在Android的下拉收盘在微调 [英] Closing dropdown in Spinner in Android

问题描述

我需要动画箭头的图标打开和Android中关闭微调时。
我可以在打开时微调旋转箭头：我只是把一个 setOnTouchListener 在微调

I need to animate an icon of an arrow when opening and closing a spinner in Android. I can rotate the arrow when opening the spinner: I just put a setOnTouchListener on the Spinner.

问题来了，当下拉关闭，或隐藏，因为我不知道如何设置一个监听器或类似的东西在该操作。

The problem comes, when the dropdown is closed, or hidden, because I don't know how to set a listener or something like that on that action.

任何人有关于如何做到这一点的想法，如果可能的话？

Anybody has an idea about how to do this, if possible?

非常感谢在前进。

推荐答案

我不知道为什么谷歌不能做了这么久，但你能解决这个问题是这样的：

I do not know why Google can not do it for so long, but you can solve the problem this way:

您必须重写保护法onDetachedFromWindow的微调，使其作为公共方法，并通过单击该项目在CustomSpinnerAdapter唤起它。

You must override the protected method "onDetachedFromWindow" for Spinner, make it as public method, and calling forth it by clicking on the item in your CustomSpinnerAdapter.

例如：

    public class CustomSpinner extends Spinner
    {
        Context context = null;

        public CustomSpinner(Context context)
        {
            super(context);
        }

        public CustomSpinner(Context context, int mode)
        {
            super(context, mode);
        }

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

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

        public CustomSpinner(Context context, AttributeSet attrs, int defStyle, int mode)
        {
            super(context, attrs, defStyle, mode);
        }

        @Override public void onDetachedFromWindow()
        {
            super.onDetachedFromWindow();
        }
    }

我希望你知道如何创建SpinnerCustomAdapter和XML插入此CustomSpinner。

I hope you know how to create SpinnerCustomAdapter and insert this CustomSpinner in xml.

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