如何使用Kotlin将文件移动到Android的内部存储(预留的应用内存)？

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import java.io.IOException

fun moveFileToInternalStorage(sourceFilePath: String, destinationFileName: String) {
    val sourceFile = File(sourceFilePath)
    val destinationDir = applicationContext.filesDir // 获取应用的内部存储目录
    val destinationFile = File(destinationDir, destinationFileName)

    try {
        FileInputStream(sourceFile).use { inputStream ->
            FileOutputStream(destinationFile).use { outputStream ->
                val buffer = ByteArray(1024)
                var length: Int
                while (inputStream.read(buffer).also { length = it } > 0) {
                    outputStream.write(buffer, 0, length)
                }
            }
        }
    } catch (e: IOException) {
        e.printStackTrace()
    }
}

val sourceFilePath = "/sdcard/example.txt" // 外部存储中的文件路径
val destinationFileName = "example.txt" // 目标文件名
moveFileToInternalStorage(sourceFilePath, destinationFileName)