private fun initTabs() {
        tabLayout.addTab(tabLayout.newTab().setText(getString(R.string.tab_title_uploaded_photos)))
        tabLayout.addTab(tabLayout.newTab().setText(getString(R.string.tab_title_received_photos)))
        tabLayout.addTab(tabLayout.newTab().setText(getString(R.string.tab_title_gallery)))
        tabLayout.tabGravity = TabLayout.GRAVITY_FILL

        viewPager.adapter = adapter
        viewPager.offscreenPageLimit = 1

        viewPager.clearOnPageChangeListeners()
        viewPager.addOnPageChangeListener(this)

        tabLayout.clearOnTabSelectedListeners()
        tabLayout.addOnTabSelectedListener(this)
    }

    override fun onTabReselected(tab: TabLayout.Tab) {
        viewPager.currentItem = tab.position
    }

    override fun onTabUnselected(tab: TabLayout.Tab) {
    }

    override fun onTabSelected(tab: TabLayout.Tab) {
        viewPager.currentItem = tab.position
    }

    override fun onPageScrollStateChanged(state: Int) {
    }

    override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
        tabLayout.setScrollPosition(position, positionOffset, true)
    }

    override fun onPageSelected(position: Int) {
        viewPager.currentItem = position
    }