HomeActivity.kt

class HomeActivity : AppCompatActivity(), LifecycleOwner{

    private var viewModel = HomeViewModel()

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

        viewModel = ViewModelProviders.of(this).get(HomeViewModel::class.java)
        viewModel.loading.observe(this, Observer { displayLoading(it ?: false) })
        viewModel.message.observe(this, Observer { displayMessage( it ) })
        viewModel.jadwal.observe(this, Observer { displayData(it) })
    }
  
    private fun displayData(jadwal: JadwalSholatApi.Jadwal?) {
        // Display UI
    }

    private fun displayMessage(messages: String?) {
        // Display UI
    }

    private fun displayLoading(loading: Boolean) {
        // Display UI
    }

}