ActionBar Tabs наложение вкладок

package com.contedevel.timetable;
 
import android.app.ActionBar.Tab;
import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
 
public class TabListener<T extends Fragment> implements ActionBar.TabListener {
    private Fragment mFragment;
    private final Activity mActivity;
    private final String mTag;
    private final Class<T> mClass;
 
    /** Constructor used each time a new tab is created.
      * @param activity  The host Activity, used to instantiate the fragment
      * @param tag  The identifier tag for the fragment
      * @param clz  The fragment's Class, used to instantiate the fragment
      */
    public TabListener(Activity activity, String tag, Class<T> clz) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
    }
 
    /* The following are each of the ActionBar.TabListener callbacks */
 
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // Check if the fragment is already initialized
        if (mFragment == null) {
            // If not, instantiate and add it to the activity
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            // If it exists, simply attach it in order to show it
            ft.attach(mFragment);
        }
    }
 
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            // Detach the fragment, because another one is being attached
            ft.detach(mFragment);
        }
    }
 
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        // User selected the already selected tab. Usually do nothing.
    }
}

package com.contedevel.timetable;
 
import com.contedevel.timetable.helpers.SettingsHelper;
import com.contedevel.timetable.settings.SettingActivity;
 
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RelativeLayout;
 
public class MainActivity extends Activity{
    //Initialization of variables
    private ActionBar actionBar;
    private Tab tab1;
    private Tab tab2;
    private Tab tab3;
    private SettingsHelper sh;
    
    private Context context;
    //Layout id
    int layout_id;
    
    //On create
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Initialization of helpers
        sh = new SettingsHelper(this);
        //Set theme
        if(sh.getTheme().equalsIgnoreCase("dark")) {
            setTheme(R.style.Theme_Darkbasetheme);
            layout_id = R.layout.d_activity_main;
        }
        else {
            setTheme(R.style.Theme_Lightbasetheme);
            layout_id = R.layout.activity_main;
        }
        setContentView(layout_id);
        //Get ActionBar
        actionBar = getActionBar();
        //Prepare ActionBar
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        actionBar.setDisplayShowTitleEnabled(true);
        //Get context
        this.context = this;
        //Create tabs
        updateTabs();
    }
    
    //Tab creator
    private void updateTabs() {
        // TODO Auto-generated method stub
        actionBar.removeAllTabs();
        if (sh.getMode() == 1) {
            tab1 = actionBar.newTab().setText(R.string.title_tab1).setTabListener(new TabListener<Week1Fragment>(this, "week1", Week1Fragment.class));
            actionBar.addTab(tab1);
                
            tab2 = actionBar.newTab().setText(R.string.title_tab2).setTabListener(new TabListener<Week2Fragment>(this, "week2", Week2Fragment.class));
            actionBar.addTab(tab2);
         }
         else {
         tab1 = actionBar.newTab().setText(R.string.title_tab1_2).setTabListener(new TabListener<Week1Fragment>(this, "week1", Week1Fragment.class));
            actionBar.addTab(tab1);
         }
         tab3 = actionBar.newTab().setText(R.string.title_tab3).setTabListener(new TabListener<NowFragment>(this, "now", NowFragment.class));
         actionBar.addTab(tab3);
    }
}