Identity verification apps for banking and SIM registration require clear, high-resolution face captures to detect spoofing and deepfakes. Capturing frames sharp enough for liveness and anti-spoofing checks, without crashing low-memory devices, is a common challenge for Android camera developers.
For SmileID, a leading identity verification SDK in Africa, this challenge is doubled by a diverse hardware ecosystem. Android represents 85% of SmileID’s target devices market share, including entry-level smartphones with highly constrained processors, obscure regional models, and ruggedized custom Point of Sale (POS) terminals.
Before adopting CameraX, SmileID faced standard but daunting camera engineering hurdles: stretched preview feeds, rotated sensor orientations, out-of-memory (OOM) crashes, and custom original equipment manufacturer (OEM) bugs. By migrating their core Android SDKs to CameraX, SmileID transformed these challenges into a major business advantage.
According to SmileID, migrating their Android SDKs to CameraX delivered the following results:
To confirm that a user is who they claim to be, SmileID’s SDK must capture high-resolution selfie frames for on-device liveness checks and cloud-based deepfake detection.
Under legacy Camera1 and low-level Camera2 API implementations, achieving this consistently was difficult for several reasons:
Because of these friction points, SmileID's year-over-year SDK adoption growth was limited to 2-3x, and many verifications had to fall back to uploading static photos over a high-latency REST API instead of running real-time on-device liveness checks.
SmileID re-engineered their Mobile SDKs from the ground up using CameraX, which is built specifically to abstract away the complexity of the underlying device ecosystem and provide a consistent, natively lifecycle-aware developer interface.
Using CameraX's core use cases (specifically Preview and ImageAnalysis) SmileID built a robust, dual-purpose camera pipeline:
To capture ultra-sharp details for deepfake detection without causing OOM crashes, SmileID added CameraX’s modern ResolutionSelector API directly to their ImageAnalysis configuration. It lets developers request a target resolution and choose a fallback rule when a device does not support that exact size. For example, the following diagram and sample configuration illustrate how ResolutionSelector evaluates candidate sizes around a 1200×900 target:
Here is the corresponding sample code showing how you can pair ResolutionSelector with STRATEGY_KEEP_ONLY_LATEST in your own app (use FALLBACK_RULE_CLOSEST_HIGHER_THEN_LOWER to prioritize sharpness, or FALLBACK_RULE_CLOSEST_LOWER_THEN_HIGHER to cap memory usage):
By requesting high-density pixel frames and processing them locally, SmileID achieved a 4x increase in captured selfie resolution. SmileID also compressed the cropped face region on the device so the network upload size stayed identical to their previous system. This architecture guaranteed sharper data for their machine learning models without increasing cellular data costs for their users.
Standardizing on CameraX meant SmileID could rely on two layers of compatibility engineering to keep their SDK stable across devices:
CameraX's compatibility is backed by continuous, physical hardware verification. In Google's dedicated Camera and Media Test Lab, an automated test suite runs daily across a massive, rotating matrix of over 190 physical Android device models. This includes devices representing different chipsets, OS versions, and hardware capabilities.
To move toward more consistent behavior across popular devices, Google's Camera and Media Test Lab automatically catches library regressions before they can affect your production code.
Different Android devices have different physical limitations. Some might fail to set custom exposure settings, while others might report inverted image data when using certain aspect ratios. To prevent developers from polluting their codebases with complex conditional blocks based on device manufacturer and model, CameraX maintains internal device quirk classes such as DeviceQuirks and CameraQuirks in camera-camera2 (DeviceQuirksLoader.kt). When CameraX detects a device with a known issue, it automatically injects a tailored workaround. For SmileID, this meant their SDK could work reliably across 18,000+ Android device types without needing device-specific patches in their codebase.
By migrating to CameraX, SmileID simplified SDK integration for external app developers.
Eliminating aspect ratio distortions, laggy previews, and sudden OOM crashes drove a 20% increase in verification pass rates for services using their SDKs. For financial institutions and mobile money apps across Africa, a 20% increase in pass rates means hundreds of thousands of legitimate users successfully onboarding instead of churning.
Developers took notice. The ease of integrating the CameraX-based SDK triggered a 15x adoption surge in the first year, climbing to 20x adoption by the second year. To date, SmileID has successfully processed over 160 million identity verifications using CameraX.
Developing for cameras doesn't have to be hard. To help your team adopt the same CameraX patterns SmileID used, Android has launched the CameraX Skill for AI coding agents.
When you use the CameraX Skill in your development environment, AI coding agents such as Gemini apply current CameraX patterns for migration, lifecycle binding, ConcurrentCamera, and MlKitAnalyzer. Whether you are setting up dual-camera feeds, configuring a preview with PreviewView or CameraXViewfinder, or managing real-time machine learning (ML) analysis, the CameraX Skill guides your agent to generate precise, production-ready code.
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