EditText输入手机号中间自动加入空格

实现思路：为EditText设置监听，调用addTextChangedListener(TextWatcher watcher)方法。然后在onTextChanged()方法中处理字符串并显示到EditText上，最后我们要在afterTextChanged(Editable s)方法中将光标移动到最后

下面先熟悉一下TextWatcher 接口回调函数：

public interface TextWatcher extends NoCopySpan {
    /**
     * This method is called to notify you that, within s,
     * the count characters beginning at start
     * are about to be replaced by new text with length after.
     * It is an error to attempt to make changes to s from
     * this callback.
     * 在字符串s内,从索引为start(包含)的字符开始的count个字符将被长度为after的新文    
     * 本代替
     */
    public void beforeTextChanged(CharSequence s, int start,
                                  int count, int after);
    /**
     * This method is called to notify you that, within s,
     * the count characters beginning at start
     * have just replaced old text that had length before.
     * It is an error to attempt to make changes to s from
     * this callback.
     * 在字符串s内,从索引为start(包含)的字符开始count个字符刚刚替换了长度为before的
     * 旧字符
     */
    public void onTextChanged(CharSequence s, int start, int before, int count);

    /**
     * This method is called to notify you that, somewhere within
     * s, the text has been changed.
     * It is legitimate to make further changes to s from
     * this callback, but be careful not to get yourself into an infinite
     * loop, because any changes you make will cause this method to be
     * called again recursively.
     * (You are not told where the change took place because other
     * afterTextChanged() methods may already have made other changes
     * and invalidated the offsets.  But if you need to know here,
     * you can use {@link Spannable#setSpan} in {@link #onTextChanged}
     * to mark your place and then look up from here where the span
     * ended up.
     * 字符串s内容已经发生了变化.可以在这一步对s进行合理的变更,但是要注意不要进入
     * 无限循环,因为字符串的任何变化都会再次递归调用此回调方法.在这个方法中不会告
     * 诉 你字符串哪些内容发生了变化,因为其他针对字符串的改变已经调用了
     * afterTextChanged().如果你想知道哪些发生了变化,可以在
     * onTextChanged(CharSequence, int, int, int)使用setSpan(Object, int, int, int)做标记
     */
    public void afterTextChanged(Editable s);
}

实现代码如下：

注意，手机号码为11位，但是因为有特殊字符（代码中将空格替换为想要的字符）或者空格，所以EditText的 android:maxLength="13" 属性要设置为大于11，我的由于存在两个空格，所以设置最大为13。

        android:hint="请输入手机号"
        android:inputType="phone|number"
        android:maxLength="13" />

 etPhone.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                int length = s.toString().length();
               //删除数字
                if (count == 0) {
                    if (length == 4) {
                        etPhone.setText(s.subSequence(0, 3));
                    }
                    if (length == 9) {
                        etPhone.setText(s.subSequence(0, 8));
                    }
                }
                //添加数字
                if (count == 1) {
                    if (length == 4) {
                        String part1 = s.subSequence(0, 3).toString();
                        String part2 = s.subSequence(3, length).toString();
                        etPhone.setText(part1 + " " + part2);
                    }
                    if (length==9){
                        String part1 = s.subSequence(0, 8).toString();
                        String part2 = s.subSequence(8, length).toString();
                        etPhone.setText(part1 + " " + part2);
                    }
                }
            }
            @Override
            public void afterTextChanged(Editable s) {
               //将光标移动到末尾
                etPhone.setSelection(etPhone.getText().toString().length());
              //处理s
        });

代码很简单，下面看看效果图：

edit_text.png

虽然效果做出来了，但是当我们调用etPhone.getText().toString()方法时，你会发现得到的结果里也是包含空格或者特殊字符的一串号码。如果想要纯数字的结果，那么就需要对结果进行一下处理：

//从EditText获取的字符串
 String phoneNum=etPhone.getText().toString();
//纯数字字符串
String number=formatPhoneNum(phoneNum);
 /**
     * 去掉手机号内除数字外的所有字符
     *
     * @param phoneNum 手机号
     * @return
     */
    private String formatPhoneNum(String phoneNum) {
        String regex = "(\\+86)|[^0-9]";
        Pattern pattern = Pattern.compile(regex );
        Matcher matcher = pattern.matcher(phoneNum);
        return matcher.replaceAll("");
    }