环信UI开源Demo情景分析八、会话界面（补充）
仲高超
在介绍会话界面的时候忘记了一部分内容，关于会话列表的显示。ChatAllHistoryAdapter。
public class ChatAllHistoryAdapter extends ArrayAdapter<EMConversation> {
private LayoutInflater inflater;
private List<EMConversation> conversationList;
private List<EMConversation> copyConversationList;
private ConversationFilter conversationFilter;
private boolean notiyfyByFilter;
public ChatAllHistoryAdapter(Context context, int textViewResourceId, List<EMConversation> objects) {
super(context, textViewResourceId, objects);
this.conversationList = objects;
copyConversationList = new ArrayList<EMConversation>();
copyConversationList.addAll(objects);
inflater = LayoutInflater.from(context);
}这个Adapter继承自ArrayAdapter，在构造方法中赋值数据。
private static class ViewHolder {
/** 和谁的聊天记录 */
TextView name;
/** 消息未读数 */
TextView unreadLabel;
/** 最后一条消息的内容 */
TextView message;
/** 最后一条消息的时间 */
TextView time;
/** 用户头像 */
ImageView avatar;
/** 最后一条消息的发送状态 */
View msgState;
/** 整个list中每一行总布局 */
RelativeLayout list_item_layout;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.row_chat_history, parent, false);
}
ViewHolder holder = (ViewHolder) convertView.getTag();
if (holder == null) {
holder = new ViewHolder();
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.unreadLabel = (TextView) convertView.findViewById(R.id.unread_msg_number);
holder.message = (TextView) convertView.findViewById(R.id.message);
holder.time = (TextView) convertView.findViewById(R.id.time);
holder.avatar = (ImageView) convertView.findViewById(R.id.avatar);
holder.msgState = convertView.findViewById(R.id.msg_state);
holder.list_item_layout = (RelativeLayout) convertView.findViewById(R.id.list_item_layout);
convertView.setTag(holder);
}
if (position % 2 == 0) {
holder.list_item_layout.setBackgroundResource(R.drawable.mm_listitem);
} else {
holder.list_item_layout.setBackgroundResource(R.drawable.mm_listitem_grey);
}
// 获取与此用户/群组的会话
EMConversation conversation = getItem(position);
// 获取用户username或者群组groupid
String username = conversation.getUserName();
List<EMGroup> groups = EMGroupManager.getInstance().getAllGroups();
EMContact contact = null;
boolean isGroup = false;
for (EMGroup group : groups) {
if (group.getGroupId().equals(username)) {
isGroup = true;
contact = group;
break;
}
}
if (isGroup) {
// 群聊消息，显示群聊头像
holder.avatar.setImageResource(R.drawable.group_icon);
holder.name.setText(contact.getNick() != null ? contact.getNick() : username);
} else {
UserUtils.setUserAvatar(getContext(), username, holder.avatar);
if (username.equals(Constant.GROUP_USERNAME)) {
holder.name.setText("群聊");
} else if (username.equals(Constant.NEW_FRIENDS_USERNAME)) {
holder.name.setText("申请与通知");
}
holder.name.setText(username);
}
if (conversation.getUnreadMsgCount() > 0) {
// 显示与此用户的消息未读数
holder.unreadLabel.setText(String.valueOf(conversation.getUnreadMsgCount()));
holder.unreadLabel.setVisibility(View.VISIBLE);
} else {
holder.unreadLabel.setVisibility(View.INVISIBLE);
}
if (conversation.getMsgCount() != 0) {
// 把最后一条消息的内容作为item的message内容
EMMessage lastMessage = conversation.getLastMessage();
holder.message.setText(SmileUtils.getSmiledText(getContext(), getMessageDigest(lastMessage, (this.getContext()))), BufferType.SPANNABLE);
holder.time.setText(DateUtils.getTimestampString(new Date(lastMessage.getMsgTime())));
if (lastMessage.direct == EMMessage.Direct.SEND && lastMessage.status == EMMessage.Status.FAIL) {
holder.msgState.setVisibility(View.VISIBLE);
} else {
holder.msgState.setVisibility(View.GONE);
}
}
return convertView;
}
/**
* 设置用户头像
* @param username
*/
public static void setUserAvatar(Context context, String username, ImageView imageView){
User user = getUserInfo(username);
if(user != null){
Picasso.with(context).load(user.getAvatar()).placeholder(R.drawable.default_avatar).into(imageView);
}else{
Picasso.with(context).load(R.drawable.default_avatar).into(imageView);
}
}
/**
* 根据消息内容和消息类型获取消息内容提示
*
* @param message
* @param context
* @return
*/
private String getMessageDigest(EMMessage message, Context context) {
String digest = "";
switch (message.getType()) {
case LOCATION: // 位置消息
if (message.direct == EMMessage.Direct.RECEIVE) {
// 从sdk中提到了ui中，使用更简单不犯错的获取string的方法
// digest = EasyUtils.getAppResourceString(context,
// "location_recv");
digest = getStrng(context, R.string.location_recv);
digest = String.format(digest, message.getFrom());
return digest;
} else {
// digest = EasyUtils.getAppResourceString(context,
// "location_prefix");
digest = getStrng(context, R.string.location_prefix);
}
break;
case IMAGE: // 图片消息
ImageMessageBody imageBody = (ImageMessageBody) message.getBody();
digest = getStrng(context, R.string.picture) + imageBody.getFileName();
break;
case VOICE:// 语音消息
digest = getStrng(context, R.string.voice);
break;
case VIDEO: // 视频消息
digest = getStrng(context, R.string.video);
break;
case TXT: // 文本消息
if (!message.getBooleanAttribute(Constant.MESSAGE_ATTR_IS_VOICE_CALL, false)) {
TextMessageBody txtBody = (TextMessageBody) message.getBody();
digest = txtBody.getMessage();
} else {
TextMessageBody txtBody = (TextMessageBody) message.getBody();
digest = getStrng(context, R.string.voice_call) + txtBody.getMessage();
}
break;
case FILE: // 普通文件消息
digest = getStrng(context, R.string.file);
break;
default:
System.err.println("error, unknow type");
return "";
}
return digest;
}其中有一点需要注意，在实现的方法中需要重写
@Override
public Filter getFilter() {
if (conversationFilter == null) {
conversationFilter = new ConversationFilter(conversationList);
}
return conversationFilter;
}
private class ConversationFilter extends Filter {
List<EMConversation> mOriginalValues = null;
public ConversationFilter(List<EMConversation> mList) {
mOriginalValues = mList;
}
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<EMConversation>();
}
if (prefix == null || prefix.length() == 0) {
results.values = copyConversationList;
results.count = copyConversationList.size();
} else {
String prefixString = prefix.toString();
final int count = mOriginalValues.size();
final ArrayList<EMConversation> newValues = new ArrayList<EMConversation>();
for (int i = 0; i < count; i++) {
final EMConversation value = mOriginalValues.get(i);
String username = value.getUserName();
EMGroup group = EMGroupManager.getInstance().getGroup(username);
if (group != null) {
username = group.getGroupName();
}
// First match against the whole ,non-splitted value
if (username.startsWith(prefixString)) {
newValues.add(value);
} else {
final String[] words = username.split(" ");
final int wordCount = words.length;
// Start at index 0, in case valueText starts with
// space(s)
for (int k = 0; k < wordCount; k++) {
if (words[k].startsWith(prefixString)) {
newValues.add(value);
break;
}
}
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
conversationList.clear();
conversationList.addAll((List<EMConversation>) results.values);
if (results.count > 0) {
notiyfyByFilter = true;
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}用来实现查询功能。
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
if (!notiyfyByFilter) {
copyConversationList.clear();
copyConversationList.addAll(conversationList);
notiyfyByFilter = false;
}
}最后完成数据的更新方法。
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