Showing and Hiding the ProgressBar

LoginActivity.kt

package com.chelseatroy.canary

class LoginActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
      ...
      signInButton.setOnClickListener { view ->
            if (isNetworkConnected()) {
                //HERE'S WHERE WE SHOW THE PROGRESS BAR
                progressBar.visibility = View.VISIBLE
                authenticate()
            } else {
                ...
            }
        }
    }

    fun authenticate() {
        ...
            session = MockyAPIImplementation().authenticate()
      
            //HERE'S WHERE WE HIDE THE PROGRESS BAR
            progressBar.visibility = View.GONE

            ...
        }
    }

}