R8 and Proguard Rules

问题

I am using https://github.com/amalChandran/trail-android this library in my android project. The animation was working perfectly fine. But, after enabling R8, the animation is not working. The library does not have any Proguard suggestion. I added the following block in one of my method,

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();
map.setOnCameraMoveListener(() -> mRouteOverlayView.onCameraMove(map.getProjection(), map.getCameraPosition()));

Where I have two global variables defined,

public Route route;
public RouteOverlayView mRouteOverlayView;

Now, I have some details in my usage.txt

public void onCameramove(com.google.android.gms.maps.GoogleMap,com.obhai.polyline.trail.RouteOverlayView)

Is there any way to write something in proguard-rules.pro so that R8 doesn't remove this part?

回答1:

Thanks to @sgjesse for his hint. I finally got my narrowed down proguard rule to keep my feature functioning.

-keep class com.amalbit.trail.AnimationRouteHelper { *;}

adding this rule served my purpose.

来源：https://stackoverflow.com/questions/63110559/r8-and-proguard-rules