A library to convert Uber's H3 geo-index to LatLng vertices for Kotlin Multiplatform Mobile iOS and android

Features

• Uber H3 in one interface
• Common interface available on KMM Shared

Requirements

• iOS
  • Deployment Target 9.0 or higher
• Android
  • minSdkVersion 21

Installation

Gradle Settings

Add this gradle settings into your KMP(Kotlin Multiplatform Project)

build.gradle.kts in shared

plugins {
    id("com.android.library")
    kotlin("multiplatform")
}

val h3Lib = "com.linecorp.abc:kmm-h3:0.1.7"

kotlin {
    android()
    ios {
        binaries
            .filterIsInstance<Framework>()
            .forEach {
                it.baseName = "shared"
                it.transitiveExport = true
                it.export(h3Lib)
            }
    }

    sourceSets {
        val commonMain by getting {
            dependencies {
                implementation(h3Lib)
            }
        }
        val commonTest by getting {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-annotations-common"))
            }
        }
        val androidMain by getting {
            dependencies {
                implementation(h3Lib)
                api(h3Lib)
            }
        }
        val androidTest by getting {
            dependencies {
                implementation(kotlin("test-junit"))
                implementation("junit:junit:4.13.2")
                implementation("androidx.test:core:1.0.0")
                implementation("androidx.test:runner:1.1.0")
                implementation("org.robolectric:robolectric:4.2")
            }
        }
        val iosMain by getting {
            dependencies {
                implementation(h3Lib)
                api(h3Lib)
            }
        }
        val iosTest by getting
    }
}

Project Settings

Android

• Copy and paste jniLibs folder into src/main in your project

iOS

• Cocoapods

1. Create Podfile with below setting in your project root.

   use_frameworks!
   
   platform :ios, '9.0'
   
   install! 'cocoapods', :deterministic_uuids => false
   
   target 'iosApp' do
       pod 'shared', :path => '../shared/'
   end

2. Run command pod install on the terminal

Usage

Get Geo Boundaries

Android

val h3Indexes = listOf(
    "87283082bffffff",
    "872830870ffffff",
    "872830820ffffff",
    "87283082effffff",
)
val polygons = H3.polygons(h3Indexes)

/*
[Polygon(h3Index=87283082bffffff, vertices=[LatLng(lat=37.78529347359727, lng=-122.41077092287513), LatLng(lat=37.79707086149341, lng=-122.40326874464051), LatLng(lat=37.80760100422449, lng=-122.41208776737979), ...
*/

iOS

let h3Indexes = [
    "87283082bffffff",
    "872830870ffffff",
    "872830820ffffff",
    "87283082effffff",
]

let polygons = H3.Companion().polygons(h3Indexes: h3Indexes)

print("polygons", polygons)

/*
[Polygon(h3Index=87283082bffffff, vertices=[LatLng(lat=37.78529347359727, lng=-122.41077092287512), LatLng(lat=37.79707086149341, lng=-122.4032687446405), LatLng(lat=37.80760100422449, lng=-122.41208776737977), ...
*/

TODO

• Get Geo Boundaries