Android异步处理

import java.net.MalformedURLException;import java.net.URL;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ProgressBar;import android.widget.TextView;public class AsyncTaskActivity extends Activity {private ProgressBar progress;private TextView tv;/** Called when the activity is first created. */class MyAsyncTask extends AsyncTask<URL, Integer, String> {@Overrideprotected void onPreExecute() {progress = (ProgressBar) findViewById(R.id.pb1);tv = (TextView) findViewById(R.id.tv1);}@Overrideprotected void onProgressUpdate(Integer... values) {progress.setProgress(values[0]);}protected String doInBackground(URL... params) {for (int i = 0; i < 100; i++) {try {Thread.sleep(300);} catch (InterruptedException e) {e.printStackTrace();}publishProgress(i + 1);}return "success";}@Overrideprotected void onPostExecute(String result) {tv.setText(result);}}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Button btn = (Button) findViewById(R.id.btn14_1);btn.setOnClickListener(new OnClickListener() {public void onClick(View v) {// TODO Auto-generated method stubMyAsyncTask asyncTask = new MyAsyncTask();try {asyncTask.execute(new URL("http://www.baidu.com"));} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}});}}