Concepts

The handful of ideas the Android SDK assumes you understand. Read these once and the API stops surprising you.

• Authentication — you authenticate as the integrator; on-device credential options and the credential gate.
• Enroll, verify, identify — three operations, three problem shapes.
• Fingerprint enrollment — why enrolling a finger takes two captures.
• Device discovery — how USB readers are detected, permissioned, and tracked.
• Capture lifecycle — the reader state machine and the Kotlin flows you collect.

The biometric model (two-step enrollment, partial/full status, 1:N semantics) is defined by the Slade ID service.