Flutter高仿微信系列共59篇，从Flutter客户端、Kotlin客户端、Web服务器、数据库表结构、Xmpp即时通讯服务器、视频通话服务器、腾讯云服务器全面讲解。

 详情请查看

效果图：

详情请参考 Flutter高仿微信-第29篇-单聊 ， 这里只是提取表情实现的部分代码。

实现代码：

//Emoji表情控件
Widget getEmojiWidget(){
  return SizedBox(
    height: 200.0,
    width: 1000.0,
    child: EmojiPicker(
        onEmojiSelected: (Category category, Emoji emoji) {
          _onEmojiSelected(emoji);
        },
        onBackspacePressed: _onBackspacePressed,
        config: const Config(
            columns: 7,
            emojiSizeMax: 25.0,
            verticalSpacing: 0,
            horizontalSpacing: 0,
            initCategory: Category.RECENT,
            bgColor: Color(0xFFF2F2F2),
            indicatorColor: Color(0xff65DAC5),
            iconColor: Colors.orange,
            iconColorSelected: Color(0xff65DAC5),
            progressIndicatorColor: Color(0xff65DAC5),
            backspaceColor: Color(0xff65DAC5),
            showRecentsTab: true,
            recentsLimit: 28,
            categoryIcons: CategoryIcons(),
            buttonMode: ButtonMode.MATERIAL)),
  );
}

///选中表情
_onEmojiSelected(Emoji emoji) {
  controller
    ..text += emoji.emoji
    ..selection = TextSelection.fromPosition(TextPosition(offset: controller.text.length));
  hideAddIcon = true;
  hideSend = false;
  setState(() {
  });
}

///表情删除按钮
_onBackspacePressed() {
  controller
    ..text = controller.text.characters.skipLast(1).toString()
    ..selection = TextSelection.fromPosition(
        TextPosition(offset: controller.text.length));
  if (controller.text.isNotEmpty) {
    setState(() {
    });
  }
}

Emoji跟显示文本一样：

//我的文本
Widget meTextWidget(){
  return Column(
    // Column被Expanded包裹起来，使其内部文本可自动换行
    crossAxisAlignment: CrossAxisAlignment.end,
    children: <Widget>[
      Container(
        padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 10.0),
        decoration: BoxDecoration(borderRadius: BorderRadius.all(Radius.circular(5.0),),color: Color(0xFF9EEA6A),),
        child: Text(
          widget.chatBean.content??"",
          textAlign: TextAlign.left,
          style: TextStyle(color: Colors.black, fontSize: 20.0),
        ),
      )
    ],
  );
}

//朋友的文本
Widget toTextWidget(){
  return Column(
    crossAxisAlignment: CrossAxisAlignment.start,
    children: <Widget>[
      Container(
        padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 10.0),
        decoration: BoxDecoration(borderRadius: BorderRadius.all(Radius.circular(5.0),),color: Color(0xFFEDEDED)),
        child: Text(
          widget.chatBean.content??"",
          textAlign: TextAlign.left,
          style: TextStyle(color: Colors.black, fontSize: 20.0),
        ),
      )
    ],
  );
}

发送消息：

//定义发送表情事件的处理函数
void _handleSubmitted(String text) async {
  if (text.length > 0) {

    bool isNetwork = await CommonNetwork.isNetwork();
    if(!isNetwork) {
      CommonUtils.showNetworkError(context);
      return;
    }

    bool deleteContacts = await isDeleteContacts(widget.account, widget.toChatId);
    if(deleteContacts){
      WnBaseDialog.showAddFriendsDialog(context, widget.toChatId);
      return;
    }

    int contentType = CommonUtils.CHAT_CONTENT_TYPE_TEXT;
    String addTime = WnDateUtils.getCurrentTime();
    String messageId = UUID.getUUID();
    ChatSendBean chatSendBean = ChatSendBean();
    chatSendBean.contentType = contentType;
    chatSendBean.content = text;
    chatSendBean.addTime = addTime;
    chatSendBean.second = 0;
    chatSendBean.messageId = messageId;
    String message = jsonEncode(chatSendBean);

    _sendMessage(message);
    controller.clear(); //清空输入框
    ChatBean chatBean = ChatBean(fromAccount: widget.account, toAccount: widget.toChatId, content: text,contentType: contentType, addTime: addTime, isRead: 1, messageId: messageId);
    LogUtils.d("插入数据：${chatBean.toJson()}");
    //状态变更，向聊天记录中插入新记录
    setState(() {
      hideAddIcon = false;
      hideSend = true;
      items.add(chatBean);
    });
    await ChatRepository.getInstance().insertChat(chatBean);
    jumpToBottom(100);
  }
}

//发送消息
_sendMessage(var message){
  int id = DateTime.now().millisecondsSinceEpoch;
  String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);
  String toJid = "${widget.toChatId}@wangning";
  XmppManager.getInstance().sendMessageWithType(toJid, message, "$account", id);
  Map<String, Object> result = HashMap<String, Object>();
  eventBus.emit(BaseEvent(BaseEvent.TYPE_NEW_MESSAGE, result: result));
}