No-Permission File I/O, Read & Save Files Easily in Modern Android App Development
https://DeveshRx.com
Stop struggling with external storage permissions! Learn how to master the Storage Access Framework API in modern Android app development to seamlessly read and save files on any device.
In this complete tutorial, we dive deep into handling file input and output (I/O) securely using the Android Storage Access Framework. Unlike the MediaStore API—which limits your app to public media folders—this framework acts as a secure middleman, allowing users to pick, save, and manage files anywhere on their external storage, including SD cards. You will learn how to trigger the system UI using Activity Result Contracts, safely retrieve the file URI (Universal Resource Identifier), and use the ContentResolver to open input and output streams. By the end of this video, you'll know exactly how to convert string data to byte arrays for writing, and how to parse incoming file data using a BufferedReader.
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📽️ Chapters
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00:00 - Introduction to Storage Access Framework (SAF)
00:38 - MediaStore API vs. Storage Access Framework API
01:13 - App Demo: Save & Read Files on External Storage
02:34 - How Android Handles External Storage Permissions
03:17 - How to Save Files to External Storage (CreateDocument)
04:16 - Write Data to File using OpenOutputStream & URI
05:08 - Launching the Save File UI Picker
05:51 - How to Read Files from External Storage (OpenDocument)
06:37 - Parse File Data with InputStream & BufferedReader
07:33 - Launching the Open File UI Picker
08:43 - Summary & Android External Storage Best Practices
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