Interact with API in Activity

LoginActivity

class LoginActivity : AppCompatActivity() {

    ...
    
    fun authenticate() {
        val loginJob = Job()

        val errorHandler = CoroutineExceptionHandler { _, exception ->
            AlertDialog.Builder(this).setTitle("Error")
                .setMessage(exception.message)
                .setPositiveButton(android.R.string.ok) { _, _ -> }
                .setIcon(android.R.drawable.ic_dialog_alert).show()
        }

        val coroutineScope = CoroutineScope(loginJob + Dispatchers.Main)

        var session: CanarySession? = null
        coroutineScope.launch(errorHandler) {
            session = MockyAPIImplementation().authenticate()

            //DON'T ACTUALLY log people's authentication tokens in a production application
            Log.i("Session Retrieved:", session.toString())

            if (session?.token != null) {
                startActivity(Intent(this@LoginActivity, MainActivity::class.java))
            } else {
                deliverAuthFailureMessage()
            }

        }
    }

    private fun deliverAuthFailureMessage() {
        AlertDialog.Builder(this).setTitle("Whoops")
            .setMessage("Wrong credentials. Try again?")
            .setPositiveButton(android.R.string.ok) { _, _ -> }
            .setIcon(android.R.drawable.ic_dialog_alert).show()

    }

}