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android storage access framework (saf): a comprehensive tutorial
the storage access framework (saf) is android's recommended way to interact with external storage, especially from android 4.4 (api level 19) and beyond. it provides a user-friendly and secure method for apps to access files and directories, especially on external storage like sd cards and usb drives. compared to the older methods (like `getexternalstoragedirectory()`), saf offers several advantages:
*user control:* the user explicitly grants access to specific files or directories via a system-provided file picker. this empowers users to maintain control over their data.
*security:* saf sandboxes access, limiting what your app can do and preventing it from inadvertently accessing unintended files.
*cross-provider compatibility:* saf works with various storage providers, including local storage, cloud storage (like google drive, dropbox), and even custom providers. this makes your app more versatile.
*document-centricity:* saf treats files as documents, allowing apps to focus on the data they need rather than the underlying file system structure.
*no permissions for some operations:* for basic read/write operations on files the user has explicitly granted access to, you often don't need additional storage permissions in your app's manifest.
this tutorial will delve into the intricacies of saf, covering common use cases with detailed code examples in kotlin (but easily translatable to java).
*i. understanding the saf components*
before diving into code, let's define the key components of saf:
*`documentsprovider`:* the foundation of saf. it's a content provider that exposes files and directories as "documents" within a hierarchical structure. storage services like google drive, dropbox, and your device's internal storage each implement their own `documentsprovider`.
*`documentfile`:* a class that represents a file or directory exposed by a `documentsprovider`. ...
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