import kotlinx.android.synthetic.main.activity_main.fab
import kotlinx.android.synthetic.main.activity_main.toolbar

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        setSupportActionBar(toolbar)

        fab.setOnClickListener {
            Toast.makeText(baseContext, "Clicked Action Button", Toast.LENGTH_SHORT).show()
            showMainFragment()
        }
    }