服务内的Android ViewModel(可选) [英] Android ViewModel inside Service (Alternative)

问题描述

我有一项服务，可提供大多数时间对用户可见的UI.

I have a service which provides UI that is visible to user most of the time.

遇到问题时，我正在尝试新的应用程序体系结构.

I was experimenting with new Application Architecture when I came with a problem.

MyModelviewModel viewModel = ViewModelProviders.of(this).get(MyModelviewModel.class);

但是您知道this只能是AppCompat或Fragment

有其他选择吗?或者我可以像将Im放在ViewModel

Is there some alternative? or can I put observer directly on my LiveData like Im puting on ViewModel

viewModel.getList().observe(Playground.this, new Observer<List<TestEntity>>() {
    @Override
    public void onChanged(@Nullable List<TestEntity> items) {
        recyclerViewAdapter.addItems(items);
    }
});

推荐答案

LiveData可以独立使用，而无需ViewModel，可以在提供适当的LifecycleOwner实例的同时使用observeForever(Observer<T> observer)或observe(LifecycleOwner owner, Observer<T> observer)，您可以在服务或视图中实现LifecycleOwner.

LiveData can be use independently without ViewModel,you can use observeForever(Observer<T> observer), or observe(LifecycleOwner owner, Observer<T> observer) while you provide a proper LifecycleOwner instance, you can implement LifecycleOwner in your service or view.

ViewModelProviders仅为每个Fragment或Activity提供ViewModel的缓存，您可以直接通过new MyModelviewModel()创建ViewModel.

ViewModelProviders just provides a cache of ViewModel for each Fragment or Activity, you can create your ViewModel directly by new MyModelviewModel().

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