Android-Handler更新View加线程

package net.blogjava.mobile;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ProgressBar;

public class Main extends Activity
{
private ProgressBar progressBar1;
private ProgressBar progressBar2;
private Handler handler = new Handler();
private int count1 = 0;
private int count2 = 0;
private Runnable doUpdateProgressBar1 = new Runnable()
{

@Override
public void run()
{

for (count1 = 0; count1 <= progressBar1.getMax(); count1++)
{
handler.post(new Runnable()
{

@Override
public void run()
{
progressBar1.setProgress(count1);

}
});
}

}
};
private Runnable doUpdateProgressBar2 = new Runnable()
{

@Override
public void run()
{
for (count2 = 0; count2 <= progressBar2.getMax(); count2++)
{
handler.post(new Runnable()
{

@Override
public void run()
{
progressBar2.setProgress(count2);

}
});
}

}
};

@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
progressBar1 = (ProgressBar) findViewById(R.id.progressbar1);
progressBar2 = (ProgressBar) findViewById(R.id.progressbar2);

Thread thread1 = new Thread(doUpdateProgressBar1, "thread1");
thread1.start();
Thread thread2 = new Thread(doUpdateProgressBar2, "thread2");
thread2.start();

}
}

<?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">
<ProgressBar android:id="@+id/progressbar1"
android:layout_width="fill_parent" android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal" android:max="20000"
android:layout_marginTop="10dp" />
<ProgressBar android:id="@+id/progressbar2"
android:layout_width="fill_parent" android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal" android:max="10000"
android:layout_marginTop="10dp"  />
</LinearLayout>