MarkerBuilder

MarkerBuilder is now a modern Android sample and reusable library for building draggable geofence circles on Google Maps with Jetpack Compose and the latest Maps Compose API.

What's new

• Android Gradle Plugin 8.13.2 with Gradle 8.14.4
• Kotlin 2.2.21
• Jetpack Compose UI app sample
• Google Maps Compose 8.3.0
• Kotlin-first geofence state manager with unit tests
• Removed deprecated support libraries, legacy map fragments, and obsolete permissions

Project structure

• app: a Compose demo app that renders circles and draggable handles with GoogleMap
• geofencemarkerbuilder: a reusable state manager and geometry utilities for draft and saved geofence circles

Running the sample

1. Install Android SDK 36 or later.
2. Add a Google Maps key to local.properties:

MAPS_API_KEY=YOUR_API_KEY

3. Build the project:

./gradlew testDebugUnitTest assembleDebug

Compose sample behavior

• Tap anywhere on the map to create a draft circle.
• Drag the center marker to move the circle.
• Drag the resize handle to change the radius.
• Seed saved circles with the bottom sheet action to test multiple overlays.
• Lock marker editing from the top bar to inspect without changing geometry.

Library usage

val manager = MarkerBuilderManagerV2.Builder()
    .enabled(true)
    .radius(220.0)
    .minRadius(50)
    .maxRadius(1500)
    .build()

manager.markThis(point = LatLng(14.5995, 120.9842), isSaved = false)
manager.plotPoints(
    point = LatLng(14.6080, 120.9822),
    radius = 280,
    circularGeofenceId = 1001L,
    fillColor = 0x334CAF50.toInt(),
)

Collect manager.uiState from Compose or any other UI layer to render circles and marker handles.

License

Copyright 2015 A-Ar Andrew Concepcion

Licensed under the Apache License, Version 2.0.