在大多数情况下，视图绑定取代了 findViewById。
Java
在 Gradle 文件中添加这个
android {
...
buildFeatures {
viewBinding true
}
}
科特林
android {
...
buildFeatures {
viewBinding = true
}
}
如果您希望在生成绑定类时忽略布局文件，请将 tools:viewBindingIgnore="true" 属性添加到该布局文件的根视图：
<LinearLayout
...
tools:viewBindingIgnore="true" >
...
在活动中使用视图绑定
科特林
private lateinit var binding: ResultProfileBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ResultProfileBinding.inflate(layoutInflater)
val view = binding.root
setContentView(view)
}
Java
private ResultProfileBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ResultProfileBinding.inflate(getLayoutInflater());
View view = binding.getRoot();
setContentView(view);
}
您现在可以使用绑定类的实例来引用任何视图：
科特林
binding.name.text = viewModel.name
binding.button.setOnClickListener { viewModel.userClicked() }
Java
binding.getName().setText(viewModel.getName());
binding.button.setOnClickListener(new View.OnClickListener() {
viewModel.userClicked()
});
在片段中查看绑定
科特林
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;
}
您现在可以使用绑定类的实例来引用任何视图：
科特林
binding.name.text = viewModel.name
binding.button.setOnClickListener { viewModel.userClicked() }
Java
binding.getName().setText(viewModel.getName());
binding.button.setOnClickListener(new View.OnClickListener() {
viewModel.userClicked()
});