如何让的EditText 接受输入格式为：

How to make EditText accept input in format:

4digit 4digit 4digit 4digit 

我试过Custom格式编辑文本输入的Andr​​oid接受信用卡号码，但不幸的是我无法删除的空间。每当有一个空间，我无法将其删除。请帮我找出这个问题。

I tried Custom format edit text input android to accept credit card number, but unfortunately I was unable to delete the spaces. Whenever there is a space, I could not to delete it. Please help me in finding out the issue.

推荐答案

发现多个答案是OK之后。我走向更加美好的TextWatcher其目的是从正常和独立工作的的TextView 。

After finding multiple answers that are 'OK'. I moved towards a better TextWatcher which is designed to work correctly and independently from the TextView.

TextWatcher类如下：

TextWatcher class is as follows:

/**
 * Formats the watched EditText to a credit card number
 */
public static class FourDigitCardFormatWatcher implements TextWatcher {

    // Change this to what you want... ' ', '-' etc..
    private static final char space = ' ';

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void afterTextChanged(Editable s) {
        // Remove spacing char
        if (s.length() > 0 && (s.length() % 5) == 0) {
            final char c = s.charAt(s.length() - 1);
            if (space == c) {
                s.delete(s.length() - 1, s.length());
            }
        }
        // Insert char where needed.
        if (s.length() > 0 && (s.length() % 5) == 0) {
            char c = s.charAt(s.length() - 1);
            // Only if its a digit where there should be a space we insert a space
            if (Character.isDigit(c) && TextUtils.split(s.toString(), String.valueOf(space)).length <= 3) {
                s.insert(s.length() - 1, String.valueOf(space));
            }
        }
    }
}

然后将其添加到您的TextView，就像任何其他的 TextWatcher 。

{
  //...
  mEditTextCreditCard.addTextChangedListener(new FourDigitCardFormatWatcher()); 
}

这将自动删除空间理智回去，使用户可以真正做到少击键时的编辑。

This will auto delete the space sensibly going back so the user can actually do less keystrokes when editing.

如果您使用的是 inputType =numberDigit这将禁用' - '和''字符，所以我推荐使用 inputType = 手机。这使得其他的字符，而只是使用自定义输入过滤器和问题就解决了​​。

If you are using inputType="numberDigit" this will disable the '-' and ' ' chars, so I recommend using, inputType="phone". This enables other chars, but just use a custom inputfilter and problem solved.