仅使用XML的焦点变化更新Android EditText上的提示 [英] Updating Android EditText's hint on focus change using XML only

问题描述

我饶有兴趣地阅读用户苏尼特的答案的有关更新一个EditText的提示但一直未能找到关于使用我presume他似乎来形容那里的方法的任何文档这样的问题：使用＆LT;选择＆gt;在元素集中/聚焦在运行时在XML布局元素进行动态调整的的EditText 属性。

I read with interest user sunit's answer to this question about updating an EditText's hint but have been unable to find any documentation on using the method that I presume he appears to describe there: using the <selector> element in an XML layout to dynamically adjust attributes of an EditText at runtime when the element is focused/unfocused.

在我的情况下，我其实更感兴趣的是调整的android：inputType下元素（因为提示我消失时指定inputType下），但调整的提示会工作一样好。

In my case I am actually more interested in adjusting the android:inputType element (because the hint disappears for me when the inputType is specified) but adjusting the hint would work just as well.

要明确，我知道如何在Java中code这种变化 - 我试图找出是否有指定XML中的行为方式。谢谢！

To be clear I know how to make this change in Java code--I'm trying to find out if there is a way to specify the behavior in XML. Thanks!

推荐答案

我恐怕是没有可能的。 ＆LT;选择方式＆gt; 是唯一有效的做出州罗列出可绘制和颜色的资源得到应用，它还不弦乐工作

I'm afraid it isn't yet possible. <selector> is only valid to be applied in making state lists out of Drawable and Color resources, it does not yet work for Strings.

至于您的调整提的android：inputType下后，提示消失，这其实是一个已知的Andr​​oid bug，它最终会被固定在以后的版本，所以我不会T建议建立你的code解决此功能时，他们修复它会打破：

With regards to your mention of adjusting android:inputType to make the hint disappear, this is actually a known Android bug that will eventually be fixed in later versions so I wouldn't recommend building your code around this functionality as it will break when they fix it:

HTTP：//$c$c.google。 COM / p /安卓/问题/细节？ID = 13895

既然你提到你已经知道如何在Java code做到这一点，我不会指出如何从调用 setHint（）中的一个 OnFocusChangeListener ;）

Since you mentioned that you already know how to do this in the Java code, I won't point out how to call setHint() from within a OnFocusChangeListener ;)

干杯。

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