如何在 Android 中限制 Spinner 下拉视图的高度 [英] How to limit the height of Spinner drop down view in Android

问题描述

请建议我用来创建它的任何方法.

查询:我正在创建 2-Spinner 视图，我必须在其中添加国家/城市列表，所以就像我选择印度然后我在下拉视图中得到 50 个项目一样，问题这是因为它占用了整个页面的高度.

Query : I am creating 2-Spinner view , where i have to add Country/Cities list , So like if i am selecting india then i am getting 50 items inside the drop down view , problem with this is that it is taking the whole page in height .

我想要的:我想创建一个下拉视图，用户只能在其中看到 10 个项目下拉视图，只要用户滚动下拉视图，就会显示其他项目.

What i want : I want to create a drop down view , where user can see only 10 items in the drop down view , other items will be shown whenever user will scroll the drop down view .

推荐答案

您可以使用反射.

    Spinner spinner = (Spinner) findViewById(R.id.spinner);
    try {
        Field popup = Spinner.class.getDeclaredField("mPopup");
        popup.setAccessible(true);

        // Get private mPopup member variable and try cast to ListPopupWindow
        android.widget.ListPopupWindow popupWindow = (android.widget.ListPopupWindow) popup.get(spinner);

        // Set popupWindow height to 500px
        popupWindow.setHeight(500);
    }
    catch (NoClassDefFoundError | ClassCastException | NoSuchFieldException | IllegalAccessException e) {
        // silently fail...
    }

这篇关于如何在 Android 中限制 Spinner 下拉视图的高度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！