android-PopupWindow内的ListView问题

我在PopupWindow中有一个ListView. PopupWindow像这样初始化

    window.setContentView(root);
    window.setTouchable(true);
    window.setFocusable(true);
    window.setOutsideTouchable(true);
    window.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);
    window.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);

然后是ListView：

    fileList = (ListView) root.findViewById(R.id.explorer_list);
    fileList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    fileList.setSelector(android.R.drawable.screen_background_light_transparent);
    fileList.setOnItemClickListener(this);

    [...]

    @Override
    public void onItemClick(AdapterView<?> adapter, View v, int pos, long id) {
        selected = (File) fileList.getItemAtPosition(pos);      
    }

像这样,一切正常,除了在滚动ListView之前选择器不会显示在选择器上为止(尽管正确选择了该项目,但在列表滚动之前,视觉上没有显示所选内容).

如果我将PopupWindow设置为不可聚焦,则视觉选择可以正常工作(单击该项目时可以在视觉上选择该项目),但是从不调用onItemClick(),因此无法获得所选项目.

在两种情况下,即使存在选定的项目,ListView.getSelectedItem()始终返回null.

关于如何解决这种情况有什么想法？提前致谢.

解决方法:

我最终使用了一个自定义适配器来存储选定的值,并从那里使用它进行标记：

public class FileExplorerAdapter extends ArrayAdapter<File> {

    /** File names */
    private List<File> values = new ArrayList<File>();

    /** Currently selected position */
    private int selected = -1;

    public FileExplorerAdapter(Context context, List<File> values) {
        super(context, R.layout.explorer_row, values);
        this.values = values;
    }

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

        // I know that my layout is always a TextView
        TextView row = (TextView) convertView;
        if (row == null) {
            row = (TextView) ViewHelper.inflateViewById(getContext(),
                    R.layout.explorer_row);
        }

        // More code...

        // Set up the background for selected element
        if (selected == position) {
            row.setBackgroundColor(Color.LTGRAY);

        // Override background selector
        } else {
            row.setBackgroundColor(Color.TRANSPARENT);
        }

        // More code...

        return row;
    }

    /** This sets the selected position */
    public void setSelected(int position) {
        selected = position;
    }
}

在为关联的ListView实现OnItemClickListener的类上,我在适配器中设置了当前选定的项目.

@Override
public void onItemClick(AdapterView<?> adapter, View v, int pos, long id) {
    FileExplorerAdapter fileadapter = (FileExplorerAdapter) fileList
            .getAdapter();
    fileadapter.setSelected(pos);
}

标签：popupwindow,listview,android
来源： https://codeday.me/bug/20191031/1978641.html