详解Android高仿微信聊天界面实例

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btn   private Button mBtnBack;// 返回btn   private EditText mEditTextContent;   private ListView mListView;   private ChatMsgViewAdapter mAdapter;// 消息视图的Adapter   private 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view   initData();// 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);   }   @Override   public 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;   }   }

消息对象的代码：

package com.way.demo;   /**   * 一个消息的JavaBean   *   * @author way   *   */   public class ChatMsgEntity {   private String name;//消息来自   private String date;//消息日期   private String message;//消息内容   private boolean isComMeg = true;// 是否为收到的消息   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 getMessage() {   return message;   }   public void setMessage(String message) {   this.message = message;   }   public boolean getMsgType() {   return isComMeg;   }   public void setMsgType(boolean isComMsg) {   isComMeg = isComMsg;   }   public ChatMsgEntity() {   }   public ChatMsgEntity(String name, String date, String text, boolean isComMsg) {   super();   this.name = name;   this.date = date;   this.message = text;   this.isComMeg = isComMsg;   }   }

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