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问题：

我的活动在屏幕中间有共享按钮、共享标题、共享进程栏和容器，其中片段被替换。

所以我有活动的视图模型 - ActivityViewModel ，其中有以下可观察的：

val mNavigationToMainActivity = CompletableSubject.create()
val mNavigationToUsername = PublishSubject.create<Any>()
val mNavigationToPassword = PublishSubject.create<Any>()
val mNavigationToChangePassword = PublishSubject.create<LoginItem>()


val mProcessBar = PublishSubject.create<Int>()
val mContinueButtonEnabled = BehaviorSubject.createDefault(false)
val mContinueClick = PublishSubject.create<Any>()
val mChangeTitleSubject = BehaviorSubject.createDefault(false)
val mLoadingIndicatorSubject = BehaviorSubject.createDefault(false)

并且在调用 FragmentViewModel 的片段之间存在共享视图模型。所有片段都使用相同的视图模型

现在的问题是片段的视图模型如何访问活动的视图模型？例如，当用户单击登录按钮时，我希望 fragmentviewmodel 可以访问活动的加载程序，然后导航到下一个屏幕。

或者例如在输入有效时启用按钮

所以这就是我在这些之间进行交流的方式：

fun <T> PublishSubject<T>.bind(subject: PublishSubject<T>): Disposable {
    return subscribe({ subject.onNext(it) }, { throwable -> subject.onError(throwable) })
}

fun <T> BehaviorSubject<T>.bind(subject: BehaviorSubject<T>): Disposable {
    return subscribe({ subject.onNext(it) }, { throwable -> subject.onError(throwable) })
}

fun CompletableSubject.bind(subject: CompletableSubject): Disposable {
    return subscribe({ subject.onComplete() }, { throwable -> subject.onError(throwable) })
}

我让片段的视图模型来扩展活动的视图模型有点像基本视图模型

所以这是活动的视图模型

公开课 IntroViewModel : BaseViewModel() {

val mNavigationToMainActivity = CompletableSubject.create()
val mNavigationToUsername = PublishSubject.create<Any>()
val mNavigationToPassword = PublishSubject.create<Any>()
val mNavigationToChangePassword = PublishSubject.create<LoginItem>()


val mProcessBar = PublishSubject.create<Int>()
val mContinueButtonEnabled = BehaviorSubject.createDefault(false)
val mContinueClick = PublishSubject.create<Any>()
val mChangeTitleSubject = BehaviorSubject.createDefault(false)


fun bind(introViewModel: IntroViewModel){
    mNavigationToUsername.bind(introViewModel.mNavigationToUsername).addDisposable()
    mNavigationToPassword.bind(introViewModel.mNavigationToPassword).addDisposable()
    mNavigationToChangePassword.bind(introViewModel.mNavigationToChangePassword).addDisposable()
    mNavigationToMainActivity.bind(introViewModel.mNavigationToMainActivity).addDisposable()
    mProcessBar.bind(introViewModel.mProcessBar).addDisposable()
    mContinueButtonEnabled.bind(introViewModel.mContinueButtonEnabled).addDisposable()
}

fun continueClicked() {
    mContinueClick.onNext(Any())
}

} 这是片段

class ChangePasswordViewModel(private val userRepository: UserRepository)
    : IntroViewModel() {

并且在每个片段内部，我将活动的视图模型绑定到片段的视图模型

 viewModel = ViewModelProviders.of(activity!!, viewModelFactory).get(ChangePasswordViewModel::class.java)
        viewModel.start(2,arguments?.getParcelable(LoginItem::class.simpleName))
    ViewModelProviders.of(activity!!, viewModelFactory).get(IntroViewModel::class.java).apply {
        viewModel.bind(this)
    }

它很讨厌，我真的不喜欢它。你能帮我吗？

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0 回答 0