Android tabs changing between activities

I have an application with 3 tabs. I have made the xml files to describe the layout and it works perfectly. But I'm stuck at this point. My tabs are A B C. I want when I click on tab A, the tabs B C to be replaced by another tab D. Are there any solutions for this?

<!-- language: java -->
public class AndroidTabLayoutActivity extends TabActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        TabHost tabHost = getTabHost();
        TabHost tabHost2 = getTabHost();

        // Tab for Photos
        TabSpec photospec = tabHost.newTabSpec("Photos");
        photospec.setIndicator("Photos", getResources().getDrawable(R.drawable.icon_photos_tab));
        Intent photosIntent = new Intent(this, LoginActivity.class);
        photospec.setContent(photosIntent);

        // Tab for Songs
        TabSpec songspec = tabHost.newTabSpec("Songs");
        // setting Title and Icon for the Tab
        songspec.setIndicator("Songs", getResources().getDrawable(R.drawable.icon_songs_tab));
        Intent songsIntent = new Intent(this, SettingsActivity.class);
        songspec.setContent(songsIntent);

        // Tab for Videos
        TabSpec videospec = tabHost.newTabSpec("Videos");
        videospec.setIndicator("Videos", getResources().getDrawable(R.drawable.icon_videos_tab));
        Intent videosIntent = new Intent(this, AboutActivity.class);
        videospec.setContent(videosIntent);

        // Adding all TabSpec to TabHost
        tabHost.addTab(photospec); // Adding photos tab
        tabHost.addTab(songspec); // Adding songs tab
        tabHost.addTab(videospec); // Adding videos tab
    }
}

<!-- language: xml -->
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"开发者_C百科 />
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
    </LinearLayout>
</TabHost>