amalChandran / Trail Android

Smooth route animation over Google maps. Uses projection from Google maps to draw a route on an overlay layout. Can add multiple routes with different sytles while supporting pan and zoom of maps.

(Gif running @ 10fps. Check the video on youtube.)

Overlay polyline	Marker and polyline	With zoom

Setup

1. Add jitpack to the root build.gradle file of your project at the end of repositories.

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

2. Add the dependency

implementation 'com.github.amalChandran:trail-android:v1.51'

Usage

Place RouteOverlayView over your google map layout in xml. Make sure that the routeoverlayview covers the map completely. This is the view in which the routes will be drawn.

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <fragment
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="com.google.android.gms.maps.SupportMapFragment"/>
  <com.amalbit.trail.RouteOverlayView
    android:id="@+id/mapOverlayView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
</FrameLayout>

In your activity, create routes with three predefined styles as of now.

googleMap.setOnMapLoadedCallback(() -> {
    Route normalOverlayPolyline = new Route.Builder(mRouteOverlayView)
        .setRouteType(RouteType.PATH)
        .setCameraPosition(mMap.getCameraPosition())
        .setProjection(mMap.getProjection())
        .setLatLngs(mRoute)
        .setBottomLayerColor(Color.YELLOW)
        .setTopLayerColor(Color.RED)
        .create();

To make sure that the overlay moves along with the Google maps movement we need to add a hook from its cameramovelistener.

googleMap.setOnCameraMoveListener(() -> {
      mRouteOverlayView.onCameraMove(googleMap.getProjection(), googleMap.getCameraPosition());
    }
);

Library uses java 8 bytecode, so dont forget to enable java 8 in your application's build.gradle file.

android {
    compileOptions {
        sourceCompatibility 1.8
        targetCompatibility 1.8
    }
}

License

MIT © Amal Chandran

Logo

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