在所有ViewHolders上具有公共值的最佳方法

public class CommonViewModel extends ViewModel {
    private MutableLiveData<String> commonValue;

    public MutableLiveData<String> getCommonValue() {
        if (commonValue == null) {
            commonValue = new MutableLiveData<>();
        }
        return commonValue;
    }

    public void setCommonValue(String value) {
        if (commonValue != null) {
            commonValue.setValue(value);
        }
    }
}

public class MainActivity extends AppCompatActivity {
    private CommonViewModel commonViewModel;

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

        commonViewModel = ViewModelProviders.of(this).get(CommonViewModel.class);

        commonViewModel.getCommonValue().observe(this, new Observer<String>() {
            @Override
            public void onChanged(String value) {
                // 更新UI或执行其他操作
            }
        });
    }
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    private CommonViewModel commonViewModel;

    public MyViewHolder(View itemView) {
        super(itemView);
        commonViewModel = ViewModelProviders.of((FragmentActivity) itemView.getContext()).get(CommonViewModel.class);
    }

    public void bindData() {
        String value = commonViewModel.getCommonValue().getValue();
        // 使用共享的数据进行操作
    }
}