Android中自定义RecyclerView使之可以在低版本上实现高版本同样的局部加载局部刷新功能 请写出代码

好的，以下是代码实现。

public class CustomRecyclerView extends RecyclerView {

    public CustomRecyclerView(Context context) {
        super(context);
        init();
    }

    public CustomRecyclerView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CustomRecyclerView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        // 初始化LayoutManager以及ItemAnimator
        LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        setLayoutManager(layoutManager);
        setItemAnimator(new DefaultItemAnimator());
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            // 低版本设备，需要禁用ItemAnimator
            try {
                Field itemAnimatorField = RecyclerView.class.getDeclaredField("mItemAnimator");
                itemAnimatorField.setAccessible(true);
                itemAnimatorField.set(this, null);
            } catch (NoSuchFieldException | IllegalAccessException e) {
                e.printStackTrace();
            }
            // 设置LayoutManager的RecyclerView为当前自定义RecyclerView
            getLayoutManager().setRecyclerView(this);
        }
    }

    @Override
    public void smoothScrollToPosition(int position) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            // 低版本设备，直接调用父类方法
            super.smoothScrollToPosition(position);
        } else {
            try {
                // 高版本设备，通过反射获取LayoutManager的mLayout成员变量并调用其scrollToPosition方法实现平滑滚动
                Field layoutField = RecyclerView.class.getDeclaredField("mLayout");
                layoutField.setAccessible(true);
                Object layout = layoutField.get(this);
                Class<?> layoutClass = layout.getClass();
                Method scrollToPositionMethod = layoutClass.getDeclaredMethod("scrollToPosition", int.class);
                scrollToPositionMethod.invoke(layout, position);
            } catch (NoSuchFieldException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void scrollToPosition(int position) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            // 低版本设备，直接调用父类方法
            super.scrollToPosition(position);
        } else {
            try {
                // 高版本设备，通过反射获取LayoutManager的mLayout成员变量并调用其scrollToPosition方法实现滚动到指定位置
                Field layoutField = RecyclerView.class.getDeclaredField("mLayout");
                layoutField.setAccessible(true);
                Object layout = layoutField.get(this);
                Class<?> layoutClass = layout.getClass();
                Method scrollToPositionMethod = layoutClass.getDeclaredMethod("scrollToPosition", int.class);
                scrollToPositionMethod.invoke(layout, position);
            } catch (NoSuchFieldException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
                e.printStackTrace();
            }
        }
    }
}

注意，需要在布局文件中使用自定义的RecyclerView，例如：

<com.example.CustomRecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />