祝桥建设网站东莞网站建设制作厂
android的登录功能和前端一样，需要保存登录的用户信息。
- 创建一个工具类
// 用户工具类，用于管理用户登录状态和用户信息
object AppUserUtil {// 常量定义private const val LOGGED_FLAG = "logged_flag" // 登录状态的键名private const val USER_INFO = "user_info" // 用户信息的键名private const val TAG = "AppUserUtil" // 日志标签// 登录状态属性var isLogged: Boolean// 获取登录状态，默认值为 falseget() = DataStoreUtils.readBooleanData(LOGGED_FLAG, false)// 设置登录状态，并同步保存到 DataStoreset(value) = DataStoreUtils.saveSyncBooleanData(LOGGED_FLAG, value = value)// 用户信息属性var userInfo: UserInfo?// 获取用户信息，从 DataStore 中读取并反序列化为 UserInfo 对象get() = DataStoreUtils.readStringData(USER_INFO).fromJson()// 设置用户信息，并同步保存到 DataStoreset(value) = DataStoreUtils.saveSyncStringData(USER_INFO, value = value?.toJson() ?: "")// 登录方法fun onLogin(userInfo: UserInfo) {isLogged = true // 设置登录状态为 truethis.userInfo = userInfo // 保存用户信息Log.d(TAG, "onLogin: $userInfo") // 打印登录日志}// 登出方法fun onLogOut() {isLogged = false // 设置登录状态为 falsethis.userInfo = null // 清空用户信息}
}
- 发起登录请求，登录成功，则调用工具类的onLgoin方法
private fun login() {viewModelScope.launch {flow {emit(service.login(viewStates.account.trim(), viewStates.password.trim()))}.map {if (it.errorCode == 0) {if (it.data != null) {HttpResult.Success(it.data!!)} else {throw Exception("the result of remote's request is null")}} else {throw Exception(it.errorMsg)}}.onEach {AppUserUtil.onLogin(it.result)_viewEvents.send(LoginViewEvent.PopBack)}.catch {_viewEvents.send(LoginViewEvent.ErrorMessage(it.message ?: ""))}.collect()}}
- 一些页面，如果未登录，是不能使用的，这个时候我们可以取出isLogged 属性进行判断。
@ExperimentalFoundationApi
@Composable
fun CollectPage(navCtrl: NavHostController,scaffoldState: ScaffoldState,viewModel: CollectViewModel = hiltViewModel()
) {val viewStates = viewModel.viewStatesval collectPaging = viewStates.pagingData?.collectAsLazyPagingItems()val webUrls = viewStates.urlListval titles = viewStates.titlesval isRefreshing = viewStates.isRefreshingval listState =if ((collectPaging?.itemCount ?: 0) > 0) viewStates.listState else LazyListState()DisposableEffect(Unit) {Log.i("debug", "onStart")viewModel.dispatch(CollectViewAction.OnStart)onDispose {}}Column(modifier = Modifier.fillMaxSize().padding(bottom = BottomNavBarHeight)) {AppToolsBar(title = "我的收藏")if (!AppUserUtil.isLogged) {EmptyView(tips = "点击登录",imageVector = Icons.Default.Face) {RouteUtils.navTo(navCtrl, RouteName.LOGIN)}} else {collectPaging?.let {RefreshList(it, listState = listState, isRefreshing = isRefreshing, onRefresh = {viewModel.dispatch(CollectViewAction.Refresh)}) {if (!webUrls.isNullOrEmpty()) {stickyHeader {ListTitle(title = titles[1].text)}item {FlowRow(modifier = Modifier.padding(10.dp)) {webUrls?.forEachIndexed { index, website ->LabelTextButton(text = website.name ?: "标签",modifier = Modifier.padding(end = 10.dp, bottom = 10.dp),onClick = {RouteUtils.navTo(navCtrl,RouteName.WEB_VIEW,WebData(website.name, website.link!!))})}}}}stickyHeader {ListTitle(title = titles[0].text)}if (collectPaging.itemCount > 0) {items(collectPaging) { collectItem ->CollectListItemView(collectItem!!,onClick = {RouteUtils.navTo(navCtrl,RouteName.WEB_VIEW,WebData(collectItem.title, collectItem.link))})}}}}}}
}
参考资料：
- https://github.com/RicardoJiang/wanandroid-compose