Question 1

Is MMKV really faster than SharedPreferences?

Accepted Answer

Yes, MMKV uses mmap and protobuf encoding, which benchmarks in the README show can be up to 100x faster for write operations compared to SharedPreferences' apply/sync model, especially under heavy loads.

Question 2

How do I migrate from SharedPreferences to MMKV?

Accepted Answer

You can manually transfer key-value pairs by reading from SharedPreferences and writing to MMKV using its similar API, but there's no automated migration tool provided. The README suggests using MMKV's straightforward methods for ease.

Question 3

Does MMKV support encryption for secure storage?

Accepted Answer

No, MMKV does not have built-in encryption. For sensitive data like passwords, you need to encrypt values before storing them in MMKV or use external security libraries, which adds development overhead.

Question 4

MMKV vs Room: which should I use for local storage?

Accepted Answer

MMKV is best for simple key-value data like user preferences, while Room is a full SQLite ORM for complex, queryable relational data. Choose MMKV for speed and simplicity, Room for structured data with joins.

Question 5

How to use MMKV with multi-process in Android?

Accepted Answer

Initialize MMKV with a multi-process mode (e.g., MMKV.multiProcessMode()) and ensure all processes access the same instance. The README's tutorials detail this, but it requires careful setup to avoid conflicts.

Question 6

Can I use MMKV in a React Native or Flutter app?

Accepted Answer

Yes, but indirectly via platform channels or native modules; there's no official plugin, so you'd need to bridge to native code on each platform, which can complicate cross-platform development.

MMKV

What is MMKV?

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