非常有用的关于数据绑定的博客: https://link.medium.com/HQY2VizKO1

class FragmentBinding<out T : ViewDataBinding>(
    @LayoutRes private val resId: Int
) : ReadOnlyProperty<Fragment, T> {

    private var binding: T? = null

    override operator fun getValue(
        thisRef: Fragment,
        property: KProperty<*>
    ): T = binding ?: createBinding(thisRef).also { binding = it }

    private fun createBinding(
        activity: Fragment
    ): T = DataBindingUtil.inflate(LayoutInflater.from(activity.context),resId,null,true)
}

在Fragment中像这样声明binding val:

private val binding by FragmentBinding<FragmentLoginBinding>(R.layout.fragment_login)

别忘了把这段话分段写下来

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    return binding.root
}

我一直在为我的应用程序寻找答案，这里是Kotlin语言的答案。

private lateinit var binding: FragmentForgetPasswordBinding

override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?): View? {
    binding=DataBindingUtil.inflate(inflater,R.layout.fragment_forget_password,container,false)
    
    val viewModel=ViewModelProvider(this).get(ForgetPasswordViewModel::class.java)
    binding.recoveryViewModel=viewModel
    viewModel.forgetPasswordInterface=this
    return binding.root
}

你实际上被鼓励使用你生成的Binding的膨胀方法，而不是DataBindingUtil:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    MainFragmentBinding binding = MainFragmentBinding.inflate(inflater, container, false);
    //set variables in Binding
    return binding.getRoot();
}

(MainFragmentBinding为r.b ayout.main_fragment自动生成)

databindingutil . inflation()文档:

仅在layoutId预先未知的情况下使用此版本。否则，使用生成的Binding的膨胀方法来确保类型安全的膨胀。

科特林

         override fun onCreateView(
                 inflater: LayoutInflater, container: ViewGroup?,
                 savedInstanceState: Bundle?
            ): View? 
    { 
                 val binding = FragmentFirstBinding.inflate(inflater,container,false)      
               return  binding.root;
            

}

其中FragmentFirstBinding是由android studio使用视图绑定自动生成的。在我的代码片段名称是FirstFragment。

首先，您需要将这一行添加到构建中。Gradle(app模块)文件。

buildFeatures{
        viewBinding true
    }

一个完整的数据绑定片段的例子

FragmentMyProgramsBinding是为res/layout/fragment_my_programs生成的绑定类

public class MyPrograms extends Fragment {
    FragmentMyProgramsBinding fragmentMyProgramsBinding;

    public MyPrograms() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
    FragmentMyProgramsBinding    fragmentMyProgramsBinding = DataBindingUtil.inflate(inflater, R
                .layout.fragment_my_programs, container, false);
        return fragmentMyProgramsBinding.getRoot();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

    }
}

正如大多数人所说，但是不要忘记设置LifeCycleOwner Java示例 即

public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    BindingClass binding = DataBindingUtil.inflate(inflater, R.layout.fragment_layout, container, false);
    ModelClass model = ViewModelProviders.of(getActivity()).get(ViewModelClass.class);
    binding.setLifecycleOwner(getActivity());
    binding.setViewmodelclass(model);

    //Your codes here

    return binding.getRoot();
}