在开发中发现没有消息置顶这个功能，然后我公司要求开发个消息置顶的功能，所以就的手动写了。环信好多功能都要自己写，消息撤回，文件夹等等

思路

我就想能不能在每个消息里面设置个标识，来区分是否是置顶的消息，然后我找了下消息实体类EMConversation。其中就有两个方法getExtField()和setExtField(“”)，反正我也不管这是什么方法发，反正我就能存能取就够了。哈哈。。。

主要方法

1、getExtField();
2、setExtField(“”)

2017-06-30_151924.png

2017-06-30_152028.png

开始实战

1. 在你要添加的置顶方法，我的是ConversationListFragment类中setUpView()方法中定义的侧滑按钮
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//置顶消息
       EMConversation tobeDeleteCons = (EMConversation)conversationListView.getItemAtPosition(conversationListView.getPositionForView(view));
       String isTop = tobeDeleteCons.getExtField();
           //判断是否是置顶消息  
       if("toTop".equals(isTop)){
          //取消置顶，就设置为其他的字符串
           tobeDeleteCons.setExtField("false");
       }else {
           //把它设置为置顶的标识
           tobeDeleteCons.setExtField("toTop");
       }
       //刷新消息列表
       refresh();
2.找到数据源在添加消息前添加进列表中。我的是EaseConversationListFragment中setUpView()方法，
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conversationList.addAll(loadConversationList());
       conversationListView.init(conversationList);

这个是主要方法

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/**
    * load conversation list
    * 
    * @return
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       +    */
   protected List<EMConversation> loadConversationList(){
       // get all conversations
       Map<String, EMConversation> conversations = EMClient.getInstance().chatManager().getAllConversations();
       onHandleEMConversation(conversations);
       //添加置顶消息
       List<Pair<Long, EMConversation>> topList = new ArrayList<Pair<Long, EMConversation>>();
       synchronized (conversations) {
           for (EMConversation conversation : conversations.values()) {
               if (conversation.getAllMessages().size() != 0 && conversation.getExtField().equals("toTop")) {
                   topList.add(new Pair<Long, EMConversation>(conversation.getLastMessage().getMsgTime(), conversation));
               }
           }
       }
       List<Pair<Long, EMConversation>> sortList = new ArrayList<Pair<Long, EMConversation>>();
       /**
        * lastMsgTime will change if there is new message during sorting
        * so use synchronized to make sure timestamp of last message won't change.
        */
       synchronized (conversations) {
           for (EMConversation conversation : conversations.values()) {
               if (conversation.getAllMessages().size() != 0 && !conversation.getExtField().equals("toTop")) {
                   sortList.add(new Pair<Long, EMConversation>(conversation.getLastMessage().getMsgTime(), conversation));
               }
           }
       }
       try {
           // Internal is TimSort algorithm, has bug
           sortConversationByLastChatTime(sortList);
       } catch (Exception e) {
           e.printStackTrace();
       }
       List<EMConversation> list = new ArrayList<EMConversation>();
       //添加置顶消息
       for (Pair<Long, EMConversation> topItem : topList) {
           list.add(topItem.second);
       }
       for (Pair<Long, EMConversation> sortItem : sortList) {
           list.add(sortItem.second);
       }
       return list;
   }
3.在EaseConversationAdapter中加上一些信息
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EMConversation conversation = getItem(position);
       //判断是否置顶，置顶改变文字
       String isTop = conversation.getExtField();
       if("toTop".equals(isTop)){
           holder.btnToTop.setText("取消置顶");
           holder.list_itease_layout.setBackgroundResource(R.drawable.ease_mm_top_listitem);
       }else {
           holder.btnToTop.setText("置顶");
           holder.list_itease_layout.setBackgroundResource(R.drawable.ease_mm_listitem);
       }

到此就改造好了