如何禁用onItemSelectedListener设定选定的项目由code时要调用 [英] How to disable onItemSelectedListener to be invoked when setting selected item by code

问题描述

只是想知道你是如何处理以下问题：取决于两个微调所选项目的结果被计算出来。为了处理用户界面的东西，即用户选择在纺纱中的一个新的项目，我安装使用监听器 setOnItemSelectedListener 在微调我的的onCreate （）活动的方法。

Just wondering how you handle the following problem: a result is calculated depending on two spinners' selected items. To handle the UI things, i.e. a user picks a new item in one of the spinners, I install a listener using setOnItemSelectedListener for the spinner in my onCreate() method of the activity.

现在：该作品，当然，罚款。听者的工作是触发结果的一个新的计算。

Now: that works, of course, fine. The listener's work is to trigger a new calculation of the result.

问题：因为我拦截的onPause（） onResume（）保存/恢复过去的状态，我有一个方法，它的设置这两个微调选定的编程就像在这里的项目：

The problem: because I intercept onPause() onResume() to save/restore the last state, I got a method that sets these two spinners' selected item programmatically like in here:

startSpinner.setSelection(pStart);
destSpinner.setSelection(pDest);

这两个电话调用监听器呢！被调用过两次我的计算方法，结果加一个新的结果集的通知！

These two calls invoke the listeners, too! My calculation method for the result plus the notification of a new result set is invoked twice here!

一个愚蠢直接的办法了，这将是有一个布尔变量的禁用无论听众做内部，设置选定的项目，之后重置之前设置它。 好。但是，有没有更好的方法？

A stupid direct approach for this would be to have a boolean variable disabling whatever the listener does inside, setting it before setting the selected items and resetting it afterwards. Okay. But is there a better method??

我不希望听众通过code被称为 - 行动，只能由用户操作！ ： - （

I don't want listeners to be called by code - actions, only by user actions! :-(

你怎么办呢？ 谢谢！

推荐答案

我有一个更简单的，而且我认为，更好的解决方案。因为我甚初始化后刷新纺纱厂，这是一个比较通用的方法。 详情请参阅接受的答案：

I have an easier, and I think, better solution. Since I had to refresh the spinners even after initialization, this is a more generic approach. Please refer the accepted answer:

<一个href="http://stackoverflow.com/questions/21747917/undesired-onitemselected-calls/21751327#21751327">Undesired onItemSelected电话

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