Android findViewById（）返回从数据绑定创建的空视图

出于某种原因，当我使用findFragmentById（）引用使用数据绑定创建的SeekBar视图时，它返回空对象。请问我怎样才能得到这个视图的参考

这是我的seekBar：

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </SeekBar>
</layout>

UtilClass在此处实例化：

class MainActivity : AppCompatActivity() {

private lateinit var mUtilClass: UtilClass
....
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    mUtilClass = UtilClass(requireActivity())
    retainInstance = true

    var fm = fragmentManager
    var fragment: Fragment? = fm!!.findFragmentById(R.id.seek_container)

    if (fragment == null) {

        fragment = SeekBarFragment.newInstance()

        fm.beginTransaction()
            .add(R.id.seek_container, fragment)
            .commit()
            }
}

class SeekBarFragment: Fragment() {

companion object {
    fun newInstance(): SeekBarFragment {
        return SeekBarFragment()
    }
}

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

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    val binding: SeekbarBinding = DataBindingUtil.inflate(inflater, R.layout.seekbar, container, false)
...
}

在此处创建绑定：

class MainActivity : AppCompatActivity() {

private lateinit var mUtilClass: UtilClass
....
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    mUtilClass = UtilClass(requireActivity())
    retainInstance = true

    var fm = fragmentManager
    var fragment: Fragment? = fm!!.findFragmentById(R.id.seek_container)

    if (fragment == null) {

        fragment = SeekBarFragment.newInstance()

        fm.beginTransaction()
            .add(R.id.seek_container, fragment)
            .commit()
            }
}

class SeekBarFragment: Fragment() {

companion object {
    fun newInstance(): SeekBarFragment {
        return SeekBarFragment()
    }
}

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

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    val binding: SeekbarBinding = DataBindingUtil.inflate(inflater, R.layout.seekbar, container, false)
...
}

---

您应该指定父布局视图

覆盖创建视图(
充气机，
容器：视图组？，
savedInstanceState:捆绑？
)：查看{
变量v：视图=充气机。充气（R.layout.seekbar，container，false）
var seekbar=v.findViewById（R.id.seekbar）
返回v
}

您的UtilClass在哪里实例化？很抱歉，我将其添加到主要问题中，但我创建了带有数据绑定的视图：val binding:SeekbarBinding=DataBindingUtil.inflate（充气器，R.layout.seekbar，容器，false）