ViewBinding使用详解

ViewBinding使用详解

• 使用ViewBinding时需要先在build.gradle文件中声明

      //老版本
      viewBinding {
          enabled = true
      }
      //新版本
      buildFeatures {
          viewBinding = true
      }
  

• 生成绑定类时忽略某个布局文件，请将 tools:viewBindingIgnore="true" 属性添加到相应布局文件的根视图中：

  <LinearLayout
                ...
                tools:viewBindingIgnore="true" >
      ...
  LinearLayout>
  

• 使用

  假设activity_main.xml为布局文件，所生成的绑定类的名称就为 ActivityMainBinding

      private lateinit var binding: ResultProfileBinding
  
      override fun onCreate(savedInstanceState: Bundle) {
          super.onCreate(savedInstanceState)
          binding = ResultProfileBinding.inflate(layoutInflater)
          val view = binding.root
          setContentView(view)
          
          binding.name.text = viewModel.name
      	binding.button.setOnClickListener {  }
      }
  

• 在Fragment中的视图绑定

  kotlin

      private var _binding: ResultProfileBinding? = null
      // This property is only valid between onCreateView and
      // onDestroyView.
      private val binding get() = _binding!!
  
      override fun onCreateView(
          inflater: LayoutInflater,
          container: ViewGroup?,
          savedInstanceState: Bundle?
      ): View? {
          _binding = ResultProfileBinding.inflate(inflater, container, false)
          val view = binding.root
          return view
      }
  
      override fun onDestroyView() {
          super.onDestroyView()
          _binding = null
      }
      
  

  java

      private ResultProfileBinding binding;
  
      @Override
      public View onCreateView (LayoutInflater inflater,
                                ViewGroup container,
                                Bundle savedInstanceState) {
          binding = ResultProfileBinding.inflate(inflater, container, false);
          View view = binding.getRoot();
          return view;
      }
  
      @Override
      public void onDestroyView() {
          super.onDestroyView();
          binding = null;
      }
      
  

• 视图绑定不支持布局变量或布局表达式，因此不能用于直接在 XML 布局文件中声明动态界面内容。

• 视图绑定不支持双向数据绑定。