Android ViewModel inside Service (Alternative)

问题:

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

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

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

But as you know this can be only AppCompat or Fragment

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);
    }
});

回答1:

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