Update ProgressBar inside AsyncTask

Update ProgressBar inside AsyncTask

<?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:id="@+id/progressbar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:max="100"
android:progress="0"
/>
<Button
android:id="@+id/start"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="- Start -"
/>
</LinearLayout>


package com.AndroidProgressBar;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class AndroidProgressBar extends Activity {

Button buttonStart;
ProgressBar progressBar;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonStart = (Button)findViewById(R.id.start);
progressBar = (ProgressBar)findViewById(R.id.progressbar);

buttonStart.setOnClickListener(new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
buttonStart.setClickable(false);
new asyncTaskUpdateProgress().execute();
}

});

}

public class asyncTaskUpdateProgress extends AsyncTask<Void, Integer, Void> {

int progress;

@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
buttonStart.setClickable(true);
}

@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
progress = 0;
}

@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
progressBar.setProgress(values[0]);
}

@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
while(progress<100){
progress++;
publishProgress(progress);
SystemClock.sleep(100);
}
return null;
}

}
}


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