异步加载数据的三种实现

[java]
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 MethodTestAsynTextViewActivity 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);
        }
    };

}
[java]
package com.testasyntextview;

/**
* 使用AsyncTask类
*/
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.Spanned;
import android.util.Log;
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;

        progressDialog = new ProgressDialog(context);
        progressDialog.setTitle("进度条");
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

        textView1 = (TextView) findViewById(R.id.textView1);
        button1 = (Button) findViewById(R.id.button1);

补充：软件开发 , Java ,