private val TAB_TITLES = arrayOf(
        R.string.tab_text_1,
        R.string.tab_text_2,
        R.string.tab_text_3
)
 
/**
 * A [FragmentPagerAdapter] that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
class SectionsPagerAdapter(private val context: Context, fm: FragmentManager)
    : FragmentPagerAdapter(fm) {
 
    override fun getItem(position: Int): Fragment {
        var fragment: Fragment? = null
        when(position){
            0 -> fragment = Frag01()
            1 -> fragment = Frag02()
            2 -> fragment = Frag03()
        }
        return fragment
    }
 
    override fun getPageTitle(position: Int): CharSequence? {
        return context.resources.getString(TAB_TITLES[position])
    }
 
    override fun getCount(): Int {
        // Show 2 total pages.
        return 3
    }
}

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