kotlin: 项目中启用viewBinding

一，启用

 编辑build.gradle.kts

android {
    namespace = "com.example.okdemo2"
    compileSdk = 35

    buildFeatures {
        buildConfig = true
        viewBinding = true
    }

二，代码中使用

 

package com.example.okdemo2.fragment

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.example.okdemo2.R
import com.example.okdemo2.databinding.FragmentUserListBinding

// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"

/**
 * A simple [Fragment] subclass.
 * Use the [UserListFragment.newInstance] factory method to
 * create an instance of this fragment.
 */
class UserListFragment : Fragment() {
    // TODO: Rename and change types of parameters
    private var param1: String? = null
    private var param2: String? = null

    private var _binding: FragmentUserListBinding? = null

    // This property is only valid between onCreateView and
    // onDestroyView.
    private val binding get() = _binding!!


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        arguments?.let {
            param1 = it.getString(ARG_PARAM1)
            param2 = it.getString(ARG_PARAM2)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        //_binding = FragmentUserListBinding.inflate(inflater, container, false)
        _binding = FragmentUserListBinding.inflate(inflater, container, false)
        return binding.root
        // Inflate the layout for this fragment
        //return inflater.inflate(R.layout.fragment_user_list, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        
        //按钮点击
        binding.getJsonButton.setOnClickListener {
           // findNavController().navigate(R.id.action_FirstFragment_to_SecondFragment)
            println("按钮被点击了")
        }

    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }

    companion object {
        /**
         * Use this factory method to create a new instance of
         * this fragment using the provided parameters.
         *
         * @param param1 Parameter 1.
         * @param param2 Parameter 2.
         * @return A new instance of fragment UserListFragment.
         */
        // TODO: Rename and change types and number of parameters
        @JvmStatic
        fun newInstance(param1: String, param2: String) =
            UserListFragment().apply {
                arguments = Bundle().apply {
                    putString(ARG_PARAM1, param1)
                    putString(ARG_PARAM2, param2)
                }
            }
    }
}

三，测试效果