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   源码介绍

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mainactivity:

package com.test;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity implements OnClickListener {

	android.os.Handler handler = new android.os.Handler() {
		public void handleMessage(Message message) {
			// System.out.println("handler");
			// System.out.println(message.what);
			// System.out.println(message.arg1);
			// System.out.println(message.arg2);
			// System.out.println(message.obj);
			// System.out.println(message.getData().get("name"));
			text1.setText("hello");
		}
	};

	class MyTask extends AsyncTask {

		protected Object doInBackground(Object... objs) {
			System.out.println("doInBackground");
			System.out.println(objs[0]);
			for (int i = 0; i < 10; i  ) {
				try {
					Thread.sleep(1000);
				} catch (Exception ex) {
					ex.printStackTrace();
				}
				this.publishProgress(i);
			}
			return "ok";
		}

		protected void onProgressUpdate(Object... objs) {
			System.out.println("onProgressUpdate");
			text1.setText(objs[0].toString());
		}

		protected void onPostExecute(Object result) {
			System.out.println("onPostExecute");
			text1.setText(result.toString());
		}
	}

	android.widget.Button button1;
	android.widget.Button button2;
	android.widget.Button button3;
	android.widget.TextView text1;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		button1 = (android.widget.Button) this.findViewById(R.id.button1);
		button1.setOnClickListener(this);
		button2 = (android.widget.Button) this.findViewById(R.id.button2);
		button2.setOnClickListener(this);
		button3 = (android.widget.Button) this.findViewById(R.id.button3);
		button3.setOnClickListener(this);
		text1 = (android.widget.TextView) this.findViewById(R.id.text1);
	}

	public void onClick(View arg0) {
		switch (arg0.getId()) {
		case R.id.button1:
			// System.out.println("button1");
			new Thread() {
				public void run() {
					try {
						// Thread.sleep(2000);
						Message message = handler.obtainMessage();
						System.out.println(message.hashCode());
						message.what = 1;
						message.arg1 = 2;
						message.arg2 = 3;
						message.obj = "anbo";
						android.os.Bundle bundle = new android.os.Bundle();
						bundle.putString("name", "handson");
						message.setData(bundle);
						handler.sendMessage(message);
						// handler.sendEmptyMessageDelayed(2, 5000);
						// handler.removeMessages(2);
					} catch (Exception ex) {
						ex.printStackTrace();
					}
					// System.out.println("button1 after");
				}
			}.start();
			break;
		case R.id.button2:
			System.out.println("button2");
			break;
		case R.id.button3:
			/*
			 * Thread tt = new Thread() { public void run() {
			 * System.out.println("asdfasdf"); text1.setText("xxxxx"); try {
			 * Thread.sleep(9000); } catch (Exception ex) {
			 * ex.printStackTrace(); } } }; handler.post(tt); //
			 * MainActivity.this.runOnUiThread(tt); // text1.post(tt);
			 */

			MyTask task = new MyTask();
			task.execute("aa");
			System.out.println("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
			break;
		}

	}
}