private static void shareAsEmail(final Context context, final String subject, final String body, @Nullable final Uri uri, @StringRes final int titleResourceId, final String receiver) {
        final String usedReceiver = receiver == null ? context.getString(R.string.support_mail) : receiver;
        final Intent intent = createShareIntentInternal(context, TYPE_EMAIL, subject, body, uri, usedReceiver);
        shareInternal(context, intent, titleResourceId);
    }
Standard message box + additional share button for file sharing
main/src/main/java/cgeo/geocaching/utils/ShareUtils.java