LiveDataReactiveStreams 到 MutableLiveData

Question

如何将值从 LiveDataReactiveStreams 发布到 MutableLiveData？我想实现双向数据绑定到 Switch（视图）并将“检查”值从数据库传递到 MutableLiveData 和 UI。 LiveDAtaReactiveStreams 仅返回不可变的 LiveData。

//ViewModel
public final MutableLiveData<Boolean> switchChecked = new MutableLiveData<>();

LiveData<Boolean> data = LiveDataReactiveStreams.fromPublisher(/* Flowable from DB */); //??


//xml
<Switch
  ...
  android:checked="@={viewModel.switchChecked}"
/>

Answer 1

试试MediatorLiveData

//ViewModel
public final MediatorLiveData<Boolean> switchChecked = new MediatorLiveData<>();

public MyViewModel() {
    ...

    switchChecked.addSource(LiveDataReactiveStreams.fromPublisher(/* Flowable from DB */), value -> {
        switchChecked.setValue(value);
    });

    ...
}