android-livedata

问题 I'm running an androidTest instrumentation test and I have a method that returns LiveData from a DAO object using Room. I'm calling the method like so: val animal = roomDatabase.animalsDao().getAnimal(1) animal.observeForever(mMockObserver) assertNotNull(animal.value) I used Mockito to mock the observer: @Mock private lateinit var mMockObserver = Observer<Animal> This should return an instance of LiveData containing the Animal at id 1, but it's null. It's my understanding that in order for

问题 I'm working on this project in Android in which an aspect requires a CountdownTimer with a foreground service. A few other answers on Stack Overflow mentioned that LocalBroadcastManager would be suitable for my needs. The documentation in Android Developers, however, mentions that it has been deprecated. Any suggestions on what I should use in its place? The documentation mentioned about using LiveData, but I was wondering if there are any easier alternatives. 回答1: LocalBroadcastManager is

问题 I'm working on this project in Android in which an aspect requires a CountdownTimer with a foreground service. A few other answers on Stack Overflow mentioned that LocalBroadcastManager would be suitable for my needs. The documentation in Android Developers, however, mentions that it has been deprecated. Any suggestions on what I should use in its place? The documentation mentioned about using LiveData, but I was wondering if there are any easier alternatives. 回答1: LocalBroadcastManager is

问题 I'm working on this project in Android in which an aspect requires a CountdownTimer with a foreground service. A few other answers on Stack Overflow mentioned that LocalBroadcastManager would be suitable for my needs. The documentation in Android Developers, however, mentions that it has been deprecated. Any suggestions on what I should use in its place? The documentation mentioned about using LiveData, but I was wondering if there are any easier alternatives. 回答1: LocalBroadcastManager is

问题 I'm working on this project in Android in which an aspect requires a CountdownTimer with a foreground service. A few other answers on Stack Overflow mentioned that LocalBroadcastManager would be suitable for my needs. The documentation in Android Developers, however, mentions that it has been deprecated. Any suggestions on what I should use in its place? The documentation mentioned about using LiveData, but I was wondering if there are any easier alternatives. 回答1: LocalBroadcastManager is

问题 I'm trying to trigger an update on LiveData from a coroutine: object AddressList: MutableLiveData<List<Address>>() fun getAddressesLiveData(): LiveData<List<Address>> { AddressList.value = listOf() GlobalScope.launch { AddressList.value = getAddressList() } return AddressList } but I get the following error: IllegalStateException: Cannot invoke setValue on a background thread Is there a way to make it work with coroutines? 回答1: Use liveData.postValue(value) instead of liveData.value = value .

问题 I'm trying to trigger an update on LiveData from a coroutine: object AddressList: MutableLiveData<List<Address>>() fun getAddressesLiveData(): LiveData<List<Address>> { AddressList.value = listOf() GlobalScope.launch { AddressList.value = getAddressList() } return AddressList } but I get the following error: IllegalStateException: Cannot invoke setValue on a background thread Is there a way to make it work with coroutines? 回答1: Use liveData.postValue(value) instead of liveData.value = value .

问题 I'm trying to trigger an update on LiveData from a coroutine: object AddressList: MutableLiveData<List<Address>>() fun getAddressesLiveData(): LiveData<List<Address>> { AddressList.value = listOf() GlobalScope.launch { AddressList.value = getAddressList() } return AddressList } but I get the following error: IllegalStateException: Cannot invoke setValue on a background thread Is there a way to make it work with coroutines? 回答1: Use liveData.postValue(value) instead of liveData.value = value .

来源： https://stackoverflow.com/questions/64352752/user-login-using-viewmodel-and-retrofit

来源： https://stackoverflow.com/questions/64352752/user-login-using-viewmodel-and-retrofit