如何在项目中封装 Kotlin + Android Databinding

class TestViewHolder(view: View) : BaseViewHolder<Model>(view) {
    val binding: RecycieItemTestBinding by viewHolderBinding(view)
    override fun bindData(data: Model) {
        binding.apply {
            model = data
            executePendingBindings()
        }
    }
}

class TestAdapter : DataBindingListAdapter<Model>(Model.CALLBACK) {
    override fun viewHolder(layout: Int, view: View): DataBindingViewHolder<Model> = when (layout) {
        R.layout.recycie_item_header -> HeaderViewHolder(view)
        else -> TestViewHolder(view)
    }
    override fun layout(position: Int): Int = when (position) {
        0 -> R.layout.recycie_item_header
        getItemCount() - 1 -> R.layout.recycie_item_footer
        else -> R.layout.recycie_item_test
    }
    override fun getItemCount(): Int = super.getItemCount() + 2
}

val CALLBACK: DiffUtil.ItemCallback<Model> = object : DiffUtil.ItemCallback<Model>() {
            // 判断两个Objects 是否代表同一个item对象， 一般使用Bean的id比较
            override fun areItemsTheSame(oldItem: Model, newItem: Model): Boolean =
                oldItem.id == newItem.id
            // 判断两个Objects 是否有相同的内容。
            override fun areContentsTheSame(oldItem: Model, newItem: Model): Boolean = true
        }

<data>
    <variable
        name="viewModel"
        type="com.hi.dhl.jdatabinding.demo.ui.MainViewModel" />
    <variable
        name="testAdapter"
        type="com.hi.dhl.jdatabinding.demo.ui.TestAdapter" />
</data>   
<androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:adapter="@{testAdapter}"
        app:adapterList="@{viewModel.mLiveData}"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />

class AppDialog(
    context: Context,
    val title: String? = null,
    val message: String? = null,
    val yes: AppDialog.() -> Unit
) : DataBindingDialog(context, R.style.AppDialog) {
    private val mBinding: DialogAppBinding by binding(R.layout.dialog_app)
    init {
        requireNotNull(message) { "message must be not null" }
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        requestWindowFeature(Window.FEATURE_NO_TITLE)
        mBinding.apply {
            setContentView(root)
            display.text = message
            btnNo.setOnClickListener { dismiss() }
            btnYes.setOnClickListener { yes() }
        }
    }
}

AppDialog(
        context = this@MainActivity,
        message = msg,
        yes = {
            // do something
        }).show()

class MainActivity : DataBindingActivity() {
    private val mBinding: ActivityMainBinding by binding(R.layout.activity_main)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mBinding.apply {
            dialog.setOnClickListener {
                val msg = getString(R.string.dialog_msg)
                AppDialog(
                        context = this@MainActivity,
                        message = msg,
                        yes = {
                            Toast.makeText(this@MainActivity, msg, Toast.LENGTH_SHORT).show()
                        }).show()
            }
        }
    }
}

class FragmentTest : DataBindingFragment() {
    val testViewModel: MainViewModel by viewModel()
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return binding<FragmentTestBinding>(
            inflater,
            R.layout.fragment_test, container
        ).apply {
            viewModel = testViewModel
            testAdapter = TestAdapter()
            lifecycleOwner = this@FragmentTest
        }.root
    }
}