在自动的EditText格式的电话号码 [英] Automatically format phone number in EditText

问题描述

在我的应用程序，用户可以使用以下格式输入在的EditText 字段的电话号码：

In my app, the user has to enter a phone number in an EditText field using the following format:

1（515）555-5555

1(515)555-5555

我不希望用户键入（，），或 - ，而输入号码;我想自动添加这些字符。

I don't want the user to type "(", ")", or "-" while entering the number; I want these characters to be added automatically.

例如，假设键入 1 用户 - 1应该被自动添加后括号，使1（将显示，我会。希望有类似的功能，同时删除。

For example, suppose the user typed 1 -- the parenthesis after "1" should be added automatically, so that "1(" would be displayed. And I would like to have similar functionality while deleting.

我已经尝试设置 onTextWatcher 接口 afterTextChanged 法文本，但它不工作;相反，它是造成错误。任何帮助将大大AP preciated。

I have tried to set text in the afterTextChanged method of onTextWatcher interface, but it is not working; instead it's causing an error. Any help will be greatly appreciated.

推荐答案

您可能正在运行到一个问题，因为 afterTextChanged 是重入，即改变作出文本导致再次调用的方法。

You're probably running into a problem because afterTextChanged is re-entrant, i.e. changes made to the text cause the method to be called again.

如果这就是问题所在，倒过来的一种方法是保持一个实例变量标志：

If that's the problem, one way way around is to keep an instance variable flag:

public class MyTextWatcher implements TextWatcher {
    private boolean isInAfterTextChanged;

    public synchronized void afterTextChanged(Editable text) {
       if (!isInAfterTextChanged) {
           isInAfterTextChanged = true;

           // TODO format code goes here

           isInAfterTextChanged = false;
       }
    }
}

作为替代方案，你可以只使用<一个href=\"http://developer.android.com/reference/android/telephony/PhoneNumberFormattingTextWatcher.html\">PhoneNumberFormattingTextWatcher - 它不这样做，你描述的格式，但话又说回来，你不必做很多工作来使用它。

As an alternative, you could just use PhoneNumberFormattingTextWatcher -- it doesn't do the formatting that you described, but then again you don't have to do much to use it.

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