Android 用于更改文本的数据绑定onClick函数

当我使用数据绑定单击按钮时，我试图更改按钮文本

这是按钮XML

 <Button
        android:id="@+id/TimeBtn"
        android:layout_width="246dp"
        android:layout_height="100dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="44dp"
        android:layout_marginEnd="8dp"
        android:onClick="@{() ->  activityTrackerViewModel.startStopTracking()}"
        android:text="@string/startWork"
       .... />

但是我想不出怎样才能修改文本

这是ActivityFragment：

    class ActivityTrackerFragment : Fragment() {
 

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                     savedInstanceState: Bundle?): View? {

        val binding: FragmentActivityTrackerBinding = DataBindingUtil.inflate(
                inflater, R.layout.fragment_activity_tracker, container, false)

        val application = requireNotNull(this.activity).application
       
        val dataSource = ActivityDatabase.getInstance(application).activityDatabaseDao
        val viewModelFactory = ActivityTrackerViewModelFactory(dataSource, application)
     


        val activityTrackerViewModel =
                ViewModelProvider(
                        this, viewModelFactory).get(ActivityTrackerViewModel::class.java)

     
        binding.activityTrackerViewModel = activityTrackerViewModel


        //here I'm trying to use ClickListner
        binding.TimeBtn.setOnClickListener {
        binding.TimeBtn.setText(R.string.stopWork)
    }
        binding.lifecycleOwner = this

        return binding.root
    }
}

    class ActivityTrackerFragment : Fragment() {
 

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                     savedInstanceState: Bundle?): View? {

        val binding: FragmentActivityTrackerBinding = DataBindingUtil.inflate(
                inflater, R.layout.fragment_activity_tracker, container, false)

        val application = requireNotNull(this.activity).application
       
        val dataSource = ActivityDatabase.getInstance(application).activityDatabaseDao
        val viewModelFactory = ActivityTrackerViewModelFactory(dataSource, application)
     


        val activityTrackerViewModel =
                ViewModelProvider(
                        this, viewModelFactory).get(ActivityTrackerViewModel::class.java)

     
        binding.activityTrackerViewModel = activityTrackerViewModel


        //here I'm trying to use ClickListner
        binding.TimeBtn.setOnClickListener {
        binding.TimeBtn.setText(R.string.stopWork)
    }
        binding.lifecycleOwner = this

        return binding.root
    }
}