LiveDataReactiveStreams 到 MutableLiveData [英] LiveDataReactiveStreams to MutableLiveData

问题描述

如何将 LiveDataReactiveStreams 中的值发布到 MutableLiveData?我想实现到 Switch(视图)的双向数据绑定，并将检查"值从数据库传递到 MutableLiveData 以及从 UI 传递.LiveDataReactiveStreams 仅返回不可变的 LiveData.

How can I publish values from LiveDataReactiveStreams to MutableLiveData? I would like to implement two-way data binding to Switch (view) and pass "checked" value from database to MutableLiveData and from UI as well. LiveDAtaReactiveStreams returns immutable LiveData only.

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

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


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

推荐答案

Try MediatorLiveData

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

public MyViewModel() {
    ...

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

    ...
}

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