Android 异步处理工具类（AsyncTask）

    <?xml version="1.0" encoding="utf-8"?>  
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        android:orientation="vertical" >  
      
        <ProgressBar  
            android:id="@+id/bar"  
            android:layout_width="fill_parent"  
            android:layout_height="wrap_content"  
            style="?android:attr/progressBarStyleHorizontal"/>  
      
        <TextView  
            android:id="@+id/info"  
            android:layout_width="fill_parent"  
            android:layout_height="wrap_content"  
            android:text="" />  
      
    </LinearLayout>  

import android.app.Activity;  
import android.app.AlertDialog;  
import android.app.Dialog;  
import android.content.DialogInterface;  
import android.os.AsyncTask;  
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.view.View.OnFocusChangeListener;  
import android.widget.Button;  
import android.widget.EditText;  
import android.widget.ProgressBar;  
import android.widget.TextView;  
  
public class Hello extends Activity {  
    private ProgressBar bar = null;  
    private TextView info = null;  
  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState); // 生命周期方法  
        super.setContentView(R.layout.main); // 设置要使用的布局管理器  
        this.bar = (ProgressBar) super.findViewById(R.id.bar);  
        this.info = (TextView) super.findViewById(R.id.info);  
        ChildUpdate child = new ChildUpdate();//子任务对象  
        child.execute(100);//设置休眠时间  
  
    }  
  
    private class ChildUpdate extends AsyncTask<Integer,Integer,String> {  
//覆写如下方法  
        @Override  
        protected String doInBackground(Integer... params) {//处理后台任务  
            for (int x = 0; x < 100; x++) {  
                Hello.this.bar.setProgress(x);//进度条设置  
                this.publishProgress(x);//传递每次更新内容  
                try {  
                    Thread.sleep(params[0]);  
                } catch (InterruptedException e) {  
                    e.printStackTrace();  
                }  
  
            }  
            return "执行完毕！";  
        }  
  
        @Override  
        protected void onPostExecute(String result) {//任务执行完后执行  
            Hello.this.info.setText(result);  
        }  
  
        @Override  
        protected void onProgressUpdate(Integer... progress) {//每次更新后的数值  
            Hello.this.info.setText("当前进度为：" + String.valueOf(progress[0]));  
        }  
  
    }  
}