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   源码介绍

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public class ChatActivity extends Activity implements OnClickListener {
	/** Called when the activity is first created. */

	private Button mBtnSend;
	private Button mBtnBack;
	private EditText mEditTextContent;
	private XListView mListView;
	private ChatMsgViewAdapter mAdapter;
	private Handler mHandler;
	private List<ChatMsgEntity> mDataArrays = new ArrayList<ChatMsgEntity>();
	private int start = 0;
	private static int refreshCnt = -1;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		initView();
	}

	public void initView() {
		mListView = (XListView) findViewById(R.id.listview);

		// 如果不想让脚标显示数据可以mListView.setPullLoadEnable(false)
		mListView.setPullLoadEnable(true);
		mListView.setPullRefreshEnable(true);
		// mListView.setIsAnimation(true);
		mListView.setDivider(null);
		mListView.setCacheColorHint(Color.TRANSPARENT);
		geneItems();
		// mAdapter.notifyDataSetChanged();

		mAdapter = new ChatMsgViewAdapter(ChatActivity.this, mDataArrays);
		mListView.setAdapter(mAdapter);
		//

		mListView.setXListViewListener(new IXListViewListener() {

			@Override
			public void onRefresh() {
				Log.i("liang", "刷新");
				mHandler.postDelayed(new Runnable() {
					@Override
					public void run() {
						start =   refreshCnt;
						mDataArrays.clear();
						geneItems();
						// mAdapter.notifyDataSetChanged();
						Log.i("liang", "刷新");
						mAdapter = new ChatMsgViewAdapter(ChatActivity.this, mDataArrays);
						mListView.setAdapter(mAdapter);
						onLoad();
					}
				}, 2000);
			}

			@Override
			public void onLoadMore() {
				mHandler.postDelayed(new Runnable() {
					@Override
					public void run() {
						
						geneItems();

						mAdapter.notifyDataSetChanged();
						onLoad();
					}
				}, 2000);
			}
		});

		mListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
				// TODO Auto-generated method stub
				System.out.println(arg0   "------"   arg2);
			}
		});
		mHandler = new Handler();
		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 void geneItems() {
		Log.i("liang", "初始化");
		
		for (int i = 0; i < 6; i  ) {
			start  ;
			ChatMsgEntity entity = new ChatMsgEntity();
			entity.setDate("2012-5-12 12:28:"   start);
			if (i % 2 == 0) {
				entity.setName("乌子");
				entity.setMsgType(true);
			} else {
				entity.setName("我");
				entity.setMsgType(false);
			}
			entity.setText("内容"   start);
			mDataArrays.add(entity);
		}

	}

	private void onLoad() {
		mListView.stopRefresh();
		mListView.stopLoadMore();
		mListView.setRefreshTime("刚刚");
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch (v.getId()) {
		case R.id.btn_send:
			send();
			break;
		case R.id.btn_back:
			finish();
			break;
		}
	}

	private void send() {
		String contString = mEditTextContent.getText().toString();
		if (contString.length() > 0) {
			ChatMsgEntity entity = new ChatMsgEntity();
			entity.setDate(getDate());
			entity.setName("我");
			entity.setMsgType(false);
			entity.setText(contString);
			mDataArrays.add(entity);
			mAdapter.notifyDataSetChanged();
			mEditTextContent.setText("");
			mListView.setSelection(mListView.getCount() - 1);
		}
	}

	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();
	}
}