[移动开发]Android edittext 输入手机号自动添加空格，删除时自动清除空格

StringBuffer phoneNumSpace = new StringBuffer();
et_account.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) {
                showError("");

                phoneNumSpace.setLength(0);
                phoneNumSpace.append(s);
                int length = phoneNumSpace.length();//toString().length();
                //删除数字
                if (count == 0) {
                    if (length == 4) {
                        setContent(phoneNumSpace.deleteCharAt(3));
                    }
                    if (length == 9) {
                        setContent(phoneNumSpace.deleteCharAt(8));
                    }
                }
                //添加数字
                if (count >= 1) {
                    if (length >= 4)
                    {
//                        char[] chars = s.toString().toCharArray();
                        //数字下标是从0开始
                        if (phoneNumSpace.charAt(3) != ' ')
                        {
                            phoneNumSpace.insert(3,' ');
                            setContent(phoneNumSpace);
                        }
                    }
                    if (length >= 9)
                    {
//                        char[] chars = s.toString().toCharArray();
                        //因为第4位加了一个空格，所以第8位数字，就是字符数组的第9位，下标是8。
                        if (phoneNumSpace.charAt(8) != ' ')
                        {
                            phoneNumSpace.insert(8,' ');
                            setContent(phoneNumSpace);
                        }
                    }

//                    if (length == 4) {
//                        String part1 = s.subSequence(0, 3).toString();
//                        String part2 = s.subSequence(3, length).toString();
//                        et_account.setText(part1 + " " + part2);
//                    }
//                    if (length==9){
//
//                        String part1 = s.subSequence(0, 8).toString();
//                        String part2 = s.subSequence(8, length).toString();
//
//                        et_account.setText(part1 + " " + part2);
//                    }
                }




            }

            @Override
            public void afterTextChanged(Editable s) {
               
            }
        });


private void setContent(StringBuffer sb){
        et_account.setText(sb.toString());
        //移动光标到最后面
        et_account.setSelection(sb.length());
    }