mTitleEt.setFilters(new InputFilter[]{FilterUtil.getInputFilter(context,
        getString(R.string.filter_default), FilterUtil.MATCHER_DEFAULT),new InputFilter.LengthFilter(50)});

其中FilterUtil.getInputFilter是工具類

public class FilterUtil {
    //過濾表情正則表示式
    public static final String EMOJI = "[\ud83c\udc00
 
-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]";
    //匹配暱稱
    public static final String MATCHER_NICKNAME = "[A-Za-z0-9_\\-\\u4e00-\\u9fa5]+";

    //匹配數字、中英文、標點符號
    public static final String MATCHER_DEFAULT = "[A-Za-z0-9_\\-\\u4e00-\\u9fa5\\p{P}]+";

    //過濾金額
    public static final String MATCHER_MONEY 
 
= "(^[1-9]\\d*(\\.\\d{1,2})?$)|(^[0]{1}(\\.\\d{1,2})?$)";

    //匹配中文字元
    public static final String MATCHER_CN = "[\\u4e00-\\u9fa5]";

    /**
     *
     * @param context
     * @return 返回EditText輸入文字過濾器
     */
    public static InputFilter getInputFilter(final Context context,final String toast,final 
 
String regex){
        InputFilter inputFilter = new InputFilter() {
            @Override
            public CharSequence filter(CharSequence charSequence, int start, int end, Spanned dest, int dstart, int dend) {
                if(charSequence.length()>0){
                    if(isMatcher(charSequence.toString(),regex)){
                        return null;
                    }else{
                        Toast.makeText(context,toast,0).show();
                        return "";
                    }
                }
                return null;
            }
        };
        return inputFilter;
    }

    /**
     * 正則表示式匹配
     * @param content 待匹配內容
     * @param regex   正則表示式
     * @return true 匹配成功
     */
    public static boolean isMatcher(String content,String regex){
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(content);
        return matcher.find();
    }
}