最近，公司項目內建了環信即時通訊，提出一個需求：分享app内文章資訊進環信群。先上個效果圖（UI我随便放的，大家湊活看** — **）：
先放上參考文章連結：https://www.jianshu.com/p/0692396f2fbe，在這裡先感謝作者！在這篇文章裡作者是通過在EaseChatExtendMenu 擴充，注冊item的方式實作的發送名片功能，具體的大家可以看這篇文章。
我這裡其實跟參考文章的原理是一樣的，也是通過擴充消息的方式，自定義一個消息類型，通過發送text文本消息，自定義了消息UI，下面是實作步驟：
一、首先自定義擴充字段：
public class NewsConstant {
public static final String newsExtType = "newsExtType";//資訊資訊擴充
public static final String newsId = "newsId";//資訊資訊ID
public static final String newsTitle = "newsTitle";//資訊标題
public static final String newsDesc = "newsDesc";//資訊資訊小文字描述
public static final String newsImgUrl = "newsImgUrl";//資訊圖檔
} 二、在ChatFragment中定義發送資訊消息和接收資訊消息的辨別符，去CustomChatRowProvider内部類中設定接收和發送資訊消息：
1、在ChatFragment中定義發送資訊消息和接收資訊消息的辨別符：
private static final int MESSAGE_TYPE_RECV_NEWS = 5;
private static final int MESSAGE_TYPE_SEND_NEWS = 6; 2、去CustomChatRowProvider内部類中設定接收和發送資訊消息：
private final class CustomChatRowProvider implements EaseCustomChatRowProvider {
@Override
public int getCustomChatRowTypeCount() {
//here the number is the message type in EMMessage::Type
//which is used to count the number of different chat row
return 13;
}
@Override
public int getCustomChatRowType(EMMessage message) {
if (message.getType() == EMMessage.Type.TXT) {
//voice call
if (message.getBooleanAttribute(Constant.MESSAGE_ATTR_IS_VOICE_CALL, false)) {
return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_VOICE_CALL : MESSAGE_TYPE_SENT_VOICE_CALL;
} else if (message.getBooleanAttribute(Constant.MESSAGE_ATTR_IS_VIDEO_CALL, false)) {
//video call
return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_VIDEO_CALL : MESSAGE_TYPE_SENT_VIDEO_CALL;
}
//messagee recall
else if (message.getBooleanAttribute(Constant.MESSAGE_TYPE_RECALL, false)) {
return MESSAGE_TYPE_RECALL;
} else try {
if ("1".equals(message.getStringAttribute(NewsConstant.newsExtType))) {
return message.direct() == EMMessage.Direct.RECEIVE ? ChatFragment.MESSAGE_TYPE_RECV_NEWS : ChatFragment.MESSAGE_TYPE_SEND_NEWS;
}
} catch (HyphenateException e) {
e.printStackTrace();
}
}
return 0;
}
@Override
public EaseChatRowPresenter getCustomChatRow(EMMessage message, int position, BaseAdapter adapter) {
if (message.getType() == EMMessage.Type.TXT) {
if (message.getBooleanAttribute(Constant.MESSAGE_TYPE_RECALL, false)) {
EaseChatRowPresenter presenter = new EaseChatRecallPresenter();
return presenter;
} else try {
if ("1".equals(message.getStringAttribute(NewsConstant.newsExtType))) {
//發送資訊資訊卡片
return new EaseChatNewsCallPresenter();
}
} catch (HyphenateException e) {
e.printStackTrace();
}
}
return null;
}
} 注意：在getCustomChatRowTypeCount（）方法中，傳回值記得加2，代表發送和接收資訊消息
如果想設定消息的點選事件，可以在onMessageBubbleClick（）方法中實作：
@Override
public boolean onMessageBubbleClick(EMMessage message) {
try {
//點選資訊消息事件
if ("1".equals(message.getStringAttribute(NewsConstant.newsExtType))) {
Intent intent = new Intent(getActivity(), ArticleDetailsActivity.class);
intent.putExtra("newsId", Integer.parseInt(message.getStringAttribute(NewsConstant.newsId)));
startActivity(intent);
return true;
}
} catch (HyphenateException e) {
e.printStackTrace();
}
return false;
} 三、自定義EaseChatNewsCallPresenter:
public class EaseChatNewsCallPresenter extends EaseChatRowPresenter {
@Override
protected EaseChatRow onCreateChatRow(Context cxt, EMMessage message, int position, BaseAdapter adapter) {
return new NewsChatRow(cxt, message, position, adapter);
}
} 四、非常重要！！！自定義NewsChatRow，也就是擴充消息的載體：
public class NewsChatRow extends EaseChatRow {
private TextView title, desc;
private ImageView img;
public NewsChatRow(Context context, EMMessage message, int position, BaseAdapter adapter) {
super(context, message, position, adapter);
}
/*
填充layout
*/
@Override
protected void onInflateView() {
inflater.inflate(message.direct() == EMMessage.Direct.RECEIVE ?
R.layout.ease_row_received_news_call : R.layout.ease_row_send_news_call, this);
}
/*
查找chatrow中的控件
*/
@Override
protected void onFindViewById() {
title = (TextView) findViewById(R.id.news_card_title);
desc = (TextView) findViewById(R.id.news_card_desc);
img = (ImageView) findViewById(R.id.news_card_img);
}
/*
消息狀态改變，重新整理listView
*/
@Override
protected void onViewUpdate(EMMessage msg) {
switch (msg.status()) {
case CREATE:
onMessageCreate();
break;
case SUCCESS:
onMessageSuccess();
break;
case FAIL:
onMessageError();
break;
case INPROGRESS:
onMessageInProgress();
break;
}
// adapter.notifyDataSetChanged();
}
@Override
protected void onSetUpView() {
EMTextMessageBody textMessageBody = (EMTextMessageBody) message.getBody();
if (message.direct()== EMMessage.Direct.RECEIVE){
LogUtils.e(textMessageBody.getMessage());
}
// message.getStringAttribute(NewsConstant.newsExtType, null);
String titleStr = message.getStringAttribute(NewsConstant.newsTitle, null);
String descStr = message.getStringAttribute(NewsConstant.newsDesc, null);
String imgurlStr = message.getStringAttribute(NewsConstant.newsImgUrl, null);
if (!TextUtils.isEmpty(titleStr))
title.setText(titleStr);
if (!TextUtils.isEmpty(descStr))
desc.setText(descStr);
Glide.with(context)
.load(imgurlStr)
.error(R.drawable.icon_logo)
.placeholder(R.drawable.loading_img)
.crossFade()
.into(img);
}
private void onMessageCreate() {
progressBar.setVisibility(View.VISIBLE);
statusView.setVisibility(View.GONE);
}
private void onMessageSuccess() {
progressBar.setVisibility(View.GONE);
statusView.setVisibility(View.GONE);
}
private void onMessageError() {
progressBar.setVisibility(View.GONE);
statusView.setVisibility(View.VISIBLE);
}
private void onMessageInProgress() {
progressBar.setVisibility(View.VISIBLE);
statusView.setVisibility(View.GONE);
}
} 到這裡用擴充消息實作發送資訊進群的功能基本就實作了，下面就是分享資訊消息進群了：
發送資訊消息事件：
EMMessage message = EMMessage.createTxtSendMessage("[分享]" + mainActivity.getData("newsTitle")
, username);
message.setAttribute(NewsConstant.newsExtType, "1");//設定擴充字段
message.setAttribute(NewsConstant.newsTitle, mainActivity.getData("newsTitle"));//将title設定到擴充字段
message.setAttribute(NewsConstant.newsImgUrl, mainActivity.getData("newsImg"));//将imgUrl設定到擴充字段
message.setAttribute(NewsConstant.newsId, mainActivity.getData("newsId"));//将newsId設定到擴充字段
message.setAttribute(NewsConstant.newsDesc, mainActivity.getData("newsDesc"));//将desc設定到擴充字段
Intent intent = new Intent(getActivity(), ChatActivity.class);
if (conversation.isGroup()) {
if (conversation.getType() == EMConversation.EMConversationType.ChatRoom) {
// it's group chat
message.setChatType(EMMessage.ChatType.ChatRoom);
intent.putExtra(Constant.EXTRA_CHAT_TYPE, Constant.CHATTYPE_CHATROOM);
} else {
message.setChatType(EMMessage.ChatType.GroupChat);//注意：這行代碼一定不要忘記，環信預設消息的類型是單聊，這行代碼是改成群聊消息類型，否則會導緻群聊消息接收不到
intent.putExtra(Constant.EXTRA_CHAT_TYPE, Constant.CHATTYPE_GROUP);
}
}
// it's single chat
intent.putExtra(Constant.EXTRA_USER_ID, username);
EMClient.getInstance().chatManager().sendMessage(message);
startActivity(intent); 注意：自定義擴充消息的字段名一定要跟IOS小夥伴的一緻！！！
到這裡擴充消息分享就完成了，有需要的童鞋可以看看
