Android switching screens

Tutorial from http://learnandroid.blogspot.com/2008/01/opening-new-screen-in-android.html

With minor changes so it works for me, I use Android 2.3.3

TestScreenActivity.java

package test.android;

import android.app.Activity;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
public class TestScreenActivity extends Activity 
{
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button b = (Button)findViewById(R.id.btnClick);
        
        b.setOnClickListener(new View.OnClickListener() 
        {
   
   @Override
   public void onClick(View v) 
   {
    Intent i = new Intent(TestScreenActivity.this, Screen2.class);
    startActivity(i);
   }
  });
    }
}

main.xml

<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <Button
        android:id="@+id/btnClick"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

Screen2.java

package test.android;

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

public class Screen2 extends Activity
{
   public void onCreate(Bundle icicle)
   {
      super.onCreate(icicle);
      setContentView(R.layout.screen2);
      Button b = (Button) findViewById(R.id.btnClick2);
      b.setOnClickListener(new View.OnClickListener() 
      {
         public void onClick(View arg0) {
         setResult(RESULT_OK);
         finish();
         } 
      });
   }
}

screen2.xml (Note that Screen2.xml is not accepted...)

<?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="You are in the New Screen"
/>
<Button 
   android:id="@+id/btnClick2"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Close"
/>

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="test.android"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" >
        <activity android:name=".TestScreenActivity" android:label="@string/app_name">            
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
   <activity android:name=".Screen2"  android:label="@string/app_name">
    <intent-filter>
          <category android:name="android.intent.category.DEFAULT"/>
      </intent-filter>
       </activity>
    </application>
</manifest>