A breakdown of the four types of offline caches used in Android apps: in-memory cache, preferences cache (DataStore), database cache (Room), and file cache. Each type is explained with practical use cases, trade-offs, and guidance on when to use or avoid each. In-memory caches are fast but lost on process death; preferences suit single-instance persistent values; Room databases handle structured, relational offline-first data; and file caches are ideal for binary data like images or pre-fetched media files.
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