XML使用Fragment

    android:id="@+id/rootView"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    />

private fun changeFragment(targetFragment: Fragment) {

supportFragmentManager.beginTransaction()

.replace(R.id.rootView, targetFragment, "fragment")

.setTransitionStyle(FragmentTransaction.TRANSIT_FRAGMENT_FADE).commit()

}