简化Id检索

从Android Jetpack的Data Binding库中，我们可以使用Binding类来简化这个过程

/*build.gradle*/
android {
    ...
    dataBinding {
        enabled = true
    }
}

<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

    </data>

    <!-- Your layout code here -->

</layout>

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        // 现在可以直接使用binding来访问视图
        binding.textView.text = "Hello, Data Binding!"
    }
}