Android的Thread & ProgressBar

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/progressbar_default"
/>
<ProgressBar
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:id="@+id/progressbar_Horizontal"
android:max="100"
/>

</LinearLayout>

//-----------------------soruce code--------------------------------

package android.demo.thread0;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.widget.ProgressBar;public class Thread0_Activity extends Activity {ProgressBar bar0;ProgressBar bar1;boolean isRunning=false;Handler handler=new Handler() {        public void handleMessage(Message msg)//會從Message Queue取出Message         {            bar0.incrementProgressBy(5);            bar1.incrementProgressBy(5);        }    };    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        bar0 = (ProgressBar)findViewById(R.id.progressbar_Horizontal);        bar1 = (ProgressBar)findViewById(R.id.progressbar_default);    }    @Override    public void onStart()     {        super.onStart();        bar0.setProgress(0);        bar1.setProgress(0);        //Thread background=new Thread(run0);       // background.start();                ProgressThread ProgressThread0=new ProgressThread();        ProgressThread0.start();    }        privateRunnable run0=new Runnable(){    @Override    public void run()    {    // TODO Auto-generated method stub    try     {    for (int i=0;i<20 /*&& isRunning*/;i++)     {    Thread.sleep(1000);    handler.sendMessage(handler.obtainMessage());    }    }    catch (Throwable t)     {                    // just end the background thread    }    }};public class ProgressThread extends Thread{public void run(){    try     {    for (int i=0;i<20 /*&& isRunning*/;i++)     {    sleep(1000);    handler.sendMessage(handler.obtainMessage());    }    }    catch (Throwable t)     {                    // just end the background thread    }}};}

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