Apk not have asssets folder Or When running, have error: "TypeError: cc.Class is undefined" (cocos2dx v3.17 js project, run with gradle version 4.6 and android plugin version 3.2.1)

[zerominh]

Reason: in gradle 4.6, merge assets is changed to folder merged_assets, not in assets folder
I fixed it with modify build.gradle file:
copy {
println("copy " + Paths.get("${buildDir}", "/../../../../../res") + " ===> " + Paths.get("${buildDir}",
"/intermediates/merged_assets/${variant.dirName}/merge${variant.dirName}Assets/out/res"))
// from "${buildDir}/../../../../../res"
// into "${buildDir}/intermediates/assets/${variant.dirName}/res"
from(Paths.get("${buildDir}", "/../../../../../res"))
into(Paths.get("${buildDir}", "/intermediates/merged_assets/${variant.dirName}/merge${variant.dirName}Assets/out/res"))
}
Another "copy {}" lines and "delete" line is modified similarly

[ghost]

android.applicationVariants.all { variant ->
    def project_root_folder = "${buildDir}/../../../../.."
    def dest_assets_folder = "${buildDir}/intermediates/merged_assets/${variant.dirName}/out"

    // delete previous files first
    delete dest_assets_folder

    variant.mergeAssets.doLast {
        copy {
           from project_root_folder + "/res"
           into dest_assets_folder + "/res"
        }

        copy {
            from project_root_folder + "/src"
            into dest_assets_folder + "/src"
        }

        copy {
            from project_root_folder + "/frameworks/cocos2d-x/cocos/scripting/js-bindings/script"
            into dest_assets_folder + "/script"
        }

        copy {
            from project_root_folder + "/main.js"
            from project_root_folder + "/project.json"
            into dest_assets_folder
        }

        // compile the scripts if necessary
        def compileScript = (variant.name.compareTo('release') == 0)
        if (project.hasProperty('PROP_COMPILE_SCRIPT')) {
            compileScript = (PROP_COMPILE_SCRIPT.compareTo('1') == 0)
        }

        if (compileScript) {
            compileJS(dest_assets_folder, dest_assets_folder)
        }
    }
}

[minggo]

I don't quite understand this issue, could some one send a PR? Thanks.