public override fun onStart()

in build-android/app/src/main/java/com/google/firebase/codelab/friendlychat/MainActivity.kt [126:135]


    public override fun onStart() {
        super.onStart()
        // Check if user is signed in.
        if (auth.currentUser == null) {
            // Not signed in, launch the Sign In activity
            startActivity(Intent(this, SignInActivity::class.java))
            finish()
            return
        }
    }