如何更新 ViewModel LifeCycle 和 recyclerview

Question

My ViewModel class:

public class MyViewModel extends AndroidViewModel { ...

I'm initialization from Activity:

private void initializeViewModel() {
viewModel = ViewModelProviders
        .of(this, new ViewModelFactory(this.getApplication(), argsSelect))
        .get(MyViewModel.class);

viewModel.getLogsList().observe(this, new Observer<List<DebugMessage>>() {
    @Override
    public void onChanged(@Nullable List<DebugMessage> debugMessages) {
        logAdapter.addItems(debugMessages);
    }
});

}

My argument ( argsSelect ) changes real time. How me update ViewModel and RecyclerView with new SELECT based on current arguments?

Answer 1

If you are using Room to load internal data, you have to return a LiveData.

@Query("SELECT * FROM user")
fun getAll(): LiveData<MutableList<User>>

Every change in your DB will call your observer, so you don't need to worry about it.