EmojiCompat with custom emoji font

TwemojiConfig.kt

// See also https://android.googlesource.com/platform/frameworks/support/+/android-cts-9.0_r5/emoji/bundled/src/main/java/androidx/emoji/bundled/BundledEmojiCompatConfig.java

class TwemojiConfig(ctx: Context) : EmojiCompat.Config(BundledMetadataLoader(ctx)) {

    class BundledMetadataLoader(ctx: Context) : EmojiCompat.MetadataRepoLoader {
        private val mContext = ctx.applicationContext

        override fun load(cb: EmojiCompat.MetadataRepoLoaderCallback) {
            val runnable = InitRunnable(mContext, cb)
            val thread = Thread(runnable)
            thread.isDaemon = false
            thread.start()
        }
    }

    class InitRunnable(ctx: Context, cb: EmojiCompat.MetadataRepoLoaderCallback) : Runnable {
        val mContext = ctx
        val mLoaderCallback = cb

        override fun run() {
            try {
                val assetManager = mContext.assets
                val resourceIndex = MetadataRepo.create(assetManager, "TwemojiCompat.ttf")
                mLoaderCallback.onLoaded(resourceIndex)
            } catch (t: Throwable) {
                mLoaderCallback.onFailed(t)
            }
        }
    }

}