主页 / coding / 问题 / 76980697
Accepted
David Frick
Asked: 2023-08-26 05:43:48 +0800 CST

“activity”在 Runnable 中如何工作？我的 Android 表格未显示

  • 772

我正在使用 JSoup 来解析网站（我必须将其设置为使用明文请求，因为不支持 https）。它是为了Runnable避免阻塞主网络线程。但是，当我运行代码时它似乎没有显示。我怀疑这与（因为我在设置它时遇到问题）有关activity，并且我正在使用内部类，但没有返回错误或警告。我究竟做错了什么？

package com.example.investmenthuntermobile


import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TableRow
import android.widget.TextView
import androidx.fragment.app.Fragment
import com.example.investmenthuntermobile.databinding.InsiderFragmentBinding
import org.jsoup.Jsoup


class InsiderFragment : Fragment() {

    private lateinit var binding: InsiderFragmentBinding


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

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        setupData()
        //val jsonData = finraGetBondInfo("Boeing")

    }

    private fun setupData() {
        val thread = Thread(Task()).start()
    }


    inner class Task() : Runnable {

        override fun run() {
            val doc = Jsoup.connect("http://openinsider.com/search?q=GME").get()
            val table = doc.select(".tinytable")
            // Get the table header cells
            val tableHeaderRow = TableRow(activity)
            tableHeaderRow.isClickable = true
            table.select("thead").select("tr").forEach {row ->
                row.getElementsByTag("th").forEach { cell ->
                Log.d("CELL text", cell.text())
                val textView = TextView(activity)
                textView.text = cell.text()
                tableHeaderRow.addView(textView)

                }
            }
            // Get the table body cells
            table.select("tbody").select("tr").forEach {row ->
                val tableRow = TableRow(requireActivity())
                tableRow.isClickable = true

                row.getElementsByTag("td").forEach { cell ->
                    val textView = TextView(activity)
                    textView.text = cell.text()
                    tableRow.addView(textView)
                }
            }
        }

    }

}
android

3 个回答

  1. 您的 run() 方法当前通过创建 TextView 元素并将它们添加到表行来更新 UI。UI 更新应始终在主线程上执行。您可以使用 runOnUiThread() 方法在主线程上执行更新 UI 的代码。

    这不是我实现它的方式，但如果你想要快速修复，你应该使用下面的代码：

    inner class Task() : Runnable {
    override fun run() {
        activity?.runOnUiThread {
            // Update UI elements here
        }
    }
}
    • 0

  2. 按照 @snachmsm 所说，我更新了代码以使用异步代码而不是可运行代码。我将获取数据和绘制 UI 分开，这样更有意义。

    
class InsiderFragment : Fragment() {

    private lateinit var binding: InsiderFragmentBinding
    private val data = ArrayList<ArrayList<String>>()


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

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        setupData()
        //val jsonData = finraGetBondInfo("Boeing")

    }

    private fun setupData() {
        val test = GlobalScope.async { openinsiderGetData() }
        runBlocking {
            test.await()

            for (row in data) {
                val tableRow = TableRow(activity)
                tableRow.isClickable = true
                for (cell in row) {
                    val textView = TextView(activity)
                    textView.text = cell
                    tableRow.addView(textView)
                }
                binding.table.addView(tableRow)
            }
        }
    }


    private fun openinsiderGetData() {
        val doc = Jsoup.connect("http://openinsider.com/search?q=GME").get()
        val table = doc.select(".tinytable")

        table.select("thead").select("tr").forEach {row ->
            val arrayData = ArrayList<String>()
            row.getElementsByTag("th").forEach { cell ->
                arrayData.add(cell.text())
            }
            data.add(arrayData)
        }
        // Get the table body cells
        table.select("tbody").select("tr").forEach {row ->
            val arrayData = ArrayList<String>()
            row.getElementsByTag("td").forEach { cell ->
                arrayData.add(cell.text())
            }
            data.add(arrayData)
        }
        Log.d("DATA:", data.toString())
    }
    
}
    • 0
  3. Best Answer

    openinsiderGetData()这是您如何使用协程在后台线程上正确完成工作的方法。

    private fun setupData() {
    lifecycleScope.launch {
        withContext(Dispatchers.Default) {
            openinsiderGetData()
        }

        for (row in data) {
            val tableRow = TableRow(activity)
            tableRow.isClickable = true
            for (cell in row) {
                val textView = TextView(activity)
                textView.text = cell
                tableRow.addView(textView)
            }
            binding.table.addView(tableRow)
        }
    }
}
    • 0

相关问题