关于异步加载数据的又一种实现

package com.testasyntextview;
/**
 * 把获取的线程写到方法中(比较好)
 */
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.Spanned;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class TestAsynTextViewActivity extends Activity {
	private TextView textView1;
	private Button button1;
	private Context context;
	private ProgressDialog progressDialog;
	private Spanned html;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		context = this;
		textView1 = (TextView) findViewById(R.id.textView1);
		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(l);

	}

	private OnClickListener l = new OnClickListener() {

		@Override
		public void onClick(View v) {

			progressDialog = ProgressDialog.show(context, "获取数据中", "等待");
			getHtmlDate();

		}
	};

	private void getHtmlDate() {// 获取数据,把线程写入了其中
		new Thread() {
			public void run() {
				Message msg = myHandler.obtainMessage();
				try {
					html = HttpUtil.fromHtml(HttpUtil
							.getHtml("http://wap.sina.com"));
					msg.what = 0;
				} catch (Exception e) {
					e.printStackTrace();
					msg.what = 1;
				}

				myHandler.sendMessage(msg);
			}
		}.start();
	}

	Handler myHandler = new Handler() {

		public void handleMessage(Message msg) {
			switch (msg.what) {
			case 0:
				textView1.setText(html);
				progressDialog.dismiss();
				break;
			case 1:
				textView1.setText("当前无数据");
				progressDialog.dismiss();
				break;
			}
			super.handleMessage(msg);
		}
	};

}