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okay, let's dive deep into android storage systems. this tutorial will cover various storage options available in android, their use cases, best practices, and code examples. we'll cover:

*1. overview of android storage options*

*internal storage:* private to the app, accessible only by the app itself. used for sensitive data or app-specific files.
*external storage:* part of the device's file system accessible by other apps (subject to permissions). typically used for larger media files, shared files, or files you want the user to access. can be emulated or removable (e.g., sd card).
*shared preferences:* a simple mechanism for storing key-value pairs of primitive data (booleans, integers, floats, strings). suitable for small amounts of app settings or user preferences.
*databases (sqlite):* a robust and structured way to store data within your app. good for complex data structures and relationships.
*network storage (cloud):* storing data on remote servers, using services like firebase, aws, or custom apis. useful for sharing data across devices or backing up data.
*mediastore:* a system service that provides a centralized repository for media files (images, audio, video) on the device. apps can query and contribute to the mediastore.

*2. internal storage*

*characteristics:*
private and secured.
accessible only by your app.
data is deleted when the app is uninstalled.
ideal for storing sensitive data, app-specific data that shouldn't be exposed.
*how to use:*

`getfilesdir()`: returns the absolute path to the directory on the filesystem where files created with `openfileoutput()` are stored. this is for regular files.
`getcachedir()`: returns the absolute path to the directory on the filesystem that should be used to store temporary cache files. the system may delete these files when storage is low.

*code example (writing and reading a file):*

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