2 ssummeraw ssummeraw 于 2013.03.25 13:19 提问

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?

3个回答

curie_87
curie_87   2013.03.26 15:54
已采纳

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"
/>
franzhong
franzhong   2013.03.25 20:31

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
             }
            }......
u014540181
u014540181   2016.12.02 14:07

android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-" 中间不需要逗号的 写成这样就可以了的 android:digits="0123456789*qwertzuiopasdfghjklyxcvbnm_-"

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