Format TextWatcher android

Question

我的 FourDigitCardFormatWatcher每4个数字添加一个空间。我想将FourDigitCardFormatWatch更改为以下格式55555 5555 555 55。

在5个数字添加一个空间之后，我该如何确定，然后在4位数字添加一个空间后，3位数字添加一个空间。

实际结果：4444 4444 4444

预期结果：44444 4444 444

Answer 1

这样编辑类。

public class FourDigitCardFormatWatcher implements TextWatcher {
// Change this to what you want... ' ', '-' etc..
private final String char = " ";
EditText et_filed;

public FourDigitCardFormatWatcher(EditText et_filed){
    this.et_filed = et_filed;
}
@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) {
    String initial = s.toString();
    // remove all non-digits characters
    String processed = initial.replaceAll("\D", "");
    // insert a space after all groups of 4 digits that are followed by another digit
    processed = processed.replaceAll("(\d{5})(\d{4})(\d{3})(?=\d)(?=\d)(?=\d)", "$1 $2 $3 ");
    //Remove the listener
    et_filed.removeTextChangedListener(this);
    //Assign processed text
    et_filed.setText(processed);
    try {
        et_filed.setSelection(processed.length());
    } catch (Exception e) {
        // TODO: handle exception
    }
    //Give back the listener
    et_filed.addTextChangedListener(this);
}
}

添加侦听器

editText1.addTextChangedListener(new FourDigitCardFormatWatcher(editText1));

Answer 2

更改您的replaceAll语句如下：

processed = processed.replaceAll("(\d{5})(\d{4})(\d{3})(?=\d)*", "$1 $2 $3 ");

这种对我有用的工作，您可能需要更改它以适合您的要求。

应该帮助您，我希望