API User-Agent

public static String generateUserAgent() {
        StringBuilder builder = new StringBuilder("Android/");
        builder.append(Build.VERSION.SDK_INT);
        builder.append(" ");
        builder.append(Build.BRAND.replace(" ", "_"));
        builder.append("/");
        builder.append(Build.MODEL.replace(" ", "_"));
        builder.append(" ");
        builder.append(Build.MANUFACTURER.replace(" ", "_"));
        builder.append("/");
        builder.append(Build.PRODUCT);
        if (!TextUtils.isEmpty(BuildConfig.FLAVOR)) {
            builder.append(" ");
            builder.append(BuildConfig.FLAVOR.replace(" ", "_"));
        }
        builder.append(" ");
        builder.append(BuildConfig.APPLICATION_ID);
        builder.append("/");
        builder.append(BuildConfig.VERSION_NAME);
        builder.append("(");
        builder.append(BuildConfig.VERSION_CODE);
        builder.append(")");

        return builder.toString();
    }