package com.example.firstapp.ui.home
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import android.widget.TextView
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import androidx.fragment.app.Fragment
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import androidx.lifecycle.ViewModelProvider
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import androidx.recyclerview.widget.LinearLayoutManager
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import androidx.recyclerview.widget.RecyclerView
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import com.example.firstapp.R
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import com.example.firstapp.adapter.MyAdapter
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import com.example.firstapp.core.Core
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import com.example.firstapp.databinding.FragmentHomeBinding
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class HomeFragment : Fragment() {
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private var _binding: FragmentHomeBinding? = null
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// This property is only valid between onCreateView and
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// onDestroyView.
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private val binding get() = _binding!!
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private lateinit var homeViewModel: HomeViewModel
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private lateinit var adapter: MyAdapter
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override fun onCreateView(
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inflater: LayoutInflater,
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container: ViewGroup?,
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savedInstanceState: Bundle?
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): View {
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homeViewModel =
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ViewModelProvider(this).get(HomeViewModel::class.java)
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_binding = FragmentHomeBinding.inflate(inflater, container, false)
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val root: View = binding.root
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// val textView: TextView = binding.textHome
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// homeViewModel.text.observe(viewLifecycleOwner) {
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// textView.text = it
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// }
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// 初始化适配器
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adapter = MyAdapter()
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// 获取数据
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// val codeList = Core.code.getAllDesc()
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// 使用 binding 来访问 RecyclerView
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val recyclerView: RecyclerView = binding.recyclerView
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recyclerView.layoutManager = LinearLayoutManager(requireContext()) // 使用 requireContext() 获取上下文
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recyclerView.adapter = adapter
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// 观察 LiveData，当数据发生变化时，更新 RecyclerView 的内容
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homeViewModel.codeList.observe(viewLifecycleOwner) { codeList ->
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adapter.submitList(codeList) // 更新 RecyclerView 的数据
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// 滚动到顶部
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recyclerView.scrollToPosition(0)
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}
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return root
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}
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override fun onDestroyView() {
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super.onDestroyView()
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_binding = null
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}
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}
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