java - 从使用反射获得的 RecyclerView 调用方法

Question

我需要访问使用第三方库创建的 RecyclerView 的方法。 我正在做的是使用 findViewById 获取 RecyclerView View :

ViewGroup mainView = mainActivity.getWindow().getDecorView().findViewById(android.R.id.content);
    if(feedView == null){
        Object okStreamRecyclerView =  mainView.findViewById(NEWSFEED_RECYCLER_ID);
        feedView = (okStreamRecyclerView.getClass().getSuperclass()).getSuperclass();
        scrollToTop(feedView);
    }

此时 feedView.getSimpleName 结果为 RecyclerView。然后我尝试使用以下方法将此 RecyclerView 滚动到顶部:

private void scrollToTop(Class feedView) {
        log("THE VIEW IS OF TYPE: "+feedView.getName()); // androidx.recyclerview.widget.RecyclerView
        try {
            Method method = feedView.getMethod("getLayoutManager");
            method.setAccessible(true);
            LinearLayoutManager layoutManager = (LinearLayoutManager) method.invoke(feedView);
            layoutManager.scrollToPositionWithOffset(0, 0);
        } catch (NoSuchMethodException e) {
           log("NO SUCH METHOD EXCEPTION",e);
        } catch (IllegalAccessException e) {
            log("ILLEGAL ACCESS EXCEPTION",e);
        } catch (InvocationTargetException e) {
            log("INVOCATION TARGET EXCEPTION",e);
        }
    }

但由于某种原因我收到以下错误:

IllegalArgumentException: Expected receiver of type androidx.recyclerview.widget.RecyclerView, but got java.lang.Class<androidx.recyclerview.widget.RecyclerView>

如何将类转换为预期的 RecyclerView？还有其他方法可以获取此 View 吗？

Answer 1

感谢@CommonsWare提示，我成功地使用反射调用了ScrollToPosition方法。这是我的具体情况下的工作代码，在其他情况下可能会更容易:

View okStreamRecyclerView = null;
            try {
                okStreamRecyclerView = mainView.findViewById(NEWSFEED_RECYCLER_ID);
                feedView = (okStreamRecyclerView.getClass().getSuperclass()).getSuperclass();
                Method method = feedView.getMethod("getLayoutManager");
                method.setAccessible(true);
                LinearLayoutManager layoutManager = (LinearLayoutManager) method.invoke(okStreamRecyclerView);
                Class llm = layoutManager.getClass().getSuperclass();
                Method m2 = llm.getMethod("scrollToPositionWithOffset",int.class, int.class);
                m2.setAccessible(true);
                m2.invoke(layoutManager,0,0);
            } catch (ClassCastException e){
                log("AN EXECPTON OCCURED WHILE FETCHING VIEW",e);
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }