Android Kotlin将应用程序文件复制到；档案；应用程序通过意图

我有一个Android Kotlin应用程序。我使用的是API27+。我的应用程序中生成了一个.csv文件。我正在尝试将此应用程序创建的.csv文件写入android设备“文件”应用程序

我可以在我的应用程序的缓存目录中创建该文件。缓存文件看起来很棒

当我使用intent编写文件应用程序时，会创建一个“Files”文件，但它是空的

要将应用程序的.csv文件复制到包含数据的“文件”应用程序，我需要更改什么？如果创建文档是错误的意图，那么哪一个是正确的？如果我更改了intent类型，我需要对manifest/gradle进行哪些更改才能共享数据

在我的应用程序中创建虚拟.csv文件的代码：

private fun downloadFile() {
    val CSV_HEADER = "id,name,address,age"

    val myToyBoxFile = File.createTempFile("MyToyBox", ".csv")
    var fileWriter: FileWriter? = null

    try {
        fileWriter = FileWriter(myToyBoxFile)

        fileWriter.append(CSV_HEADER)
        fileWriter.append('\n')


        fileWriter.append("aaaaa")
        fileWriter.append(',')
        fileWriter.append("bbbbb")
        fileWriter.append(',')
        fileWriter.append("cccccc")
        fileWriter.append(',')
        fileWriter.append("dddddd")
        fileWriter.append('\n')
        println("Write CSV successfully!")

    } catch (e: Exception) {
        println("Writing CSV error!")
        e.printStackTrace()
    }

    fileWriter!!.close()

    val uriForFile = Uri.fromFile(myToyBoxFile)
    createFile(uriForFile)
}

意图代码

val CREATE_FILE = 1

private fun createFile(pickerInitialUri: Uri) {
    val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
        putExtra(Intent.EXTRA_STREAM, pickerInitialUri)
        addCategory(Intent.CATEGORY_OPENABLE)
        type = "text/csv"
        putExtra(Intent.EXTRA_TITLE, "myToyBox.csv")
        addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
    }
    startActivityForResult(intent, CREATE_FILE)
}

---

我没有让“文件”应用程序的集成工作，但我确实可以访问“共享”工作，允许我通过电子邮件发送文件

Android页面及其链接以及许多stackoverflow页面是什么

高级别

将提供程序添加到清单中

添加带有文件共享“路径”位置的res->xml->file\u path文档

编写代码以使用“路径”位置共享文件

详细步骤

使用“提供者”详细信息更新清单->应用程序部分

         <category android:name="android.intent.category.LAUNCHER" />
     </intent-filter>
 </activity>
 <provider
     android:name="androidx.core.content.FileProvider"
     android:authorities="com.com.YOURDOMAIN.YOURAPP.fileprovider"
     android:exported="false"
     android:grantUriPermissions="true">
     <meta-data
         android:name="android.support.FILE_PROVIDER_PATHS"
         android:resource="@xml/file_paths" />
 </provider>

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <files-path name="my_docs" path="docs/"/>
</paths>

 val filePath: File = File(requireContext().filesDir, "docs")
 filePath.mkdirs()
 val newFile = File(filePath, "MyToyBox.csv")
 newFile.delete()
 newFile.createNewFile()
 val contentUri = FileProvider.getUriForFile(
     requireContext(),
     "com.YOURDOMAIN.YOURAP.fileprovider",
     newFile
 )

 val CSV_HEADER = "Series,My Toy Box ID,Debut Year,Phase,Wave,Action Figure Package Name," +
         "Movie Scene," +
         "Estimated New Value,Have the New Figure,Have New Count," +
         "Want the New Figure,Want New Count," +
         "Sell the New Figure,Sell New Count," +
         "Order the New Figure,Order New Count," +
         "Order from Text," +
         "Have the Loose Figure,Have Loose Count" +
         ",Want the Loose Figure,Want Loose Count" +
         ",Sell the Loose Figure,Sell Loose Count" +
         ",Notes" + "\n"

 var fileWriter: FileWriter? = null

 try {
     fileWriter = FileWriter(newFile)

     fileWriter.append(CSV_HEADER)

     figureList.forEach { figure ->

         val specifics = figure.specifics

         val noText = "No"
         val yesText = "Yes"

         val new_haveCount = specifics.new_haveCount.toString()
         val new_wantCount = specifics.new_wantCount.toString()
         val new_sellCount = specifics.new_sellCount.toString()
         val new_orderCount = specifics.new_orderCount.toString()
         val new_orderText = specifics.new_orderText

         val loose_haveCount = specifics.loose_haveCount.toString()
         val loose_wantCount = specifics.loose_wantCount.toString()
         val loose_sellCount = specifics.loose_sellCount.toString()

         // set yes/no text based on count
         val new_haveTheFigure = if (specifics.new_haveCount == 0) noText else yesText
         val new_wantTheFigure = if (specifics.new_wantCount == 0) noText else yesText
         val new_sellTheFigure = if (specifics.new_sellCount == 0) noText else yesText
         val new_orderTheFigure = if (specifics.new_orderCount == 0) noText else yesText

         val loose_haveTheFigure = if (specifics.loose_haveCount == 0) noText else yesText
         val loose_wantTheFigure = if (specifics.loose_wantCount == 0) noText else yesText
         val loose_sellTheFigure = if (specifics.loose_sellCount == 0) noText else yesText

         val notes = specifics.notes

         // formatted value
         var newValueString = kUnknownMTBValue
         val currencyFormat = NumberFormat.getCurrencyInstance()
         currencyFormat.maximumFractionDigits = 2
         currencyFormat.currency = Currency.getInstance("USD")
         if (figure.saleSummary != null) {
             val formattedValue =
                 currencyFormat.format(figure.saleSummary!!.estimatedValueMean).toString()
             newValueString =
                 context?.getString(R.string.saleSummaryValueCount,
                     formattedValue,
                     figure.saleSummary!!.saleCount).toString()
         }

         // need to escape , with \" in front and back, such as in wave and names.
         val row: String = "\"${figure.series.seriesName}\"," +
                 "${figure.figureUniqueId}," +
                 "${figure.debutYear}," +
                 "\"${figure.phase}\"," +
                 "\"${figure.wave}\"," +
                 "\"${figure.figurePackageName}\"," +
                 "\"${figure.scene}\"," +
                 "\"$newValueString\"," +
                 "$new_haveTheFigure,$new_haveCount," +
                 "$new_wantTheFigure,$new_wantCount," +
                 "$new_sellTheFigure,$new_sellCount," +
                 "$new_orderTheFigure,$new_orderCount," +
                 "\"$new_orderText\"" +
                 ",$loose_haveTheFigure,$loose_haveCount," +
                 "$loose_wantTheFigure,$loose_wantCount," +
                 "$loose_sellTheFigure,$loose_sellCount," +
                 "\"$notes\"" + "\n"

         fileWriter.append(row)
     }

 } catch (e: Exception) {
     println("Writing CSV error!")
     e.printStackTrace()
 }

 fileWriter!!.close()

 createFile(contentUri)

 val shareIntent: Intent = Intent().apply {
     action = Intent.ACTION_SEND
     putExtra(Intent.EXTRA_STREAM, pickerInitialUri)
     type = "text/plain"
     setDataAndType(pickerInitialUri, requireContext().contentResolver.getType(pickerInitialUri))
 }
 startActivity(Intent.createChooser(shareIntent, "My Toy Box"))