private static final String VERSION_FILENAME = "assetsversion.txt";

    private final MainActivity act;

    public DownloadAssets(MainActivity act){

        this.act = act;

    }

    private void copyFileOrDir(AssetManager assetManager, File target, String assetPath) throws IOException {

        try {

            FileUtils.writeStreamToFile(assetManager.open(assetPath), target);

        } catch(FileNotFoundException e) {

            /*

             * I can't find a better way to figure out whether an asset entry is

             * a file or a directory. Checking if assetManager.list(assetPath)

             * is empty is a bit cleaner, but SLOW.

             */

            if (!target.isDirectory() && !target.mkdir()) {

                throw new IOException("Unable to create directory "+target);

            }

            for (String asset : assetManager.list(assetPath)) {

                copyFileOrDir(assetManager, new File(target, asset), assetPath + "/" + asset);

            }

        }

    }

    @Override

    protected Boolean doInBackground(Object... params) {

        try {

            FileUtils.writeStreamToFile(act.getResources().openRawResource(R.raw.schemes_builtin), Schemes.getBuiltinSchemesFile(act));

            FileUtils.writeStreamToFile(act.getResources().openRawResource(R.raw.weapons_builtin), Weaponsets.getBuiltinWeaponsetsFile(act));

            FileUtils.resRawToFilesDir(act, R.array.teams, R.array.teamFilenames, Team.DIRECTORY_TEAMS);

            copyFileOrDir(act.getAssets(), FileUtils.getDataPathFile(act), "Data");

            copyFileOrDir(act.getAssets(), new File(FileUtils.getCachePath(act), VERSION_FILENAME), VERSION_FILENAME);

            return Boolean.TRUE;

        } catch(IOException e) {

            Log.e("DownloadAssets", e.getMessage(), e);

            return Boolean.FALSE;

        }

    }

    @Override

    protected void onPostExecute(Boolean result){

        act.onAssetsDownloaded(result);

    }