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OpenKeychain is an OpenPGP implementation for Android.
I don't know what features you are looking for in encryption software but OpenKeychain is foss, audited and works just fine if you just want basic encryption/decryption/signing.
Multi-platform transparent client-side encryption of your files in the cloud
Access the most powerful time series database as a service. Ingest, store, & analyze all types of time series data in a fully-managed, purpose-built database. Keep data forever with low-cost storage and superior data compression.
Cryptomator for Android
Cryptomator for Android (by coss2)
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
Free, open-source encryption software for Windows and Android
2 projects | reddit.com/r/privacy | 2 May 2022
Should i encrypt my file when using a "secure cloud"?
2 projects | reddit.com/r/PrivacyGuides | 2 Oct 2021
[Software] Help me find a notepad with encryption as a backup method to store my passwords
2 projects | reddit.com/r/privacy | 7 Mar 2023
anyone else get the NFC where it won't scan?
1 project | reddit.com/r/Freestylelibre | 1 Mar 2023
Boxcryptor e2e encryption alternative for Android besides Cryptomator
2 projects | reddit.com/r/privacy | 28 Feb 2023