gomobile how to embed assets in apk

Question

When developing with gomobile for Android. How can I include assets (html, js, images) inside the apk file? I have a web server running inside the apk which works inside the apk as well as with go run, but when packaged inside the apk on the phone the service cannot find it's assets/static files.

Answer 1

You must put your assets within a directory called 'assets'.

See this example:

https://github.com/udhos/fugo/tree/master/demo/invader/assets

Then you can use the package golang.org/x/mobile/asset to load the desired asset:

import "golang.org/x/mobile/asset"

f, err := asset.Open("image.png")

Sample code taken from https://github.com/udhos/fugo/blob/master/demo/invader/main.go :

func loadFull(name string) ([]byte, error) {
    f, errOpen := asset.Open(name)
    if errOpen != nil {
        return nil, errOpen
    }
    defer f.Close()
    buf, errRead := ioutil.ReadAll(f)
    if errRead != nil {
        return nil, errRead
    }
    log.Printf("loaded: %s (%d bytes)", name, len(buf))
    return buf, nil
}