TimePickerDialogue Fragment Kotlin需要哪个片段管理器

我正在尝试实现一个简单的TimePickerDialogue片段,它在布局中按下按钮时显示,布局也是一个片段。Android开发者指南在Java中显示了这一点:

public void showTimePickerDialog(View v) {
    DialogFragment newFragment = new TimePickerFragment();
    newFragment.show(getSupportFragmentManager(), "timePicker");
}

并说:

show()方法需要fragmentmanager的实例和片段的唯一名称。

当我把这个转换成Kotlin的时候 getSupportFragmentManager 提供的方法。我应该用什么代替?

class AlertsFragment : Fragment() {    

    fun showTimePickerDialog(v: View) {
        val newFragment = TimePickerFragment()
        newFragment.show(FragmentManager(), "timePicker") // WHAT FRAGMENTMGR???
    }
}

我正在导入 android.support.v4.app.Fragment

我的main活动将显示timepickerdialogue片段以及具有打开timepickerdialogue按钮的片段。mainActivity有一个使用片段的tablayout。 是否需要在mainActivity中进行任何更改才能使timePickerDialogue show()函数在AlertsFragment中工作?

class MainActivity : FragmentActivity(){

    private lateinit var pagerAdapter: TabPagerAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        pagerAdapter = TabPagerAdapter(supportFragmentManager)
        pagerAdapter.addFragments(WorkoutGridFragment(), "Workouts")
        pagerAdapter.addFragments(AlertsFragment(), "Reminders")
        pagerAdapter.addFragments(AboutFragment(), "About")

        // customViewPager is the viewpager created in the activity_main xml layout
        customViewPager.adapter = pagerAdapter

        // set up the viewpager with the tablayout
        customTabLayout.setupWithViewPager(customViewPager)
    }
}