Kotlin - 1. View Binding

1、View Binding

一、Enabling View Binding

android {

    // module级别的build.gradle文件中添加下名的配置
    // 会自动为xml文件生成binding class
    // 命名规则是Pascal case  + Binding
    // 可在XML中添加属性来屏蔽生成binding class
    // tools:viewBindingIgnore="true"
    buildFeatures {
        viewBinding true
    }
}

 

二、Using View Binding in Activities

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        val view = binding.root
        setContentView(view)
       
        // ...

    }
}


binding.myButton.setOnClickListener { // Button Tapped }
binding.myTextView.text = "View Binding is the best!"

 

三、Using View Binding in Fragments

inflate methos

class DemoInflateFragment : Fragment() {

    private var fragmentDemoBinding: FragmentDemoBinding = null

    // 注意是在onCreateView中inflate内容，所以AsyncLayoutInflater不适应Fragment
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup, savedInstanceState: Bundle): View {
        val binding = FragmentDemoBinding.inflate(inflater, container, false)
        fragmentDemoBinding = binding

        binding.myButton.setOnClickListener {
             // Button Tapped
        }
   
        binding.myTextView.text = "View Binding is the best!"

        return binding.root
    }
    override fun onDestroyView() {
        // View不见时Fragment可以存在
        fragmentDemoBinding = null
        super.onDestroyView()
    }  
}