public class MainActivity extends Activity

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button PrefrencesButtonb=(Button) findViewById(R.id.PrefrencesButton);

    PrefrencesButtonb.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            Intent ip = new Intent(getApplicationContext(),PrefrencesPage.class);
            startActivity(ip);
        }
    });

public class PrefrencesPage extends MainActivity
 {

protected void onCreate(Bundle savedInstanceState)
     {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.prefrences);

    Button PrefrencesBackButtonb=(Button) findViewById(R.id.PrefrencesBackButton);

    PrefrencesBackButtonb.setOnClickListener(new View.OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
        finish();

        }
    });

 }

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@drawable/sky_backgorund_day"
tools:context="com.example.bio_balloon_initial_main_menu_no_andengine.MainActivity" >
            <Button
            android:id="@+id/PrefrencesButton"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/HiScoreButton"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/QuoteButton"
            android:layout_marginTop="20dp"
            android:text="Preferences"
            android:textColor="#ffffff" />
</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/night_sky_backgorund"
android:orientation="vertical" >
        <Button
        android:id="@+id/PrefrencesBackButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="30dp"
        android:background="@drawable/main_menu_style"
        android:text="Back"
        android:textColor="#ffffff" />
</RelativeLayout>