java - 格式化TextWatcher android

我的FourDigitCardFormatWatcher每4个数字后面加一个空格。我想将FourDigitCardFormatWatch更改为以下格式55555 5555 555 55。

如何确定5个数字后加一个空格，然后在4个数字后加一个空格，然后在3个数字后加一个空格。

实际结果：4444 4444 4444

预期结果：44444 4444 444

最佳答案

像这样编辑课程。

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);
}
}

添加监听器

editText1.addTextChangedListener(new FourDigitCardFormatWatcher(editText1));