问题描述

Edittext 验证只允许输入数字和字符？

在程序中 edittext 验证，应该只允许输入字符、数字、下划线和连字符。

edittext.addTextChangedListener(new TextWatcher() {

                        @Override
                        public void onTextChanged(CharSequence s, int start, int before, int count) {
                            // TODO Auto-generated method stub

                            }

                        @Override
                        public void beforeTextChanged(CharSequence s, int start, int count,
                        int after) {
                                            // TODO Auto-generated method stub

                            }

                                        @Override
                            public void afterTextChanged(Editable s) {
                                            // validation codes here

                            location_name=s.toString();
                            Toast.makeText(getApplicationContext(),location_name, Toast.LENGTH_SHORT).show();                

                            if (location_name.matches(".*[^a-z^0-9].*"))
                                {
                            location_name = location_name.replaceAll("[^a-z^0-9]", "");
                            s.append(location_name);
                            s.clear();
                            Toast.makeText(getApplicationContext(),"Only lowercase letters and numbers are allowed!",Toast.LENGTH_SHORT).show();

                            }

                            }

                        });     

location.add(location_name);

当我在edittext中输入信息时，程序被强行关闭了。什么地方出错呢？

解决方案

不要使用 "manual"方法，下面这个方法很简单：

InputFilter filter = new InputFilter() {
    public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
            for (int i = start; i < end; i++) {
                    if ( !Character.isLetterOrDigit(source.charAt(i)) || !Character.toString(source.charAt(i)) .equals("_") || !Character.toString(source.charAt(i)) .equals("-")) {
                            return "";
                    }
            }
            return null;
    }
};
edit.setFilters(new InputFilter[]{filter});

或者另一个方法：在 xml 中设置创建 EditText 允许的字符

<EditText
  android:inputType="text"
  android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-"
  android:hint="Only letters, digits, _ and - allowed"
/>

解决方案二：

你放错地也改错值了，给你个参考的

     final EditText   et = (EditText) this.findViewById(R.id.myEdit);
     et.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub
             String location_name=s.toString();
             if (location_name.matches("^[A-Za-z0-9 _-]+$")){
                Toast.makeText(getApplicationContext(),"类型正确!",Toast.LENGTH_SHORT).show();
             }else{
                Toast.makeText(getApplicationContext(),"类型不符!",Toast.LENGTH_SHORT).show();
                et.setText("AAA");//change here
             }
            }......