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Hello, I have updated my activity class as fragment, but I am not sure how to update the parts in the photo（3个答案）
8小时前关门了。
我正在尝试将我的MainActivity.kt转换成一个Fragment，所以到目前为止，代码的开头看起来是这样的：

class MainActivity : Fragment() {
lateinit var mAdView : AdView    private lateinit var progressDialog: ProgressDialog
private var selectedtype = "Ultra fast"
private val binding by lazy {
    ActivityMainBinding.inflate(layoutInflater)
}


override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.main_activity, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    //setContentView(binding.root)
    progressDialog = ProgressDialog(this)
    progressDialog.setCancelable(false)
    progressDialog.setCanceledOnTouchOutside(false)
    inIt()
    MobileAds.initialize(this) {}
    mAdView = view.findViewById(R.id.adView)
    val adRequest = AdRequest.Builder().build()
    mAdView.loadAd(adRequest)
    
    getSupportActionBar()?.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM)
    getSupportActionBar()?.setCustomView(R.layout.actionbar_title)

}

我有这个错误：
类型不匹配：推断类型为MainActivity，但应为Context!
此处：

progressDialog = ProgressDialog(this)

这里：

MobileAds.initialize(this) {}

和这个错误：
未解析的引用：获取支持操作栏
此处：

getSupportActionBar()?.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM)
getSupportActionBar()?.setCustomView(R.layout.actionbar_title)

我该怎么解决这些问题呢？