Question

我在网格视图上有30张图像（每行3张图像）。如果用户选择第20张图像并转到下一个屏幕然后返回，那么我想要关注该位置。我使用了以下代码行，它适用于前8行，但在最后2行中它不会滚动。请帮忙。

gridview.setSelection(position);
gridview.requestFocusFromTouch();
gridview.setSelection(position);

由于

Answer 1

原因是您的视图将在适配器中重用。

public class ImageAdapter extends BaseAdapter {
    private Context context;
    private final String[] someprivatevariable;

    public ImageAdapter(Context context, String[] mobileValues) {
        // Your boring constructor
    }

    public View getView(int position, View convertView, ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View gridView;

            // REUSE VIEW IF NOT NULL CODE
        if (convertView == null) {
                  .....
                  .....
                  you generally create your view here
        } else {
            gridView = (View) convertView;
        }

        return gridView;
    }
}

如果您的视图被强制不重用，那么您可以通过保存此值来滚动显示

int index = gridview.getFirstVisiblePosition();

并按

恢复该值

gridview.smoothScrollToPosition(int index)

Answer 2

你可以尝试这样的事情。我希望这对你有用..

选择发生时，请保存位置

int index = gridview.getFirstVisiblePosition();

当你回到gridview然后你可以试试这个

gridview.smoothScrollToPosition(int index)

Answer 3

对我有用的解决方案是组合Monali和Sreedev的代码（谢谢Monali和Sreedev）：

private int gridviewVerticalPositionWhenThumbnailTapped;

...

// save vertical position of gridview screen, will use to re-find this location if user follows a usre and gridview gets redrawn
gridviewVerticalPositionWhenThumbnailTapped = gridview.getFirstVisiblePosition();

稍后在app ...

// scroll gridview to vertical position pre user tap follow                
gridview.setSelection(gridviewVerticalPositionWhenThumbnailTapped);

如何将gridview滚动到位置？

3 个答案: