实现的效果如图：

RecentActivity：

public class RecentActivity extends Activity{

	ListView listView;

	List chatEntityList=new ArrayList();

	String[] mes;

	

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		requestWindowFeature(Window.FEATURE_NO_TITLE);

		setContentView(R.layout.activity_recent);

		 //注册广播

		IntentFilter myIntentFilter = new IntentFilter(); 

        myIntentFilter.addAction("org.yhn.yq.mes");

        registerReceiver(new MyBroadcastReceiver(), myIntentFilter);

        

	    listView = (ListView) findViewById(R.id.lv_recent);

        listView.setOnItemClickListener(new OnItemClickListener(){

			public void onItemClick(AdapterView arg0, View arg1, int position,

					long arg3) {

				//打开聊天页面

				Intent intent=new Intent(RecentActivity.this,ChatActivity.class);

				intent.putExtra("account", Integer.parseInt(mes[0]));

				intent.putExtra("nick", "");

				startActivity(intent);

			}

        });

	}

	//广播接收器

	public class MyBroadcastReceiver extends BroadcastReceiver {

		@Override

		public void onReceive(Context context, Intent intent) {

			mes = intent.getStringArrayExtra("message");

		    Toast.makeText(context, "收到["+Integer.parseInt(mes[0])+"]的消息："+mes[1], Toast.LENGTH_SHORT).show();

		    //更新最近会话列表， 检测chatEntityList，防止同一个好友的消息出现多个会话实体

		    Iterator it=chatEntityList.iterator();

		    if(chatEntityList!=null && chatEntityList.size()!=0){

		    	while(it.hasNext()){

		    		RecentEntity re=(RecentEntity) it.next();

		    		if(re.getAccount()==Integer.parseInt(mes[0])){

		    			chatEntityList.remove(re);

		    		}

		    	}

		    }

		    chatEntityList.add(new RecentEntity(5, Integer.parseInt(mes[0]), mes[0]+"", mes[1],mes[2], false));

		    listView.setAdapter(new RecentAdapter(RecentActivity.this, chatEntityList));

		    unregisterReceiver(this);

		}

	}

}

public class RecentAdapter extends BaseAdapter{

	private Context context;

	private List list;

	LayoutInflater inflater;

	

	public RecentAdapter(Context context,List list){

		this.context = context;

		this.list = list;

		inflater = LayoutInflater.from(context);

	}

	public View getView(int position, View convertView, ViewGroup root) {

		convertView = inflater.inflate(R.layout.recent_listview_item, null);

		

		ImageView avatar=(ImageView) convertView.findViewById(R.id.iv_avatar_r);

		TextView nick=(TextView) convertView.findViewById(R.id.tv_nick_r);

		TextView content=(TextView) convertView.findViewById(R.id.tv_chat_content_r);

		ImageView isRead=(ImageView) convertView.findViewById(R.id.iv_tip_mes_r);

		TextView time=(TextView) convertView.findViewById(R.id.tv_time_r);

		RecentEntity re=list.get(position);

		nick.setText(re.getNick());

		content.setText(re.getContent());

		isRead.setImageResource(R.drawable.tips_message);

		time.setText(re.getTime());

		return convertView;

	}

	public int getCount() {

		return list.size();

	}

	public Object getItem(int position) {

		return list.get(position);

	}

	public long getItemId(int position) {

		return position;

	}

}

消息实体类，就不贴代码了，很简单，你懂的

--------------------------------------------------分割线----------------------------------------------------------

完善了部分界面，以及一些细节，

后台运行，

增加了用户头像（简易方式，暂不能自定义头像），

用户个人信息

。。。

具体就不说了看图吧：