格式TextWatcher android

Question

我的FourDigitCardFormatWatcher在每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位数字后添加空格，然后4位数字后添加空格，3位数后添加空格。

实际结果：4444 4444 4444

预期结果：44444 4444 444

Answer 1

编辑类这样的..

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); 
} 
} 

要添加监听

editText1.addTextChangedListener(new FourDigitCardFormatWatcher(editText1)); 

Answer 2

更改replaceAll声明如下图所示：

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

这种工作对我来说，你可能需要改变它适合您的要求。

这应该对你有所帮助，我希望！