init static method
Implementation
static Future<bool> init({
int? Function()? getSDKAppID,
String Function()? getLoginUser
}) async {
_appFileDir ??= Platform.isAndroid ? await getApplicationSupportDirectory() : await getApplicationDocumentsDirectory();
_appCacheDir = await getApplicationCacheDirectory();
_externalCacheDir ??= Platform.isAndroid ? await getExternalStorageDirectory() : null;
_getSDKAppID ??= getSDKAppID;
_getLoginUser ??= getLoginUser;
return true;
}