用于多个 EditText 的 TextWatcher
我想为多个 EditText 字段实现 TextWatcher 接口。目前我正在使用 :
text1.addTextChangedListener(this);
text2.addTextChangedListener(this);
then 覆盖我的 Activity 中的方法：
public void afterTextChanged(Editable s) {}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count)
{
// do some operation on text of text1 field
// do some operation on text of text2 field
}
但是这工作正常，但我正在寻找其他方法，以便我可以明确识别 EditText 字段中的 SoftKeyboard< /code> 当前处于焦点状态。
I want to implement the TextWatcher interface for more than one EditText fields. Currently I am using :
text1.addTextChangedListener(this);
text2.addTextChangedListener(this);
then overriding the methods in my Activity:
public void afterTextChanged(Editable s) {}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count)
{
// do some operation on text of text1 field
// do some operation on text of text2 field
}
However this is working fine but I'm looking for other ways so that I can explicitly identify that in which EditText field the SoftKeyboard is currently focused.
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评论（17）
@Sebastian Roth 的回答中建议的解决方案不是某些
EditText 的。对于 n 个TextWatcher实例EditText，它是一个类和该类的 n 个实例。每个 EditText 都有自己的 Spannable。
TextWatcher的事件将此 Spannable 作为s参数。我检查它们的 hashCode（每个对象的唯一 ID）。 myEditText1.getText() 返回 Spannable。因此，如果myEditText1.getText().hashCode()等于s.hashCode()则意味着s属于myEditText1因此，如果您想为某些
EditTexts拥有一个TextWatcher实例，您应该使用以下命令：
Suggested solution in @Sebastian Roth's answer is not one instance of
TextWatcherfor someEditTexts. It is one class and n instances of that class for nEditTexts.Each EditText has its own Spannable.
TextWatcher's events has this Spannable assparameter. I check their hashCode (unique Id of each object). myEditText1.getText() returns that Spannable. So if themyEditText1.getText().hashCode()equals withs.hashCode()it means thatsbelongs tomyEditText1So if you want to have one instance of
TextWatcherfor someEditTextsyou should use this:and
我会这样做：
I would do it like this:
我使用这个解决方案：
添加返回侦听器的方法：
为多个EditText添加监听器，也可以传递其他参数：
I use this solution:
Add method that returns listener:
Add listener to multiple EditText's, you can also pass other parameters:
使用“CustomTextWatcher”的想法，我做到了
1）创建了一个新的TextWatcherListener接口：
2）创建并使用EditTextExtended而不是EditText（在我的例子中）：
3）所以，你需要编写此代码的地方：
4）使用它们：
嗯，让我知道你的想法。
using "CustomTextWatcher" idea, I done that
1) Crated a new TextWatcherListener interface:
2)Created and used EditTextExtended instead of EditText (in my case):
3) So, where you need write this code:
4)use them:
Well, let me know what do you think.
--EDIT--
如果您只想使用 afterTextChanged 比较可编辑内容：
--EDIT--
If you want to use only afterTextChanged compare editables:
我将其实现为：
和：
I implemented it as:
and:
另一种方法是将
OnClickListener添加到EditText并设置一个全局变量，如下所示使用此 etCurrentEditor 作为对当前编辑的 EditText 的引用
One more way around is to add
OnClickListenertoEditTextand set a global variable as given belowUse this etCurrentEditor as a reference to currently edited EditText
在尝试了多种方法来实现这一目标之后，我找到了使用
EditText.isFocused()区分彼此的正确方法。例如：After try several ways to achieve this, i find the right way using
EditText.isFocused()to distinguish one to another. For example:是的，您可以使用存储
TextView的自定义TextWatcher的多个实例。（
TextView实际上是具有addTextChangedListener的类。）与上面的 hashCode 解决方案类似，您只需检查是否
getText()==s即可。您无需多次存储所有控件或
findViewById，只需自行扫描一次内容树即可查找具有CharSequence的控件。当然，您也可以在
beforeTextChanged和onTextChanged中使用findTextView。Yes, you could use multiple instances of a custom
TextWatcherthat store theTextView.(
TextViewis actually the class that hasaddTextChangedListener.)Similar to the hashCode solution above you can just check if
getText()==s.Instead of either storing all your controls or
findViewByIdmultiple times, you could simply scan the content tree yourself once for the control that has theCharSequence.Of course you could also use
findTextViewinsidebeforeTextChangedandonTextChanged.所有活动的全球一类。
CustomTextWatcher.java
Global One class for all the activities.
CustomTextWatcher.java
您可以执行此操作来获取编辑文本的 ID。它尚未经过测试，但请告诉我它是否有效。
You can do this for getting the id of the edit texts. It's not tested but let me know if it works.
您始终可以将
TextWatcher定义为addTextChangedListener方法的参数。这样您就可以为每个编辑文本拥有多个定义。You can always define
TextWatcheras a parameter toaddTextChangedListenermethod.This way you can have multiple definitions for each edit text.只需使用 hashCode() 方法比较 edittext 和字符串的哈希码
just compare hash codes of the edittext and string like by using hashCode() method
这就是我所做的...
然后只需将 TextWatcher 添加到 onCreate 方法中的每个 EditText 中即可这里还默认保留了按钮 setEnabled(false) 。
This is what I have done...
Then just added the TextWatcher to each EditText in the onCreate method & also kept the button setEnabled(false) by default here.
如果您使用 Kotlin，扩展函数就可以完成这项工作。
例如，我们需要将 TextWatcher 添加到
editText1和editText2创建一个这样的扩展函数，
然后将 textwatcher 添加到 EditTexts 中，如下所示
If you are using Kotlin, extension function will do the job.
For example, we need to add TextWatcher to
editText1andeditText2Create a extension function like this,
Then just add the textwatcher to EditTexts like this
我做了这样的事情，只有一个
TextWatcher类来控制来自Activity或Fragment的尽可能多的EditText>您需要首先创建一个
MultiTextWatcher类，如下所示，然后在您的
Activity或Fragment中，您需要注册尽可能多的EditText< /code> 如您所愿，如下所示，而且我还使用了 数据绑定 获取XML视图的引用，您可以使用您的方式。I've done something like this to have only one
TextWatcherclass to control as manyEditTexteither fromActivityORFragmentYou need to first create a
MultiTextWatcherclass as belowThen in your
ActivityorFragment, you need to register as manyEditTextas you want like below, and also I've used Data Binding to get references of theXMLviews and you can use your ways.使用 ：
using :