微信的聊天界面是挺漂亮的，每条消息都带一个气泡，，给人一种很清新的感觉，其实实现起来也不是那么的难，下面我们就来实现一下。
老规矩，先贴上源代码：
再来看一下实现的效果图：
OK，下面我们来看一下整个小项目的主体结构：
下面是Activity的代码：
package com.way.demo;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;/** * @author way */public class WeixinChatDemoActivity extends Activity implements OnClickListener {private Button mBtnSend;// 发送btnprivate Button mBtnBack;// 返回btnprivate EditText mEditTextContent;private ListView mListView;private ChatMsgViewAdapter mAdapter;// 消息视图的Adapterprivate List<ChatMsgEntity> mDataArrays = new ArrayList<ChatMsgEntity>();// 消息对象数组public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);initView();// 初始化viewinitData();// 初始化数据mListView.setSelection(mAdapter.getCount() – 1);}/** * 初始化view */public void initView() {mListView = (ListView) findViewById(R.id.listview);mBtnSend = (Button) findViewById(R.id.btn_send);mBtnSend.setOnClickListener(this);mBtnBack = (Button) findViewById(R.id.btn_back);mBtnBack.setOnClickListener(this);mEditTextContent = (EditText) findViewById(R.id.et_sendmessage);}private String[] msgArray = new String[] { "有大吗", "有！你呢？", "我也有", "那上吧","打啊！你放大啊！", "你TM咋不放大呢？留大抢人头啊？CAO！你个菜B", "2B不解释", "尼滚…","今晚去网吧包夜吧？", "有毛片吗？", "种子一大堆啊~还怕没片？", "OK,搞起！！" };private String[] dataArray = new String[] { "2012-09-22 18:00:02","2012-09-22 18:10:22", "2012-09-22 18:11:24","2012-09-22 18:20:23", "2012-09-22 18:30:31","2012-09-22 18:35:37", "2012-09-22 18:40:13","2012-09-22 18:50:26", "2012-09-22 18:52:57","2012-09-22 18:55:11", "2012-09-22 18:56:45","2012-09-22 18:57:33", };private final static int COUNT = 12;// 初始化数组总数/** * 模拟加载消息历史，实际开发可以从数据库中读出 */public void initData() {for (int i = 0; i < COUNT; i++) {ChatMsgEntity entity = new ChatMsgEntity();entity.setDate(dataArray[i]);if (i % 2 == 0) {entity.setName("肖B");entity.setMsgType(true);// 收到的消息} else {entity.setName("必败");entity.setMsgType(false);// 自己发送的消息}entity.setMessage(msgArray[i]);mDataArrays.add(entity);}mAdapter = new ChatMsgViewAdapter(this, mDataArrays);mListView.setAdapter(mAdapter);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn_send:// 发送按钮点击事件send();break;case R.id.btn_back:// 返回按钮点击事件finish();// 结束,实际开发中，可以返回主界面break;}}/** * 发送消息 */private void send() {String contString = mEditTextContent.getText().toString();if (contString.length() > 0) {ChatMsgEntity entity = new ChatMsgEntity();entity.setName("必败");entity.setDate(getDate());entity.setMessage(contString);entity.setMsgType(false);mDataArrays.add(entity);mAdapter.notifyDataSetChanged();// 通知ListView，数据已发生改变mEditTextContent.setText("");// 清空编辑框数据mListView.setSelection(mListView.getCount() – 1);// 发送一条消息时，ListView显示选择最后一项}}/** * 发送消息时，获取当前事件 ** @return 当前时间 */private String getDate() {SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");return format.format(new Date());}}
ListView的代码：
package com.way.demo;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;/** * 消息ListView的Adapter * * @author way */public class ChatMsgViewAdapter extends BaseAdapter {public static interface IMsgViewType {int IMVT_COM_MSG = 0;// 收到对方的消息int IMVT_TO_MSG = 1;// 自己发送出去的消息}private static final int ITEMCOUNT = 2;// 消息类型的总数private List<ChatMsgEntity> coll;// 消息对象数组private LayoutInflater mInflater;public ChatMsgViewAdapter(Context context, List<ChatMsgEntity> coll) {this.coll = coll;mInflater = LayoutInflater.from(context);}public int getCount() {return coll.size();}public Object getItem(int position) {return coll.get(position);}public long getItemId(int position) {return position;}/** * 得到Item的类型，是对方发过来的消息，还是自己发送出去的 */public int getItemViewType(int position) {ChatMsgEntity entity = coll.get(position);if (entity.getMsgType()) {//收到的消息return IMsgViewType.IMVT_COM_MSG;} else {//自己发送的消息return IMsgViewType.IMVT_TO_MSG;}}/** * Item类型的总数 */public int getViewTypeCount() {return ITEMCOUNT;}public View getView(int position, View convertView, ViewGroup parent) {ChatMsgEntity entity = coll.get(position);boolean isComMsg = entity.getMsgType();ViewHolder viewHolder = null;if (convertView == null) {if (isComMsg) {convertView = mInflater.inflate(R.layout.chatting_item_msg_text_left, null);} else {convertView = mInflater.inflate(R.layout.chatting_item_msg_text_right, null);}viewHolder = new ViewHolder();viewHolder.tvSendTime = (TextView) convertView.findViewById(R.id.tv_sendtime);viewHolder.tvUserName = (TextView) convertView.findViewById(R.id.tv_username);viewHolder.tvContent = (TextView) convertView.findViewById(R.id.tv_chatcontent);viewHolder.isComMsg = isComMsg;convertView.setTag(viewHolder);} else {viewHolder = (ViewHolder) convertView.getTag();}viewHolder.tvSendTime.setText(entity.getDate());viewHolder.tvUserName.setText(entity.getName());viewHolder.tvContent.setText(entity.getMessage());return convertView;}static class ViewHolder {public TextView tvSendTime;public TextView tvUserName;public TextView tvContent;public boolean isComMsg = true;}}让你的心情地落到极点，一直学习生活等各个方面都做不好，最终害的还是自己。
