Android仿微信气泡聊天界面设计

Android仿微信气泡聊天界面设计

2013-08-01 11:01:25     我来说两句       作者：PocoyoShamoo

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微信的气泡聊天是仿iPhone自带短信而设计出来的，不过感觉还不错可以尝试一下仿着微信的气泡聊天做一个Demo，给大家分享一下！效果图如下：

 
 

  气泡聊天最终要的是素材，要用到9.png文件的素材，这样气泡会随着聊天内容的多少而改变气泡的大小且不失真。为了方便，我就直接在微信里面提取出来啦。

 

  聊天的内容是用ListView来显示的，将聊天的内容封装成一个ChatMsgEntity类的对象里面，然后交给自定义的ListView适配器将聊天内容显示出来。

  ChatMsgEntity.java比较简单，只是聊天的内容存储、设置和获取。

[java]
package com.example.school; 
 
public class ChatMsgEntity { 
    private static final String TAG = ChatMsgEntity.class.getSimpleName(); 
    //名字  
    private String name; 
    //日期  
    private String date; 
    //聊天内容  
    private String text; 
    //是否为对方发来的信息  
    private boolean isComMeg = true; 
 
    public String getName() { 
        return name; 
    } 
 
    public void setName(String name) { 
        this.name = name; 
    } 
 
    public String getDate() { 
        return date; 
    } 
 
    public void setDate(String date) { 
        this.date = date; 
    } 
 
    public String getText() { 
        return text; 
    } 
 
    public void setText(String text) { 
        this.text = text; 
    } 
 
    public boolean getMsgType() { 
        return isComMeg; 
    } 
 
    public void setMsgType(boolean isComMsg) { 
        isComMeg = isComMsg; 
    } 
 
    public ChatMsgEntity() { 
    } 
 
    public ChatMsgEntity(String name, String date, String text, boolean isComMsg) { 
        this.name = name; 
        this.date = date; 
        this.text = text; 
        this.isComMeg = isComMsg; 
    } 
} 

package com.example.school;

public class ChatMsgEntity {
    private static final String TAG = ChatMsgEntity.class.getSimpleName();
    //名字
    private String name;
    //日期
    private String date;
    //聊天内容
    private String text;
    //是否为对方发来的信息
    private boolean isComMeg = true;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public boolean getMsgType() {
        return isComMeg;
    }

    public void setMsgType(boolean isComMsg) {
     isComMeg = isComMsg;
    }

    public ChatMsgEntity() {
    }

    public ChatMsgEntity(String name, String date, String text, boolean isComMsg) {
        this.name = name;
        this.date = date;
        this.text = text;
        this.isComMeg = isComMsg;
    }
}

  显示ListView的适配器ChatMsgViewAdpater.java:

[java]
package com.example.school; 
 
import android.R.integer; 
import android.content.Context; 
import android.database.DataSetObserver; 
 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.View.OnLongClickListener; 
import android.view.ViewGroup; 
 
import android.widget.BaseAdapter; 
import android.widget.CheckBox; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
 
import java.util.ArrayList; 
import java.util.List; 
 
public class ChatMsgViewAdapter extends BaseAdapter { 
     
    //ListView视图的内容由IMsgViewType决定  
    public static interface IMsgViewType 
    { 
        //对方发来的信息  
        int IMVT_COM_MSG = 0; 
        //自己发出的信息  
        int IMVT_TO_MSG = 1; 
    } 
     
    private static final String TAG = ChatMsgViewAdapter.class.getSimpleName(); 
    private List<ChatMsgEntity> data; 
    private Context context;   
    private LayoutInflater mInflater; 
 
    public ChatMsgViewAdapter(Context context, List<ChatMsgEntity> data) { 
        this.context = context; 
        this.data = data; 
        mInflater = LayoutInflater.from(context); 
    } 
 
    //获取ListView的项个数  
    public int getCount() { 
        return data.size(); 
    } 
 
    //获取项  
    public Object getItem(int position) { 
        return data.get(position); 
    } 
 
    //获取项的ID  
    public long getItemId(int position) { 
        return position; 
    } 
 
    //获取项的类型  
    public int getItemViewType(int position) { 
        // TODO Auto-generated method stub  
        ChatMsgEntity entity = data.get(position); 
         
        if (entity.getMsgType()) 
        { 
            return IMsgViewType.IMVT_COM_MSG; 
        }else{ 
            return IMsgViewType.IMVT_TO_MSG; 
        } 
         
    } 
 
    //获取项的类型数  
    public int getViewTypeCount() { 
        // TODO Auto-generated method stub  
        return 2; 
    } 
     
    //获取View  
    public View getView(int position, View convertView, ViewGroup parent) { 
         
        ChatMsgEntity entity = data.get(position); 
        boolean isComMsg = entity.getMsgType(); 
             
        ViewHolder viewHolder = null;    
        if (convertView == null) 
        { 
              if (isComMsg) 
              { 
                  //如果是对方发来的消息，则显示的是左气泡  
                  convertView = mInflater.inflate(R.layout.chatting_item_msg_text_left, null); 
              }else{ 
                  //如果是自己发出的消息，则显示的是右气泡  
                  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.getText()); 
         
        return convertView; 
    } 
     
    //通过ViewHolder显示项的内容  
    static class ViewHolder {  
        public TextView tvSendTime; 
        public TextView tvUserName; 
        public TextView tvContent; 
        public boolean isComMsg = true; 
    } 
     
} 

package com.example.school;

import android.R.integer;
import android.content.Context;
import android.database.DataSetObserver;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup;

import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class ChatMsgViewAdapter extends BaseAdapter {
 
 //ListView视图的内容由IMsgViewType决定
 public static interface IMsgViewType
 {
  //对方发来的信息
  int IMVT_COM_MSG = 0;
  //自己发出的信息
  int IMVT_TO_MSG = 1;
 }
 
    private static final String TAG = ChatMsgViewAdapter.class.getSimpleName();
    private List<ChatMsgEntity> data;
    private Context context; 
    private LayoutInflater mInflater;

    public ChatMsgViewAdapter(Context context, List<ChatMsgEntity> data) {
        this.context = context;
        this.data = data;
        mInflater = LayoutInflater.from(context);
    }

    //获取ListView的项个数
    public int getCount() {
        return data.size();
    }

    //获取项
    public Object getItem(int position) {
        return data.get(position);
    }

    //获取项的ID
    public long getItemId(int position) {
        return position;
    }

    //获取项的类型
 public int getItemViewType(int position) {
  // TODO Auto-generated method stub
   ChatMsgEntity entity = data.get(position);
   
   if (entity.getMsgType())
   {
    return IMsgViewType.IMVT_COM_MSG;
   }else{
    return IMsgViewType.IMVT_TO_MSG;
   }
   
 }

 //获取项的类型数
 public int getViewTypeCount() {
  // TODO Auto-generated method stub
  return 2;
 }
 
 //获取View
    public View getView(int position, View convertView, ViewGroup parent) {
     
     ChatMsgEntity entity = data.get(position);
     boolean isComMsg = entity.getMsgType();
      
     ViewHolder viewHolder = null; 
     if (convertView == null)
     {
        if (isComMsg)
     {
         //如果是对方发来的消息，则显示的是左气泡
      convertView = mInflater.inflate(R.layout.chatting_item_msg_text_left, null);
     }else{
      //如果是自己发出的消息，则显示的是右气泡
      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.getText());
    
     return convertView;
    }
   
    //通过ViewHolder显示项的内容
    static class ViewHolder {
        public TextView tvSendTime;
        public TextView tvUserName;
        public TextView tvContent;
        public boolean isComMsg = true;
    }
   
}

  对方发来消息的显示布局chatting_item_msg_text_left.xml

[html]
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:orientation="vertical" 
        android:padding="6dp"> 
        <LinearLayout 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:orientation="vertical"  
            android:gravity="center_horizontal"> 
            <TextView 
                android:id="@+id/tv_sendtime" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                style="@style/chat_text_date_style"/> 
        </LinearLayout> 
        <RelativeLayout 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:layout_marginTop="5dp" > 
                <ImageView  
                   android:id="@+id/iv_userhead"  
                   android:layout_width="wrap_content" 
                   android:layout_height="wrap_content" 
                   android:focusable="false"  
                   android:layout_alignParentLeft="true"  
                   android:layout_alignParentTop="true"  
                   android:background="@drawable/mini_avatar_shadow"/> 
                <TextView  
                android:id="@+id/tv_chatcontent"  
                android:layout_toRightOf="@id/iv_userhead" 
                android:layout_marginLeft="10dp" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                android:background="@drawable/chatfrom_bg"  
                style="@style/chat_content_date_style"/>    
                <TextView  
                android:id="@+id/tv_username"  
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                android:layout_below="@id/iv_userhead" 
                android:layout_alignParentLeft="true" 
                android:layout_toLeftOf="@id/tv_chatcontent" 
                style="@style/chat_text_name_style"/> 
        </RelativeLayout> 
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:orientation="vertical"
     android:padding="6dp">
     <LinearLayout
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
         android:gravity="center_horizontal">
         <TextView
             android:id="@+id/tv_sendtime"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             style="@style/chat_text_date_style"/>
     </LinearLayout>
     <RelativeLayout
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_marginTop="5dp" >
           <ImageView
             android:id="@+id/iv_userhead"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:focusable="false"
             android:layout_alignParentLeft="true"
                   android:layout_alignParentTop="true"
             android:background="@drawable/mini_avatar_shadow"/>
     <TextView
             android:id="@+id/tv_chatcontent"
             android:layout_toRightOf="@id/iv_userhead"
             android:layout_marginLeft="10dp"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:background="@drawable/chatfrom_bg"
            style="@style/chat_content_date_style"/>  
             <TextView
             android:id="@+id/tv_username"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_below="@id/iv_userhead"
             android:layout_alignParentLeft="true"
             android:layout_toLeftOf="@id/tv_chatcontent"
             style="@style/chat_text_name_style"/>
     </RelativeLayout>
</LinearLayout>

  chatting_item_msg_text_right.xml和上面差不多，只是气泡和头像的方向在右边，就不贴代码了。

 

  主界面的布局chat.xml

[html]
<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="#f0f0e0" > 
    <RelativeLayout 
        android:id="@+id/rl_layout"  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:background="@drawable/title" > 
        <Button  
            android:id="@+id/btn_back"  
            android:gravity="center_vertical"  
            android:layout_marginLeft="5dp"  
            android:paddingLeft="18dp"  
            android:textSize="18.0sp"  
            android:textColor="#ffffff"   
            android:background="@drawable/selector_btn_back"  
            android:layout_width="70dp"  
            android:layout_height="wrap_content"  
            android:text="@string/back" /> 
        <TextView 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="@string/school_title_name" 
            android:layout_centerInParent="true" 
            style="@style/my_txt"/> 
        <ImageView  
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:background="@drawable/campus_info" 
            android:layout_centerVertical="true" 
            android:layout_alignParentRight="true" 
            android:layout_marginRight="15dp"/> 
        </RelativeLayout> 
    <RelativeLayout 
        android:id="@+id/rl_bottom" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:layout_alignParentBottom="true" 
        android:background="@drawable/layout_bg1" > 
        <Button 
            android:id="@+id/btn_send" 
            android:layout_width="60dp" 
            android:layout_height="40dp" 
            android:layout_alignParentRight="true" 
            android:layout_marginRight="10dp" 
            android:layout_centerVertical="true" 
            android:text="@string/send" /> 
        <EditText 
            android:id="@+id/et_sendmessage" 
            android:layout_width="fill_parent" 
            android:layout_height="40dp" 
            android:layout_toLeftOf="@id/btn_send" 
            android:layout_marginLeft="10dp" 
            android:layout_marginRight="10dp" 
            android:background="@drawable/edittext1" 
            android:layout_centerVertical="true" 
            android:singleLine="true" 
            android:textSize="18sp"/> 
    </RelativeLayout> 
    <ListView 
        android:id="@+id/listview" 
        android:layout_below="@id/rl_layout" 
        android:layout_above="@id/rl_bottom" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:layout_marginLeft="10.0dip"  
        android:layout_marginTop="10.0dip"  
        android:layout_marginRight="10.0dip" 
        android:divider="@null" 
        android:dividerHeight="5dp" 
        android:scrollbars="none" 
        android:cacheColorHint="#00000000"/> 
</RelativeLayout> 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#f0f0e0" >
    <RelativeLayout
     android:id="@+id/rl_layout"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:background="@drawable/title" >
     <Button
            android:id="@+id/btn_back"
            android:gravity="center_vertical"
            android:layout_marginLeft="5dp"
            android:paddingLeft="18dp"
            android:textSize="18.0sp"
            android:textColor="#ffffff" 
            android:background="@drawable/selector_btn_back"
            android:layout_width="70dp"
            android:layout_height="wrap_content"
            android:text="@string/back" />
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/school_title_name"
         android:layout_centerInParent="true"
         style="@style/my_txt"/>
     <ImageView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@drawable/campus_info"
         android:layout_centerVertical="true"
         android:layout_alignParentRight="true"
         android:layout_marginRight="15dp"/>
     </RelativeLayout>
    <RelativeLayout
        android:id="@+id/rl_bottom"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@drawable/layout_bg1" >
        <Button
         android:id="@+id/btn_send"
         android:layout_width="60dp"
         android:layout_height="40dp"
         android:layout_alignParentRight="true"
         android:layout_marginRight="10dp"
         android:layout_centerVertical="true"
         android:text="@string/send" />
        <EditText
         android:id="@+id/et_sendmessage"
         android:layout_width="fill_parent"
         android:layout_height="40dp"
         android:layout_toLeftOf="@id/btn_send"
         android:layout_marginLeft="10dp"
         android:layout_marginRight="10dp"
         android:background="@drawable/edittext1"
         android:layout_centerVertical="true"
         android:singleLine="true"
         android:textSize="18sp"/>
    </RelativeLayout>
    <ListView
     android:id="@+id/listview"
     android:layout_below="@id/rl_layout"
     android:layout_above="@id/rl_bottom"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:layout_marginLeft="10.0dip"
  android:layout_marginTop="10.0dip"
  android:layout_marginRight="10.0dip"
     android:divider="@null"
     android:dividerHeight="5dp"
     android:scrollbars="none"
     android:cacheColorHint="#00000000"/>
</RelativeLayout>

  ChatActivity.java

[java]
package com.example.chat; 
 
import java.util.ArrayList; 
import java.util.Calendar; 
import java.util.List; 
 
import com.example.school.R; 
 
import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.view.KeyEvent; 
import android.view.Menu; 
import android.view.View; 
import android.view.Window; 
import android.view.View.OnClickListener; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ListView; 
import android.widget.TextView; 
 
public class ChatActivity extends Activity implements OnClickListener { 
    private Button mBtnSend; 
    private Button mBtnBack; 
    private EditText mEditTextContent; 
    //聊天内容的适配器  
    private ChatMsgViewAdapter mAdapter; 
    private ListView mListView; 
    //聊天的内容  
    private List<ChatMsgEntity> mDataArrays = new ArrayList<ChatMsgEntity>(); 
     
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏  
        setContentView(R.layout.chat); 
        initView(); 
        initData(); 
    } 
     
    //初始化视图  
    private void initView() { 
        mListView = (ListView) findViewById(R.id.listview); 
        mBtnBack = (Button) findViewById(R.id.btn_back); 
        mBtnBack.setOnClickListener(this); 
        mBtnSend = (Button) findViewById(R.id.btn_send); 
        mBtnSend.setOnClickListener(this); 
        mEditTextContent = (EditText) findViewById(R.id.et_sendmessage); 
    } 
 
    private String[] msgArray = new String[]{"  孩子们，要好好学习，天天向上！要好好听课，不要翘课！不要挂科，多拿奖学金！三等奖学金的争取拿二等，二等的争取拿一等，一等的争取拿励志！",  
            "姚妈妈还有什么吩咐...",  
            "还有，明天早上记得跑操啊，不来的就扣德育分！",  
            "德育分是什么？扣了会怎么样？",  
            "德育分会影响奖学金评比，严重的话，会影响毕业",  
            "哇！学院那么不人道？", 
            "你要是你不听话，我当场让你不能毕业！",  
            "姚妈妈，我知错了(- -我错在哪了...)"}; 
 
    private String[]dataArray = new String[]{"2012-09-01 18:00", "2012-09-01 18:10",  
            "2012-09-01 18:11", "2012-09-01 18:20",  
            "2012-09-01 18:30", "2012-09-01 18:35",  
            "2012-09-01 18:40", "2012-09-01 18:50"}; 
    private final static int COUNT = 8; 
     
    //初始化要显示的数据  
    private void initData() { 
        for(int i = 0; i < COUNT; i++) { 
            ChatMsgEntity entity = new ChatMsgEntity(); 
            entity.setDate(dataArray[i]); 
            if (i % 2 == 0) 
            { 
                entity.setName("姚妈妈"); 
                entity.setMsgType(true); 
            }else{ 
                entity.setName("Shamoo"); 
                entity.setMsgType(false); 
            } 
             
            entity.setText(msgArray[i]); 
            mDataArrays.add(entity); 
        } 
        mAdapter = new ChatMsgViewAdapter(this, mDataArrays); 
        mListView.setAdapter(mAdapter); 
    } 
     
    public void onClick(View view) { 
        // TODO Auto-generated method stub  
        switch(view.getId()) { 
        case R.id.btn_back: 
            back(); 
            break; 
        case R.id.btn_send: 
            send(); 
            break; 
        } 
    } 
 
    private void send() 
    { 
        String contString = mEditTextContent.getText().toString(); 
        if (contString.length() > 0) 
        { 
            ChatMsgEntity entity = new ChatMsgEntity(); 
            entity.setDate(getDate()); 
            entity.setName(""); 
            entity.setMsgType(false); 
            entity.setText(contString); 
            mDataArrays.add(entity); 
            mAdapter.notifyDataSetChanged(); 
            mEditTextContent.setText(""); 
            mListView.setSelection(mListView.getCount() - 1); 
        } 
    } 
     
    //获取日期  
    private String getDate() { 
        Calendar c = Calendar.getInstance(); 
        String year = String.valueOf(c.get(Calendar.YEAR)); 
        String month = String.valueOf(c.get(Calendar.MONTH)); 
        String day = String.valueOf(c.get(Calendar.DAY_OF_MONTH) + 1); 
        String hour = String.valueOf(c.get(Calendar.HOUR_OF_DAY)); 
        String mins = String.valueOf(c.get(Calendar.MINUTE)); 
        StringBuffer sbBuffer = new StringBuffer(); 
        sbBuffer.append(year + "-" + month + "-" + day + " " + hour + ":" + mins);  
        return sbBuffer.toString(); 
    } 
    public boolean onKeyDown(int keyCode, KeyEvent event) { 
        back(); 
        return true; 
    } 
     
    private void back() { 
        finish(); 
    } 
} 

package com.example.chat;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

import com.example.school.R;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

public class ChatActivity extends Activity implements OnClickListener {
 private Button mBtnSend;
 private Button mBtnBack;
 private EditText mEditTextContent;
 //聊天内容的适配器
 private ChatMsgViewAdapter mAdapter;
 private ListView mListView;
 //聊天的内容
 private List<ChatMsgEntity> mDataArrays = new ArrayList<ChatMsgEntity>();
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏
  setContentView(R.layout.chat);
  initView();
  initData();
 }
 
 //初始化视图
 private void initView() {
  mListView = (ListView) findViewById(R.id.listview);
  mBtnBack = (Button) findViewById(R.id.btn_back);
  mBtnBack.setOnClickListener(this);
  mBtnSend = (Button) findViewById(R.id.btn_send);
  mBtnSend.setOnClickListener(this);
  mEditTextContent = (EditText) findViewById(R.id.et_sendmessage);
 }

 private String[] msgArray = new String[]{"  孩子们，要好好学习，天天向上！要好好听课，不要翘课！不要挂科，多拿奖学金！三等奖学金的争取拿二等，二等的争取拿一等，一等的争取拿励志！",
   "姚妈妈还有什么吩咐...",
   "还有，明天早上记得跑操啊，不来的就扣德育分！",
   "德育分是什么？扣了会怎么样？",
   "德育分会影响奖学金评比，严重的话，会影响毕业",
   "哇！学院那么不人道？",
   "你要是你不听话，我当场让你不能毕业！",
   "姚妈妈，我知错了(- -我错在哪了...)"};

 private String[]dataArray = new String[]{"2012-09-01 18:00", "2012-09-01 18:10",
   "2012-09-01 18:11", "2012-09-01 18:20",
   "2012-09-01 18:30", "2012-09-01 18:35",
   "2012-09-01 18:40", "2012-09-01 18:50"};
 private final static int COUNT = 8;
 
 //初始化要显示的数据
 private void initData() {
  for(int i = 0; i < COUNT; i++) {
   ChatMsgEntity entity = new ChatMsgEntity();
      entity.setDate(dataArray[i]);
      if (i % 2 == 0)
      {
       entity.setName("姚妈妈");
       entity.setMsgType(true);
      }else{
       entity.setName("Shamoo");
       entity.setMsgType(false);
      }
      
      entity.setText(msgArray[i]);
      mDataArrays.add(entity);
  }
  mAdapter = new ChatMsgViewAdapter(this, mDataArrays);
  mListView.setAdapter(mAdapter);
 }
 
 public void onClick(View view) {
  // TODO Auto-generated method stub
  switch(view.getId()) {
  case R.id.btn_back:
   back();
   break;
  case R.id.btn_send:
   send();
   break;
  }
 }

 private void send()
 {
  String contString = mEditTextContent.getText().toString();
  if (contString.length() > 0)
  {
   ChatMsgEntity entity = new ChatMsgEntity();
   entity.setDate(getDate());
   entity.setName("");
   entity.setMsgType(false);
   entity.setText(contString);
   mDataArrays.add(entity);
   mAdapter.notifyDataSetChanged();
   mEditTextContent.setText("");
   mListView.setSelection(mListView.getCount() - 1);
  }
 }
 
 //获取日期
 private String getDate() {
        Calendar c = Calendar.getInstance();
        String year = String.valueOf(c.get(Calendar.YEAR));
        String month = String.valueOf(c.get(Calendar.MONTH));
        String day = String.valueOf(c.get(Calendar.DAY_OF_MONTH) + 1);
        String hour = String.valueOf(c.get(Calendar.HOUR_OF_DAY));
        String mins = String.valueOf(c.get(Calendar.MINUTE));
        StringBuffer sbBuffer = new StringBuffer();
        sbBuffer.append(year + "-" + month + "-" + day + " " + hour + ":" + mins);
        return sbBuffer.toString();
    }
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  back();
  return true;
 }
 
 private void back() {
  finish();
 }
}

  代码比较多，不过Demo的实现还是比较简单的，有需要的可以留邮箱。