tt程序分析（一）

// 这个地方跳转一定要快
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {

    RecentInfo recentInfo = contactAdapter.getItem(position);
    if (recentInfo == null) {
        logger.e("recent#null recentInfo -> position:%d", position);
        return;
    }
   IMUIHelper.openChatActivity(getActivity(),recentInfo.getSessionKey());
}

// 跳转到聊天页面
public static void openChatActivity(Context ctx, String sessionKey) {
    Intent intent = new Intent(ctx, MessageActivity.class);
    intent.putExtra(IntentConstant.KEY_SESSION_KEY, sessionKey);
    ctx.startActivity(intent);
}

case R.id.send_message_btn: {
    logger.d("message_activity#send btn clicked");

    String content = messageEdt.getText().toString();
    logger.d("message_activity#chat content:%s", content);
    if (content.trim().equals("")) {
        Toast.makeText(MessageActivity.this,
                getResources().getString(R.string.message_null), Toast.LENGTH_LONG).show();
        return;
    }
    TextMessage textMessage = TextMessage.buildForSend(content, loginUser, peerEntity);
    imService.getMessageManager().sendText(textMessage);
    messageEdt.setText("");
    pushList(textMessage);
    scrollToBottomListItem();
}

public void pushList(MessageEntity msg) {
    logger.d("chat#pushList msgInfo:%s", msg);
    adapter.addItem(msg);
}

/**
 * ----------------------添加历史消息-----------------
 */
public void addItem(final MessageEntity msg) {
    if (msg.getDisplayType() == DBConstant.MSG_TYPE_SINGLE_TEXT) {
        if (isMsgGif(msg)) {
            msg.setGIfEmo(true);
        } else {
            msg.setGIfEmo(false);
        }
    }
    int nextTime = msg.getCreated();
    if (getCount() > 0) {
        Object object = msgObjectList.get(getCount() - 1);
        if (object instanceof MessageEntity) {
            int preTime = ((MessageEntity) object).getCreated();
            boolean needTime = DateUtil.needDisplayTime(preTime, nextTime);
            if (needTime) {
                Integer in = nextTime;
                msgObjectList.add(in);
            }
        }
    } else {
        Integer in = msg.getCreated();
        msgObjectList.add(in);
    }
    /**消息的判断*/
    if (msg.getDisplayType() == DBConstant.SHOW_MIX_TEXT) {
        MixMessage mixMessage = (MixMessage) msg;
        msgObjectList.addAll(mixMessage.getMsgList());
    } else {
        msgObjectList.add(msg);
    }
    if (msg instanceof ImageMessage) {
        ImageMessage.addToImageMessageList((ImageMessage) msg);
    }
    logger.d("#messageAdapter#addItem");
    notifyDataSetChanged();

}

/**
 * @Description 滑动到列表底部
 */
private void scrollToBottomListItem() {
    logger.d("message_activity#scrollToBottomListItem");

    // todo eric, why use the last one index + 2 can real scroll to the
    // bottom?
    ListView lv = lvPTR.getRefreshableView();
    if (lv != null) {
        lv.setSelection(adapter.getCount() + 1);
    }
    textView_new_msg_tip.setVisibility(View.GONE);
}

public void loadHistoryList(final List<MessageEntity> historyList) {
    logger.d("#messageAdapter#loadHistoryList");
    if (null == historyList || historyList.size() <= 0) {
        return;
    }
    Collections.sort(historyList, new MessageTimeComparator());
    ArrayList<Object> chatList = new ArrayList<>();
    int preTime = 0;
    int nextTime = 0;
    for (MessageEntity msg : historyList) {
        if (msg.getDisplayType() == DBConstant.MSG_TYPE_SINGLE_TEXT) {
            if (isMsgGif(msg)) {
                msg.setGIfEmo(true);
            } else {
                msg.setGIfEmo(false);
            }
        }
        nextTime = msg.getCreated();
        boolean needTimeBubble = DateUtil.needDisplayTime(preTime, nextTime);
        if (needTimeBubble) {
            Integer in = nextTime;
            chatList.add(in);
        }
        preTime = nextTime;
        if (msg.getDisplayType() == DBConstant.SHOW_MIX_TEXT) {
            MixMessage mixMessage = (MixMessage) msg;
            chatList.addAll(mixMessage.getMsgList());
        } else {
            chatList.add(msg);
        }
    }
    // 如果是历史消息，从头开始加
    msgObjectList.addAll(0, chatList);
    getImageList();
    logger.d("#messageAdapter#addItem");
    notifyDataSetChanged();
}

private void initData() {
    historyTimes = 0;
    adapter.clearItem();
    ImageMessage.clearImageMessageList();
    loginUser = imService.getLoginManager().getLoginInfo();
    peerEntity = imService.getSessionManager().findPeerEntity(currentSessionKey);
    // 头像、历史消息加载、取消通知
    setTitleByUser();
    reqHistoryMsg();
    adapter.setImService(imService, loginUser);
    imService.getUnReadMsgManager().readUnreadSession(currentSessionKey);
    imService.getNotificationManager().cancelSessionNotifications(currentSessionKey);
}

/**
 * 1.初始化请求历史消息
 * 2.本地消息不全，也会触发
 */
private void reqHistoryMsg() {
    historyTimes++;
    List<MessageEntity> msgList = imService.getMessageManager().loadHistoryMsg(historyTimes,currentSessionKey,peerEntity);
    pushList(msgList);
    scrollToBottomListItem();
}

public void pushList(List<MessageEntity> entityList) {
    logger.d("chat#pushList list:%d", entityList.size());
    adapter.loadHistoryList(entityList);
}

private void reqHistoryMsg() {
    historyTimes++;
    List<MessageEntity> msgList = imService.getMessageManager().loadHistoryMsg(historyTimes,currentSessionKey,peerEntity);
    Log.d("messageActivity","size  "+msgList.size()+ " list "+msgList.toString()+"imservice"+imService.toString());
    pushList(msgList);

    scrollToBottomListItem();
}