Android实现EditText正则表达式过滤

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Android实现EditText正则表达式过滤

xEditUtils.set(etUserName, Regular.LETTER_NUMBER, "请输入字母或数字");public static final String LETTER_NUMBER="[a-zA-Z\\d]*";public class XEditUtils {        public void set(final EditText et, final String regular, final String msg) {                et.addTextChangedListener(new TextWatcher() {                        String before = "";                        @Override                        public void onTextChanged(CharSequence s, int start, int before,                                        int count) {                        }                        @Override                        public void beforeTextChanged(CharSequence s, int start, int count,                                        int after) {                                before = s.toString();                        }                        @Override                        public void afterTextChanged(Editable s) {                                if (!s.toString().matches(regular) && !"".equals(s.toString())) {                                        et.setText(before);                                        et.setSelection(et.getText().toString().length());                                        if (msg != null) {                                                Toast.makeText(et.getContext(), msg, Toast.LENGTH_SHORT)                                                                .show();                                        }                                }                        }                });        }}

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