Tabs+ViewPager+Fragment Icons

Question

I have like 3 tabs, each tab has an icon.
I want to change the icon when the user change the tab.
Tried to put conditions in getPageTitle but its not working.
Maybe getPageTitle run only once. Here's my code.

public class searchView extends ActionBarActivity {
    private Toolbar toolbar;
    private ViewPager mPager;
    private SlidingTabLayout mTabs;
    public static final int HISTORY = 0;
    public static final int FAVORITES = 1;
    public static final int CATEGORY = 2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_search_view);
        toolbar = (Toolbar) findViewById(R.id.app_bar);
        setSupportActionBar(toolbar);

        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        mPager = (ViewPager) findViewById(R.id.pager);
        mPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
        mPager.setCurrentItem(Global.setCurrentItem);
        mPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                if (position == 0) {
                    getSupportActionBar().setTitle("History");
                } else if (position == 1) {
                    getSupportActionBar().setTitle("Favorites");
                } else {
                    getSupportActionBar().setTitle("Category");
                }
            }

            @Override
            public void onPageSelected(int position) {
            }

            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });


        mTabs = (SlidingTabLayout) findViewById(R.id.tabs);
        mTabs.setCustomTabView(R.layout.custom_tab_view, R.id.tabText);
        mTabs.setDistributeEvenly(true);

        mTabs.setBackgroundColor(getResources().getColor(R.color.primaryColor));
        mTabs.setSelectedIndicatorColors(getResources().getColor(R.color.white));
        mTabs.setViewPager(mPager);

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_search, menu);
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                NavUtils.navigateUpFromSameTask(this);
                return true;
            case R.id.actSearch:
                GlobalVar.getActivity = 3;
                startActivity(new Intent(this, searchingView.class));
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }


    class MyPagerAdapter extends FragmentPagerAdapter {
        int icons[] = {R.drawable.ic_history, R.drawable.ic_favorite_white, R.drawable.ic_category};
        public MyPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            Fragment myFragment = null;
            switch (position) {
                case HISTORY:
                    myFragment = FragmentHistory.newInstance("", "");
                    break;
                case FAVORITES:
                    myFragment = FragmentFavorites.newInstance("", "");
                    break;
                case CATEGORY:
                    myFragment = FragmentCategory.newInstance("", "");
                    break;
            }
            return myFragment;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            Drawable drawable = getResources().getDrawable(icons[position]);
            drawable.setBounds(0, 0, 72, 72);
            ImageSpan imageSpan = new ImageSpan(drawable);
            SpannableString spannableString = new SpannableString(" ");
            spannableString.setSpan(imageSpan, 0, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            return spannableString;
        }

        @Override
        public int getCount() {
            return 3;
        }
    }
}