Android过滤特殊字符和emoji表情

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/xiogjie_67/article/details/79583726

1.需求场景

    现在一些输入法自带emoji表情，EditText是支持该字符输入的，而对于业务来说，输入这些字符又是不合法的，因此需要对这些字符进行过滤，在用户输入时即时给出提示信息。

2.解决方法

    为EditText添加输入过滤器.

    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(ApplicationContext.getString(R.string
                                .installment_contact_detail_address_face_tip));
                        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(ApplicationContext.getString(R.string
                                .installment_contact_detail_address_error_tip));
                        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 getIsSp(char codePoint){
        if(Character.getType(codePoint)>Character.LETTER_NUMBER){
            return true;
        }
        return false;
    }

调用方法：

InputFilter[] filters ={getInputFilterProhibitEmoji(),getInputFilterProhibitSP()};
        et_contact_detail_address.setFilters(filters);