pager.java

private void setupTabs() {
        mTabHost = (MaterialTabHost) findViewById(R.id.materialTabHost);
        mPager = (ViewPager) findViewById(R.id.viewPager);
        mAdapter = new ViewPagerAdapter(getSupportFragmentManager());
        mPager.setAdapter(mAdapter);
        //when the page changes in the ViewPager, update the Tabs accordingly
        mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                mTabHost.setSelectedNavigationItem(position);

            }
        });
        //Add all the Tabs to the TabHost
        for (int i = 0; i < mAdapter.getCount(); i++) {
            mTabHost.addTab(
                    mTabHost.newTab()
                            .setText(mAdapter.getPageTitle(i))
                            .setTabListener(this));
        }

    }