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;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 =http://www.mamicode.com/ 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;    }    }

<?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"?><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>

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();    }}