Android之高仿微信聊天的界面

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：http://download.csdn.net/detail/weidi1989/4588782

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;
	}

}

OK，大功告成，大家耐心点看看吧，文字比较少。