Android Maps Ktx

Android Maps KTX Agent Skill

This skill provides verified patterns, gotchas, and reference implementations for developing with the Android Maps KTX and Android Maps Utility KTX libraries (maps-ktx and maps-utils-ktx).

It guides you in writing concise, idiomatic Kotlin using coroutines and Flows to manage map lifecycles, viewport transitions, satellite location streams, marker cluster events, and custom styled overlay click collections.

📋 Triggers & Scenarios

Use when:

• Implementing or refactoring Android map interfaces using Kotlin coroutines or Kotlin Flows.
• Consuming reactive satellite location updates (LocationManager) with automatic subscriber lifecycles.
• Listening to marker group click events or individual pin clicks using ClusterManager event streams.
• Managing click callbacks across distinct, styled sub-collections using MarkerManager or CircleManager.
• Creating pixel-perfect visual previews or automated .gif animations of map interactions using adb shell inputs.

Don't use for:

• Standard Java-based Google Maps SDK for Android development.
• Web Map developments (Maps JavaScript API) or iOS Maps integrations.
• General Android location services unrelated to Google Maps rendering or KTX.

🎯 Idiomatic KTX Core Capabilities

The Android Maps KTX libraries replace legacy callback-heavy interfaces with clean Kotlin-first abstractions. Refer to the following deep guides for implementations:

1. Critical Gotchas & Stability Workarounds

• The Single-Subscriber Invariant: Learn why multiple direct subscribers to a KTX cold flow will hijack the listener slot or break on cancellation, and how to safely multicast using .shareIn().
• SystemUI Tuner Stability: Learn how to set clean status bars in Android 15+ (SDK 37) without triggering fatal tuner repository crashes.
• Mock Location Lifecycle: Understand why mock providers must be created before activity subscription.
• 📂 Gotchas & Stability Reference

2. Reactive Location Streaming

• Cold flows for fine GPS location tracking and coarse cell/wifi tower tracking.
• Auto-cleanup of test location providers and lifecycle-safe subscriptions.
• adb coordinates injection for London (Fine GPS) and Paris (Coarse network) trajectories.
• 📂 Location Streams Reference

3. Marker Clustering Click Streams

• Subscribing to group cluster click viewport glides via clusterClickEvents().
• Multicasting individual marker clicks safely across dual observers via clusterItemClickEvents() and SharedFlow.
• adb touch badges simulations.
• 📂 Clustering click flows Reference

4. Shape & Overlay Click Collections

• Propagating click events in clean, isolated sub-collections via KTX collection click extensions.
• Visual click confirmation rules (Persistent InfoWindows, interactive circle color-swapping on-device).
• 📂 Collection Click Flows Reference