BaseActivity for the demo of template creation.

BaseActivity.kt

abstract class BaseActivity<D : ViewDataBinding, V : BaseViewModel> : AppCompatActivity(){

    @get:LayoutRes
    protected abstract val layoutId: Int

    protected abstract val viewModelClass: Class<V>

    internal val viewModel:V by lazy { ViewModelProvider(this).get(viewModelClass) }

    internal lateinit var binding: D
        private set


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        viewModel.onActivityCreated(intent.extras)

        binding = DataBindingUtil.setContentView(this, layoutId)
        binding.setVariable(BR.viewModel, viewModel)
        binding.lifecycleOwner = this

        onCreated(savedInstanceState,intent.extras)
    }

    open fun onCreated(savedInstanceState: Bundle?, extras: Bundle?) { }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        viewModel.onActivityResult(requestCode, resultCode, data)
    }
}