在android UI中显示当前数据，无需刷新和延迟

public class MyViewModel extends ViewModel {
    private MutableLiveData<String> currentData;

    public LiveData<String> getCurrentData() {
        if (currentData == null) {
            currentData = new MutableLiveData<>();
        }
        return currentData;
    }

    public void setCurrentData(String data) {
        if (currentData != null) {
            currentData.setValue(data);
        }
    }
}

public class MyActivity extends AppCompatActivity {
    private MyViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

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

        // 观察数据的变化
        viewModel.getCurrentData().observe(this, new Observer<String>() {
            @Override
            public void onChanged(@Nullable String data) {
                // 更新UI
                updateUI(data);
            }
        });
    }

    private void updateUI(String data) {
        // 在UI中显示当前数据
        TextView textView = findViewById(R.id.textView);
        textView.setText(data);
    }
}

// 在某个地方更新数据
viewModel.setCurrentData("新的数据");