kotlinx-io provides interfaces representing data sources and destinations - Source and Sink, and in addition to the mutable Buffer the library also provides an immutable sequence of bytes - ByteString.

IO API for working with files and streams. TypesFunctionsProperties · Access · Denied · Exception · Link copied to clipboard · JVM · class AccessDeniedException(file: File, other: File? = null, reason: String? = null) : FileSystemException · An exception class which is used when we have not enough access for some operation. Since Kotlin 1.0 ·

April 14, 2023 - The Kotlin Standard Library provides ... with Kotlin. These include: Higher-order functions implementing idiomatic patterns (let, apply, use, synchronized, etc). Extension functions providing querying operations for collections (eager) and sequences (lazy). Various utilities for working with strings and char sequences. Extensions for JDK classes making it convenient to work with files, IO, and ...

February 13, 2024 - private void copyDatabase(Context context, String dbName) { File dbPath = context.getDatabasePath(dbName); if (dbPath.exists()) { return; } dbPath.getParentFile().mkdirs(); try { final InputStream inputStream = context.getAssets().open("databases/" + dbName); final OutputStream output = new FileOutputStream(dbPath); byte[] buffer = new byte[8192]; int length; while ((length = inputStream.read(buffer, 0, 8192)) > 0) { output.write(buffer, 0, length); } output.flush(); output.close(); inputStream.close(); } catch (IOException e) { Log.d(TAG, "Failed to open file", e); e.printStackTrace(); } } This method will read the db file from assets and write it to the application database folder. This is the code I got after auto-conversion to Kotlin

If a FileSystem needs to be accessed from multiple threads, an additional synchronization is required. ... Atomically renames source to destination overriding destination if it already exists. ... Creates a directory tree represented by the path. If path already exists then the method throws kotlinx.io...

Basic API for working with files. Until stated otherwise, types and functions provided by the library are not thread safe. #312 For wasmWasi target, directory listing (kotlinx.io.files.FileSystem.list) does not work with NodeJS runtime on Windows, as fd_readdir function is not implemented there.

Kotlin has inherited Java's fidgety (but very flexible) way of doing I/O, but with some simplifying extra features. We won't get into all of it here, so for starters, this is how to iterate through all the lines of a file (you'll need import java.io.File):

February 2, 2026 - The File class gains numerous Kotlin-specific extensions that eliminate boilerplate code while ensuring resources are properly closed.

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Kotlin has inherited Java's fidgety (but very flexible) way of doing I/O, but with some simplifying extra features. We won't get into all of it here, so for starters, this is how to iterate through all the lines of a file (you'll need import java.io.File):

There are a number of ways to read text files in Kotlin. While this approach isn’t recommended for large text files, it’s a simple way to read small-ish text files into a List<String>: import java.io.File fun readFile(filename: String): List<String> = File(filename).readLines() This is how you use that function to read the /etc/passwd file: val lines = readFile("/etc/passwd") And here are two ways to print all of those lines to STDOUT: lines.forEach{ println(it) } lines.forEach{ line -> println(line) } As a quick reference, here are a few other ways to read text files in Kotlin: fun readFi

April 28, 2026 - In this article, we saw the various ways of reading a file in Kotlin. Depending on the use case, we can either opt for reading the file line-by-line or reading it entirely as a text.

November 16, 2020 - Pure Kotlin libraries can be made to compile easily for whichever platform you are targeting your KN binary for. There are a growing number of libraries for KN and Kotlin Multiplatform, which also allows targeting of iOS, Android, JavaScript, etc. One thing that is still missing however from the Kotlin standard libraries for KN is basic File I/O.

February 15, 2023 - The Kotlin Standard Library provides ... with Kotlin. These include: Higher-order functions implementing idiomatic patterns (let, apply, use, synchronized, etc). Extension functions providing querying operations for collections (eager) and sequences (lazy). Various utilities for working with strings and char sequences. Extensions for JDK classes making it convenient to work with files, IO, and ...

January 27, 2019 - File IO library based on Posix API for Kotlin/Native - Archinamon/native-file-io

December 30, 2022 - The Kotlin Standard Library provides ... with Kotlin. These include: Higher-order functions implementing idiomatic patterns (let, apply, use, synchronized, etc). Extension functions providing querying operations for collections (eager) and sequences (lazy). Various utilities for working with strings and char sequences. Extensions for JDK classes making it convenient to work with files, IO, and ...

June 8, 2022 - For appending (adding) text to the current file, you should get a connection stream and enable appending on that stream. Please let me know If there is something in this article that needs more explaining or there is any type of error is it. You can download the full sample with the usage of Kotlin Coroutines here: https://github.com/Arrowsome/android-storage-io-sample