> For the complete documentation index, see [llms.txt](https://multiset.gitbook.io/multiset/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://multiset.gitbook.io/multiset/native-support/android-native/api-reference.md).

# API Reference

This section provides detailed API documentation for the MultiSet Android SDK components.

## Configuration

### [LocalizationConfig](/multiset/native-support/android-native/api-reference/localizationconfig.md)

A singleton object that provides centralized configuration for the MultiSet SDK localization behavior. Controls timing, quality, and feature settings for AR localization activities.

**Key Features:**

* Localization behavior settings (auto-localize, background localization, relocalization)
* Multi-frame capture configuration
* Confidence thresholds
* GPS hint integration
* Localization hints (map subset, position, floor height, search radius, 2D filtering)
* Runtime, persisted configuration via the in-app Settings dialog
* UI feedback options
* Image quality settings

### [ObjectTrackingConfig](/multiset/native-support/android-native/api-reference/objecttrackingconfig.md)

A singleton object that provides centralized configuration for the MultiSet SDK object tracking behavior. Controls how `ObjectTrackingActivity` detects and tracks pre-registered physical objects in AR.

**Key Features:**

* Object code registration (up to 10 objects)
* Auto-tracking and background tracking settings
* Confidence threshold filtering
* Re-tracking on AR loss
* Image quality settings

***

## Quick Reference

| Component                | Description                                             |
| ------------------------ | ------------------------------------------------------- |
| `LocalizationConfig`     | Centralized configuration for localization behavior     |
| `ObjectTrackingConfig`   | Centralized configuration for object tracking behavior  |
| `MultiSetSDK`            | Main SDK entry point for initialization                 |
| `MultiSetConfig.Builder` | Configuration builder for SDK setup                     |
| `MultiSetCallback`       | Interface for SDK event callbacks                       |
| `LocalizationResult`     | Result object containing pose data from localization    |
| `ObjectTrackingResult`   | Result object containing pose data from object tracking |
| `TrackingState`          | Enum for AR tracking states                             |

***

## MultiSetCallback Interface

The full set of callbacks delivered by the SDK:

| Callback                          | Trigger                                  |
| --------------------------------- | ---------------------------------------- |
| `onSDKReady()`                    | SDK initialized, authentication starting |
| `onAuthenticationSuccess()`       | Authentication successful                |
| `onAuthenticationFailure(error)`  | Authentication failed                    |
| `onLocalizationSuccess(result)`   | Localization succeeded                   |
| `onLocalizationFailure(error)`    | Localization failed                      |
| `onTrackingStateChanged(state)`   | AR tracking state changed                |
| `onObjectTrackingSuccess(result)` | Object tracked successfully              |
| `onObjectTrackingFailure(error)`  | Object tracking failed                   |

***

## Related

* [Sample Activities](/multiset/native-support/android-native/sample-activities.md)
* [Android Native Overview](/multiset/native-support/android-native.md)


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