Java – How to change the activity title when the tab changes (slide TabLayout)

I’ve been searching for a solution for this for about three days. I tried a lot but I can’t use it correctly. (Or maybe I’m doing it wrong).
So, what I want to do is change the activity title to the current tab name, and every time I change the tab, the activity title should also change.

So I have a MainActivity with 3 tabs and 3 different tab fragments. Here is MainActivity:

public class MainActivity extends ActionBarActivity {

private Toolbar toolbar;                    
    private ViewPager mPager;                   
    private SlidingTabLayout mTabs;             

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

toolbar = (Toolbar) findViewById(R.id.app_bar);             
        setSupportActionBar(toolbar);

mPager = (ViewPager) findViewById(R.id.pager);              
        mPager.setAdapter(new CustomPagerAdapter(getSupportFragmentManager()));
        mTabs = (SlidingTabLayout) findViewById(R.id.tabs);         
        mTabs.setDistributeEvenly(true);
        mTabs.setViewPager(mPager);
    }

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
         Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
         Handle action bar item clicks here. The action bar will
         automatically handle clicks on the Home/Up button, so long
         as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

return super.onOptionsItemSelected(item);
    }

Custom ViewPager for the tabs
    class CustomPagerAdapter extends FragmentPagerAdapter {
        String[] tabsTitles;
        String vpPager;

public CustomPagerAdapter(FragmentManager fm) {
            super(fm);
            tabsTitles = getResources().getStringArray(R.array.tabTitles);
        }

@Override
        public Fragment getItem(int position) {
            if (position == 0){
                news_fragment news_fragment = new news_fragment();
                return news_fragment;
            //}
            if (position == 1){
                login_fragment login_fragment = new login_fragment();
                return login_fragment;
            }
            else if (position == 2){
                about_fragment about_fragment = new about_fragment();
                return about_fragment;
            }
            else {
                news_fragment news_fragment = new news_fragment();
                return news_fragment;
            }
        }

@Override
        public CharSequence getPageTitle(int position) {
            return tabsTitles[position];
        }

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

}

I’m using this SlidingTabLayout

Try this :

viewpager
                .setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

@Override
                    public void onPageSelected(int position) {
                         TODO Auto-generated method stub

actionBar.setTitle(tabsTitles[position]);
                    }

@Override
                    public void onPageScrolled(int arg0, float arg1, int arg2) {
                         TODO Auto-generated method stub

}

@Override
                    public void onPageScrollStateChanged(int pos) {
                         TODO Auto-generated method stub

}
                });