Android 过滤特殊字符和emoji表情

网上有很多屏蔽特殊字符和表情的例子，用起来也很简单，比如：

   //判断搜索框内容是否包含特殊字符
                String limitEx = "[`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~！@①#￥%……&*（）——+|{}【】‘；：”“’。，、？]";

                Pattern pattern = Pattern.compile(limitEx);
                Matcher m = pattern.matcher(str);

                if (m.find()) {
                    ToastUtil.show("不能输入特殊字符");
                    return groupList;
                }

一般都是利用正则来判断，但是特殊字符和表情特别多 要将这些特殊字符都用正则来判断会显得多而臃肿。

在Activirty中调用：
et.addTextChangedListener(textWatcher);
        setProhibitEmoji(et);
后来在项目中看到了我们经理写的顿时觉得高大上啊  
于是赶紧整理下收藏起来方便以后再用，虽然不是很明白原理，但是用起来很方便直接放进项目里调用就可以了
  public  void setProhibitEmoji(EditText et) {
        InputFilter[] filters = { getInputFilterProhibitEmoji() ,getInputFilterProhibitSP()};
        et.setFilters(filters);
    }

    public  InputFilter getInputFilterProhibitEmoji() {
        InputFilter filter = new InputFilter() {
            @Override
            public CharSequence filter(CharSequence source, int start, int end,
                                       Spanned dest, int dstart, int dend) {
                StringBuffer buffer = new StringBuffer();
                for (int i = start; i < end; i++) {
                    char codePoint = source.charAt(i);
                    if (!getIsEmoji(codePoint)) {
                        buffer.append(codePoint);
                    } else {
                        ToastUtil.show("群组昵称不能含有第三方表情");
                        i++;
                        continue;
                    }
                }
                if (source instanceof Spanned) {
                    SpannableString sp = new SpannableString(buffer);
                    TextUtils.copySpansFrom((Spanned) source, start, end, null,
                            sp, 0);
                    return sp;
                } else {
                    return buffer;
                }
            }
        };
        return filter;
    }


    public  boolean getIsEmoji(char codePoint) {
        if ((codePoint == 0x0) || (codePoint == 0x9) || (codePoint == 0xA)
                || (codePoint == 0xD)
                || ((codePoint >= 0x20) && (codePoint <= 0xD7FF))
                || ((codePoint >= 0xE000) && (codePoint <= 0xFFFD))
                || ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF)))
            return false;
        return true;
    }


    public  InputFilter getInputFilterProhibitSP() {
        InputFilter filter = new InputFilter() {
            @Override
            public CharSequence filter(CharSequence source, int start, int end,
                                       Spanned dest, int dstart, int dend) {
                StringBuffer buffer = new StringBuffer();
                for (int i = start; i < end; i++) {
                    char codePoint = source.charAt(i);
                    if (!getIsSP(codePoint)) {
                        buffer.append(codePoint);
                    } else {
                        ToastUtil.show("群组昵称不能含有特殊字符");
                        i++;
                        continue;
                    }
                }
                if (source instanceof Spanned) {
                    SpannableString sp = new SpannableString(buffer);
                    TextUtils.copySpansFrom((Spanned) source, start, end, null,
                            sp, 0);
                    return sp;
                } else {
                    return buffer;
                }
            }
        };
        return filter;
    }


在Anctivity中调用：