使用 Coroutines 的 ViewModel

ViewModel.kt

suspend fun getToken(): Token { ...... }

suspend fun verify(token, userName: String): Boolean { ...... }

suspend fun requestAndSaveUserData(userName: String): Result { ...... }

fun login(userName: String) {
    GlobalScope.launch {
        try {
            val token = getToken()
            val isLogin = verify(token, userName)
            if (isLogin) {
                val success = requestAndSaveUserData(userName)
                if (success) {
                    showLoginSuccess("Success")
                }
            }
            ......
        }
    }
}