A Kotlin Library for Drawing Routes on Google Maps for Android

Introducing DrawRoute: A Kotlin Library for Drawing Routes on Google Maps for Android. A compact way to draw routes in your Android app

I am happy to share DrawRoute, an open source route-drawing library to be used with the Google Maps API for Android.

Tech stack: Kotlin, OkHttp, RxJava, and AndroidX.

Before Diving In

The library uses the Google Directions API to fetch route information when drawing on the map. It is not free and requires you to have a project with this API enabled as well as a billing account.

See how to get started.

A New Kotlin Library

This library is completely written in Kotlin and wraps on the boilerplate code involved in consuming the Google Directions API using reactive programming for more control and precision. It also exposes an extension function that can be used on the Google Maps object itself once the map is ready.

Integration steps

In your build.gradle file (project level), add the following in the allProjects block:

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

Then in your build.gradle (app level), add the following in the dependencies block:

dependencies {
    implementation 'com.github.malikdawar:drawroute:1.1-rx'
}

Once you’ve successfully integrated the Google Maps API and followed the integration steps above, you can call the drawRouteOnMap method that will draw the route on the map and return as an Rx-Disposable, which should be used to dispose of the executed subscription.

A helper moveCameraOnMapmethodis also added in the library used here to focus and zoom on the source location before drawing the route.

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