java代码中使用kotlin时void无法转换为Unit - android

Question

我正在我的项目中一起工作kotlin，我有一个如下所示的java课程：kotlin

class AuthenticationPresenter @Inject constructor(
    private val navigator: AuthenticationNavigator,
    private val getCurrentServerInteractor: GetCurrentServerInteractor,
    private val getAccountInteractor: GetAccountInteractor,
    private val settingsRepository: SettingsRepository,
    private val localRepository: LocalRepository,
    private val tokenRepository: TokenRepository
) {
    suspend fun loadCredentials(newServer: Boolean, callback: (authenticated: Boolean) -> Unit) {
        val currentServer = getCurrentServerInteractor.get()
        val serverToken = currentServer?.let { tokenRepository.get(currentServer) }
        val settings = currentServer?.let { settingsRepository.get(currentServer) }
        val account = currentServer?.let { getAccountInteractor.get(currentServer) }

        account?.let {
            localRepository.save(LocalRepository.CURRENT_USERNAME_KEY, account.userName)
        }

        if (newServer || currentServer == null || serverToken == null || settings == null || account?.userName == null) {
            callback(false)
        } else {
            callback(true)
            navigator.toChatList()
        }
    }
}

我正在将以下代码（kotlin）转换为java：

presenter.loadCredentials(newServer || deepLinkInfo != null) { authenticated ->
    if (!authenticated) {
        showServerInput(deepLinkInfo)
    }
}

这是我将代码转换为 java 但出现错误：

presenter.loadCredentials((newServer || deepLinkInfo != null), authenticated ->{
    if (!authenticated) {
        showServerInput(deepLinkInfo);
    }
});

但请说我：Missing return statement

loadCredentials我可以在java代码中使用什么？

代码showServerInput：

fun showServerInput(deepLinkInfo: LoginDeepLinkInfo?) {
    addFragment(TAG_SERVER_FRAGMENT, R.id.fragment_container, allowStateLoss = true) {
        ServerFragment.newInstance(deepLinkInfo)
    }
}

Answer 1

之前的所有答案都没有包含您需要返回 Unit 实例的部分，一旦我这样做了，我就能够解决类似的问题。

原始问题有一个小问题，即“AA”无法返回，因此会抛出错误，而您需要调用一个方法。

以下是在这个问题的背景下如何做到这一点。

presenter.loadCredentials((newServer || deepLinkInfo != null), authenticated ->{
    if (!authenticated) {
        showServerInput(deepLinkInfo); // Here!
    } else {
        myOtherMethod();
    }
    return Unit.INSTANCE;
});

Answer 2

您需要返回以下结果showServerInput：

presenter.loadCredentials((newServer || deepLinkInfo != null), authenticated ->{
    if (!authenticated) {
        return showServerInput(deepLinkInfo); // Here!
    } else {
        return "AA";
    }
});