Fragment实现侧边菜单抽屉及Activity折线图代码迁移适配求助

import android.content.Intent
import android.net.Uri
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.activity.result.contract.ActivityResultContracts
import androidx.core.view.GravityCompat
import androidx.fragment.app.Fragment
import com.github.mikephil.charting.data.Entry
import com.github.mikephil.charting.data.LineData
import com.github.mikephil.charting.data.LineDataSet
import com.github.mikephil.charting.utils.Easing
import java.io.BufferedReader
import java.io.IOException
import java.io.InputStreamReader
import java.util.Collections

// 替换为你自己项目的FragmentChartBinding包路径
import com.yourpackage.databinding.FragmentChartBinding

class ChartFragment : Fragment() {
    private var _binding: FragmentChartBinding? = null
    private val binding get() = _binding!!

    // Activity Result必须注册为类成员，不可写在onCreateView内
    private val getContent = registerForActivityResult(ActivityResultContracts.GetContent()) { uri: Uri? ->
        val lines = readCSV(uri)
        val newEntries = lines.map { line -> toEntry(line) }
            .groupingBy { entry -> entry.x }
            .reduce { _, accumulator, element ->
                if (accumulator.y > element.y) accumulator else element
            }.values
        val vl = LineDataSet(newEntries.toList().take(4000), "cost")
        vl.setDrawValues(false)
        vl.setDrawFilled(true)
        vl.lineWidth = 1.5f
        vl.fillColor = R.color.gray
        vl.fillAlpha = R.color.red
        vl.setDrawCircles(false)
        binding.lineChart.data = LineData(vl)
        binding.lineChart.notifyDataSetChanged()
        binding.lineChart.animateX(1800, Easing.EaseInExpo)
        binding.lineChart.description.isEnabled = false
        binding.lineChart.isHighlightPerDragEnabled = false
        binding.lineChart.isScaleYEnabled = false
        binding.lineChart.axisRight.isEnabled = false
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?,
    ): View {
        _binding = FragmentChartBinding.inflate(inflater, container, false)

        // CSV加载按钮点击逻辑
        binding.btnLoadCsv.setOnClickListener {
            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
            intent.addCategory(Intent.CATEGORY_OPENABLE)
            intent.type = "text/*"
            getContent.launch("text/*")
        }

        // 折线图标记初始化
        val markerView = CustomMarker(requireContext(), R.layout.marker_view)
        binding.lineChart.marker = markerView

        // 如需在Fragment内打开侧边抽屉，添加如下逻辑（宿主Activity需已实现DrawerLayout）
        // binding.btnOpenDrawer.setOnClickListener {
        //     (requireActivity() as MainActivity).drawerLayout.openDrawer(GravityCompat.START)
        // }

        return binding.root
    }

    override fun onDestroyView() {
        super.onDestroyView()
        // 调整Binding回收时机到View销毁时，避免内存泄漏
        _binding = null
    }

    @Throws(IOException::class)
    fun readCSV(uri: Uri?): List<String> {
        if (uri != null) {
            val csvFile = requireContext().contentResolver.openInputStream(uri)
            val isr = InputStreamReader(csvFile)
            return BufferedReader(isr).readLines()
        }
        return Collections.emptyList()
    }

    private fun toEntry(line: String): Entry {
        val split = line.split(";")
        val time = split[1]
        val secondsStartIdx = time.length - 2
        val minutesStartIdx = time.length - 4
        val hoursStartIdx = (time.length - 6).coerceAtLeast(0)

        val hour = time.substring(hoursStartIdx, hoursStartIdx + time.length - 4)
        val minutest = time.substring(minutesStartIdx, minutesStartIdx + 2)
        val seconds = time.substring(secondsStartIdx, secondsStartIdx + 2)

        val newTime =
            hour.toFloat() * 10000 + (minutest.toFloat() * 100 / 60).toInt() * 100 + (seconds.toFloat() * 100 / 60).toInt()
        return Entry(newTime, split[2].toFloat())
    }
}

• 你提供的XML布局文件无需任何改动，控件ID与代码完全匹配
• 调整了Activity Result的注册位置，符合Fragment的API规范，避免运行时崩溃
• 所有Context相关调用替换为requireContext()获取的合法宿主上下文
• 调整ViewBinding的回收时机为onDestroyView，符合Fragment生命周期规范，避免内存泄漏
• 保留原Activity全部业务逻辑，功能与原有实现完全一致
• 侧边抽屉默认由宿主Activity的DrawerLayout实现，代码中已给出Fragment内调用打开抽屉的示例，取消注释并补充对应按钮即可使用

内容的提问来源于stack exchange，提问作者MaksChojniak1