Android 准确过滤(禁止) Emoji表情

emoji过滤正则

参考emoji-regex的正则分类为3种标准 RGI标准 、旧标准 、旧标准+文字类型 。
但是这里 文字类型(无彩色Icon) 的emoji 把 #*0-9 也算在内并不正确。

Android过滤输入API

1) InputFilter

import android.text.InputFilter
import android.text.Spanned
import androidx.annotation.IntDef
import java.util.regex.Pattern

class EmojiFilter(
        @Type type: Int = Type.RGI,
) : InputFilter {

    val pattern by lazy {
        when (type) {
            Type.RGI -> patternRGI
            Type.OLD -> patternOld
            Type.TEXT -> patternText
            else -> patternRGI
        }
    }

    override fun filter(source: CharSequence, start: Int, end: Int, dest: Spanned, dstart: Int, dend: Int): CharSequence? {
        return pattern.matcher(source).replaceAll("")
    }

    companion object {
        // RGI标准
        val emojiRegexRGI = """\x{1F3F4}\x{E0067}\x{E0062}(?:\x{E0077}\x{E006C}\x{E0073}|\x{E0073}\x{E0063}\x{E0074}|\x{E0065}\x{E006E}\x{E0067})\x{E007F}|(?:\x{1F9D1}\x{1F3FF}\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D)?\x{1F9D1}|\x{1F469}\x{1F3FF}\u200D\x{1F91D}\u200D[\x{1F468}\x{1F469}])[\x{1F3FB}-\x{1F3FE}]|(?:\x{1F9D1}\x{1F3FE}\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D)?\x{1F9D1}|\x{1F469}\x{1F3FE}\u200D\x{1F91D}\u200D[\x{1F468}\x{1F469}])[\x{1F3FB}-\x{1F3FD}\x{1F3FF}]|(?:\x{1F9D1}\x{1F3FD}\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D)?\x{1F9D1}|\x{1F469}\x{1F3FD}\u200D\x{1F91D}\u200D[\x{1F468}\x{1F469}])[\x{1F3FB}\x{1F3FC}\x{1F3FE}\x{1F3FF}]|(?:\x{1F9D1}\x{1F3FC}\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D)?\x{1F9D1}|\x{1F469}\x{1F3FC}\u200D\x{1F91D}\u200D[\x{1F468}\x{1F469}])[\x{1F3FB}\x{1F3FD}-\x{1F3FF}]|(?:\x{1F9D1}\x{1F3FB}\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D)?\x{1F9D1}|\x{1F469}\x{1F3FB}\u200D\x{1F91D}\u200D[\x{1F468}\x{1F469}])[\x{1F3FC}-\x{1F3FF}]|\x{1F468}(?:\x{1F3FB}(?:\u200D(?:\u2764\uFE0F\u200D(?:\x{1F48B}\u200D\x{1F468}[\x{1F3FB}-\x{1F3FF}]|\x{1F468}[\x{1F3FB}-\x{1F3FF}])|\x{1F91D}\u200D\x{1F468}[\x{1F3FC}-\x{1F3FF}]|[\u2695\u2696\u2708]\uFE0F|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}]))?|[\x{1F3FC}-\x{1F3FF}]\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D\x{1F468}[\x{1F3FB}-\x{1F3FF}]|\x{1F468}[\x{1F3FB}-\x{1F3FF}])|\u200D(?:\u2764\uFE0F\u200D(?:\x{1F48B}\u200D)?\x{1F468}|[\x{1F468}\x{1F469}]\u200D(?:\x{1F466}\u200D\x{1F466}|\x{1F467}\u200D[\x{1F466}\x{1F467}])|\x{1F466}\u200D\x{1F466}|\x{1F467}\u200D[\x{1F466}\x{1F467}]|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|\x{1F3FF}\u200D(?:\x{1F91D}\u200D\x{1F468}[\x{1F3FB}-\x{1F3FE}]|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|\x{1F3FE}\u200D(?:\x{1F91D}\u200D\x{1F468}[\x{1F3FB}-\x{1F3FD}\x{1F3FF}]|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|\x{1F3FD}\u200D(?:\x{1F91D}\u200D\x{1F468}[\x{1F3FB}\x{1F3FC}\x{1F3FE}\x{1F3FF}]|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|\x{1F3FC}\u200D(?:\x{1F91D}\u200D\x{1F468}[\x{1F3FB}\x{1F3FD}-\x{1F3FF}]|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|(?:\x{1F3FF}\u200D[\u2695\u2696\u2708]|\x{1F3FE}\u200D[\u2695\u2696\u2708]|\x{1F3FD}\u200D[\u2695\u2696\u2708]|\x{1F3FC}\u200D[\u2695\u2696\u2708]|\u200D[\u2695\u2696\u2708])\uFE0F|\u200D(?:[\x{1F468}\x{1F469}]\u200D[\x{1F466}\x{1F467}]|[\x{1F466}\x{1F467}])|\x{1F3FF}|\x{1F3FE}|\x{1F3FD}|\x{1F3FC})?|(?:\x{1F469}(?:\x{1F3FB}\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D[\x{1F468}\x{1F469}]|[\x{1F468}\x{1F469}])|[\x{1F3FC}-\x{1F3FF}]\u200D\u2764\uFE0F\u200D(?:\x{1F48B}\u200D[\x{1F468}\x{1F469}]|[\x{1F468}\x{1F469}]))|\x{1F9D1}[\x{1F3FB}-\x{1F3FF}]\u200D\x{1F91D}\u200D\x{1F9D1})[\x{1F3FB}-\x{1F3FF}]|\x{1F469}\u200D\x{1F469}\u200D(?:\x{1F466}\u200D\x{1F466}|\x{1F467}\u200D[\x{1F466}\x{1F467}])|\x{1F469}(?:\u200D(?:\u2764\uFE0F\u200D(?:\x{1F48B}\u200D[\x{1F468}\x{1F469}]|[\x{1F468}\x{1F469}])|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|\x{1F3FF}\u200D[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}]|\x{1F3FE}\u200D[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}]|\x{1F3FD}\u200D[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}]|\x{1F3FC}\u200D[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}]|\x{1F3FB}\u200D[\x{1F33E}\x{1F373}\x{1F37C}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|\x{1F9D1}(?:\u200D(?:\x{1F91D}\u200D\x{1F9D1}|[\x{1F33E}\x{1F373}\x{1F37C}\x{1F384}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1F52C}\x{1F680}\x{1F692}\x{1F9AF}-\x{1F9B3}\x{1F9BC}\x{1F9BD}])|\x{1F3FF}\u200D[\x{1F33E}\x{1F373}\x{1F37C}\x{1F384}\x{1F393}\x{1F3A4}\x{1F3A8}\x{1F3EB}\x{1F3ED}\x{1F4BB}\x{1F4BC}\x{1F527}\x{1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        val patternRGI by lazy { Pattern.compile(emojiRegexRGI, Pattern.UNICODE_CASE or Pattern.CASE_INSENSITIVE) }

        // 旧标准
        val emojiRegexOld = """\u231A\u231B\u23E9-\u23EC\u23F0\u23F3\u25FD\u25FE\u2614\u2615\u2648-\u2653\u267F\u2693\u26A1\u26AA\u26AB\u26BD\u26BE\u26C4\u26C5\u26CE\u26D4\u26EA\u26F2\u26F3\u26F5\u26FA\u26FD\u2705\u270A\u270B\u2728\u274C\u274E\u2753-\u2755\u2757\u2795-\u2797\u27B0\u27BF\u2B1B\u2B1C\u2B50\u2B55\x{1F004}\x{1F0CF}\x{1F18E}\x{1F191}-\x{1F19A}\x{1F1E6}-\x{1F1FF}\x{1F201}\x{1F21A}\x{1F22F}\x{1F232}-\x{1F236}\x{1F238}-\x{1F23A}\x{1F250}\x{1F251}\x{1F300}-\x{1F320}\x{1F32D}-\x{1F335}\x{1F337}-\x{1F37C}\x{1F37E}-\x{1F393}\x{1F3A0}-\x{1F3CA}\x{1F3CF}-\x{1F3D3}\x{1F3E0}-\x{1F3F0}\x{1F3F4}\x{1F3F8}-\x{1F43E}\x{1F440}\x{1F442}-\x{1F4FC}\x{1F4FF}-\x{1F53D}\x{1F54B}-\x{1F54E}\x{1F550}-\x{1F567}\x{1F57A}\x{1F595}\x{1F596}\x{1F5A4}\x{1F5FB}-\x{1F64F}\x{1F680}-\x{1F6C5}\x{1F6CC}\x{1F6D0}-\x{1F6D2}\x{1F6D5}-\x{1F6D7}\x{1F6EB}\x{1F6EC}\x{1F6F4}-\x{1F6FC}\x{1F7E0}-\x{1F7EB}\x{1F90C}-\x{1F93A}\x{1F93C}-\x{1F945}\x{1F947}-\x{1F978}\x{1F97A}-\x{1F9CB}\x{1F9CD}-\x{1F9FF}\x{1FA70}-\x{1FA74}\x{1FA78}-\x{1FA7A}\x{1FA80}-\x{1FA86}\x{1FA90}-\x{1FAA8}\x{1FAB0}-\x{1FAB6}\x{1FAC0}-\x{1FAC2}\x{1FAD0}-\x{1FAD6}]|[#\*0-9\xA9\xAE\u203C\u2049\u2122\u2139\u2194-\u2199\u21A9\u21AA\u231A\u231B\u2328\u23CF\u23E9-\u23F3\u23F8-\u23FA\u24C2\u25AA\u25AB\u25B6\u25C0\u25FB-\u25FE\u2600-\u2604\u260E\u2611\u2614\u2615\u2618\u261D\u2620\u2622\u2623\u2626\u262A\u262E\u262F\u2638-\u263A\u2640\u2642\u2648-\u2653\u265F\u2660\u2663\u2665\u2666\u2668\u267B\u267E\u267F\u2692-\u2697\u2699\u269B\u269C\u26A0\u26A1\u26A7\u26AA\u26AB\u26B0\u26B1\u26BD\u26BE\u26C4\u26C5\u26C8\u26CE\u26CF\u26D1\u26D3\u26D4\u26E9\u26EA\u26F0-\u26F5\u26F7-\u26FA\u26FD\u2702\u2705\u2708-\u270D\u270F\u2712\u2714\u2716\u271D\u2721\u2728\u2733\u2734\u2744\u2747\u274C\u274E\u2753-\u2755\u2757\u2763\u2764\u2795-\u2797\u27A1\u27B0\u27BF\u2934\u2935\u2B05-\u2B07\u2B1B\u2B1C\u2B50\u2B55\u3030\u303D\u3297\u3299\x{1F004}\x{1F0CF}\x{1F170}\x{1F171}\x{1F17E}\x{1F17F}\x{1F18E}\x{1F191}-\x{1F19A}\x{1F1E6}-\x{1F1FF}\x{1F201}\x{1F202}\x{1F21A}\x{1F22F}\x{1F232}-\x{1F23A}\x{1F250}\x{1F251}\x{1F300}-\x{1F321}\x{1F324}-\x{1F393}\x{1F396}\x{1F397}\x{1F399}-\x{1F39B}\x{1F39E}-\x{1F3F0}\x{1F3F3}-\x{1F3F5}\x{1F3F7}-\x{1F4FD}\x{1F4FF}-\x{1F53D}\x{1F549}-\x{1F54E}\x{1F550}-\x{1F567}\x{1F56F}\x{1F570}\x{1F573}-\x{1F57A}\x{1F587}\x{1F58A}-\x{1F58D}\x{1F590}\x{1F595}\x{1F596}\x{1F5A4}\x{1F5A5}\x{1F5A8}\x{1F5B1}\x{1F5B2}\x{1F5BC}\x{1F5C2}-\x{1F5C4}\x{1F5D1}-\x{1F5D3}\x{1F5DC}-\x{1F5DE}\x{1F5E1}\x{1F5E3}\x{1F5E8}\x{1F5EF}\x{1F5F3}\x{1F5FA}-\x{1F64F}\x{1F680}-\x{1F6C5}\x{1F6CB}-\x{1F6D2}\x{1F6D5}-\x{1F6D7}\x{1F6E0}-\x{1F6E5}\x{1F6E9}\x{1F6EB}\x{1F6EC}\x{1F6F0}\x{1F6F3}-\x{1F6FC}\x{1F7E0}-\x{1F7EB}\x{1F90C}-\x{1F93A}\x{1F93C}-\x{1F945}\x{1F947}-\x{1F978}\x{1F97A}-\x{1F9CB}\x{1F9CD}-\x{1F9FF}\x{1FA70}-\x{1FA74}\x{1FA78}-\x{1FA7A}\x{1FA80}-\x{1FA86}\x{1FA90}-\x{1FAA8}\x{1FAB0}-\x{1FAB6}\x{1FAC0}-\x{1FAC2}\x{1FAD0}-\x{1FAD6}]\uFE0F|[\u261D\u26F9\u270A-\u270D\x{1F385}\x{1F3C2}-\x{1F3C4}\x{1F3C7}\x{1F3CA}-\x{1F3CC}\x{1F442}\x{1F443}\x{1F446}-\x{1F450}\x{1F466}-\x{1F478}\x{1F47C}\x{1F481}-\x{1F483}\x{1F485}-\x{1F487}\x{1F48F}\x{1F491}\x{1F4AA}\x{1F574}\x{1F575}\x{1F57A}\x{1F590}\x{1F595}\x{1F596}\x{1F645}-\x{1F647}\x{1F64B}-\x{1F64F}\x{1F6A3}\x{1F6B4}-\x{1F6B6}\x{1F6C0}\x{1F6CC}\x{1F90C}\x{1F90F}\x{1F918}-\x{1F91F}\x{1F926}\x{1F930}-\x{1F939}\x{1F93C}-\x{1F93E}\x{1F977}\x{1F9B5}\x{1F9B6}\x{1F9B8}\x{1F9B9}\x{1F9BB}\x{1F9CD}-\x{1F9CF}\x{1F9D1}-\x{1F9DD}]"""
        val patternOld by lazy { Pattern.compile("$emojiRegexRGI|$emojiRegexOld", Pattern.UNICODE_CASE or Pattern.CASE_INSENSITIVE) }

        // 旧标准+文字类型
        val emojiRegexText = """[\xA9\xAE\u203C\u2049\u2122\u2139\u2194-\u2199\u21A9\u21AA\u231A\u231B\u2328\u23CF\u23E9-\u23F3\u23F8-\u23FA\u24C2\u25AA\u25AB\u25B6\u25C0\u25FB-\u25FE\u2600-\u2604\u260E\u2611\u2614\u2615\u2618\u261D\u2620\u2622\u2623\u2626\u262A\u262E\u262F\u2638-\u263A\u2640\u2642\u2648-\u2653\u265F\u2660\u2663\u2665\u2666\u2668\u267B\u267E\u267F\u2692-\u2697\u2699\u269B\u269C\u26A0\u26A1\u26A7\u26AA\u26AB\u26B0\u26B1\u26BD\u26BE\u26C4\u26C5\u26C8\u26CE\u26CF\u26D1\u26D3\u26D4\u26E9\u26EA\u26F0-\u26F5\u26F7-\u26FA\u26FD\u2702\u2705\u2708-\u270D\u270F\u2712\u2714\u2716\u271D\u2721\u2728\u2733\u2734\u2744\u2747\u274C\u274E\u2753-\u2755\u2757\u2763\u2764\u2795-\u2797\u27A1\u27B0\u27BF\u2934\u2935\u2B05-\u2B07\u2B1B\u2B1C\u2B50\u2B55\u3030\u303D\u3297\u3299\x{1F004}\x{1F0CF}\x{1F170}\x{1F171}\x{1F17E}\x{1F17F}\x{1F18E}\x{1F191}-\x{1F19A}\x{1F1E6}-\x{1F1FF}\x{1F201}\x{1F202}\x{1F21A}\x{1F22F}\x{1F232}-\x{1F23A}\x{1F250}\x{1F251}\x{1F300}-\x{1F321}\x{1F324}-\x{1F393}\x{1F396}\x{1F397}\x{1F399}-\x{1F39B}\x{1F39E}-\x{1F3F0}\x{1F3F3}-\x{1F3F5}\x{1F3F7}-\x{1F4FD}\x{1F4FF}-\x{1F53D}\x{1F549}-\x{1F54E}\x{1F550}-\x{1F567}\x{1F56F}\x{1F570}\x{1F573}-\x{1F57A}\x{1F587}\x{1F58A}-\x{1F58D}\x{1F590}\x{1F595}\x{1F596}\x{1F5A4}\x{1F5A5}\x{1F5A8}\x{1F5B1}\x{1F5B2}\x{1F5BC}\x{1F5C2}-\x{1F5C4}\x{1F5D1}-\x{1F5D3}\x{1F5DC}-\x{1F5DE}\x{1F5E1}\x{1F5E3}\x{1F5E8}\x{1F5EF}\x{1F5F3}\x{1F5FA}-\x{1F64F}\x{1F680}-\x{1F6C5}\x{1F6CB}-\x{1F6D2}\x{1F6D5}-\x{1F6D7}\x{1F6E0}-\x{1F6E5}\x{1F6E9}\x{1F6EB}\x{1F6EC}\x{1F6F0}\x{1F6F3}-\x{1F6FC}\x{1F7E0}-\x{1F7EB}\x{1F90C}-\x{1F93A}\x{1F93C}-\x{1F945}\x{1F947}-\x{1F978}\x{1F97A}-\x{1F9CB}\x{1F9CD}-\x{1F9FF}\x{1FA70}-\x{1FA74}\x{1FA78}-\x{1FA7A}\x{1FA80}-\x{1FA86}\x{1FA90}-\x{1FAA8}\x{1FAB0}-\x{1FAB6}\x{1FAC0}-\x{1FAC2}\x{1FAD0}-\x{1FAD6}]\uFE0F?|[#\*0-9][\u20E3\uFE0F]"""
        val patternText by lazy { Pattern.compile("$emojiRegexRGI|$emojiRegexText", Pattern.UNICODE_CASE or Pattern.CASE_INSENSITIVE) }
    }

    @IntDef(Type.RGI, Type.OLD, Type.TEXT)
    @Retention(AnnotationRetention.SOURCE)
    annotation class Type {
        companion object {
            const val RGI = 0 // RGI标准
            const val OLD = 1 // 旧标准
            const val TEXT = 2 // 旧标准+文字类型
        }
    }
}

editText.filters = arrayOf(EmojiFilter())

2) TextWatcher

不想写以后有空补充

editText.addTextChangedListener()

Emoji手动过滤方法

以下为旧内容为之前没用正则的过滤方式，不推荐使用仅供参考

  1. 匹配Emoji表情列表过滤，需要得到Emoji表情列表
  2. 区间过滤，可能多过滤也肯少过滤

链接1：Emoji列表过滤，但是直接从 Emoji Unicode Tables 网站获取的列表 4. Enclosed characters ( 24C2 - 1F251 ) 区间会和汉字冲突，实际范围是 24C2 和(1F170 - 1F251)，标题错了，作者没有修改直接把汉字内容(例如：我，们，有 ……)也过滤了，并且没有过滤 5. Uncategorized 忽略了许多表情。列表过滤相对准确，但是需要先加载列，虽然使用了静态方法但是首次使用要较长加载时间，过滤时匹配也相对耗时。

链接2：过滤区间，但是只过滤了双字节的Emoji表情，忽略了单字节的表情，并且区间也不合理（判断得很复杂，结果等同于直接过滤了 utf8 Surrogates，这样如果有其他的 Surrogates 区的编码字符也会被过滤掉）。相对列表过滤速度快，但存在多过滤和少过滤的较多。

综合两种情况考虑，既要保证速度又要保证过滤的准确性。Android EditView 以 UTF-16 为编码16位为一个单位。由于两字节以上的Unicode 编码基本上没用到，直接过滤掉 Surrogates 区(0xD800-0xDFFF)；再过滤掉单字节的Emoji表情列表。

当然为了确保绝对只过滤Emoji表情，这里使用1的方法，修改了 4. Enclosed characters ( 24C2 - 1F251 )，添加了 5. Uncategorized ，毕竟现在Android的处理器性能都很高，效率可以不用考虑了。当然也可以使用区间过滤，添加个 Scrope ，再修改下filter()方法就行了，这里就不修改了。

import android.text.InputFilter;
import android.text.Spanned;

import org.xutils.common.util.LogUtil;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 * 过滤Emoji表情
 * Created by tutu on 2016/5/31.
 */
public class EmojiFilter implements InputFilter {

    private static Set<String> filterSet = null;
    private static Set<Scope> scopeSet = null;

    /**
     * 区间类模型
     */
    private class Scope {
        int start;
        int end;

        @Override
        public boolean equals(Object o) {
            if (o instanceof Scope) {
                Scope scope = (Scope) o;
                if (scope.start == start && scope.end == end) {
                    return true;
                }
            }
            return super.equals(o);
        }
    }

    private static void addUnicodeRangeToSet(Set<String> set, int start, int end) {
        if (set == null) {
            return;
        }
        if (start > end) {
            return;
        }


        for (int i = start; i <= end; i++) {
            filterSet.add(new String(new int[]{i}, 0, 1));
        }
    }

    private static void addUnicodeRangeToSet(Set<String> set, int code) {
        if (set == null) {
            return;
        }
        filterSet.add(new String(new int[]{code}, 0, 1));
    }

    static {
        filterSet = new HashSet<String>();
        scopeSet = new HashSet<>();

        // See http://apps.timwhitlock.info/emoji/tables/unicode

        // 1. Emoticons ( 1F601 - 1F64F )
        addUnicodeRangeToSet(filterSet, 0x1F601, 0X1F64F);

        // 2. Dingbats ( 2702 - 27B0 )
        addUnicodeRangeToSet(filterSet, 0x2702, 0X27B0);

        // 3. Transport and map symbols ( 1F680 - 1F6C0 )
        addUnicodeRangeToSet(filterSet, 0X1F680, 0X1F6C0);

        // 4. Enclosed characters ( 24C2 - 1F251 )
        addUnicodeRangeToSet(filterSet, 0X24C2);
        addUnicodeRangeToSet(filterSet, 0X1F170, 0X1F251);

        // 6a. Additional emoticons ( 1F600 - 1F636 )
        addUnicodeRangeToSet(filterSet, 0X1F600, 0X1F636);

        // 6b. Additional transport and map symbols ( 1F681 - 1F6C5 )
        addUnicodeRangeToSet(filterSet, 0X1F681, 0X1F6C5);

        // 6c. Other additional symbols ( 1F30D - 1F567 )
        addUnicodeRangeToSet(filterSet, 0X1F30D, 0X1F567);

        // 5. Uncategorized
        addUnicodeRangeToSet(filterSet, 0X1F004);
        addUnicodeRangeToSet(filterSet, 0X1F0CF);
        // 与6c. Other additional symbols ( 1F30D - 1F567 )重复
        // 去掉重复部分虽然不去掉HashSet也不会重复，原范围（0X1F300 - 0X1F5FF）
        addUnicodeRangeToSet(filterSet, 0X1F300, 0X1F30D);
        addUnicodeRangeToSet(filterSet, 0X1F5FB, 0X1F5FF);
        addUnicodeRangeToSet(filterSet, 0X00A9);
        addUnicodeRangeToSet(filterSet, 0X00AE);
        addUnicodeRangeToSet(filterSet, 0X0023);
        //阿拉伯数字0-9，配合0X20E3使用
        //addUnicodeRangeToSet(filterSet, 0X0030, 0X0039);
        // 过滤掉203C开始后的2XXX 段落
        //addUnicodeRangeToSet(filterSet, 0X203C, 0X24C2);
        addUnicodeRangeToSet(filterSet, 0X203C);
        addUnicodeRangeToSet(filterSet, 0X2049);
        //严格验证的话需要判断前面是否是数字
        //Android上显示和数字分开可以不判断
        addUnicodeRangeToSet(filterSet, 0X20E3);
        addUnicodeRangeToSet(filterSet, 0X2122);
        addUnicodeRangeToSet(filterSet, 0X2139);
        addUnicodeRangeToSet(filterSet, 0X2194, 0X2199);
        addUnicodeRangeToSet(filterSet, 0X21A9, 0X21AA);
        addUnicodeRangeToSet(filterSet, 0X231A, 0X231B);
        addUnicodeRangeToSet(filterSet, 0X23E9, 0X23EC);
        addUnicodeRangeToSet(filterSet, 0X23F0);
        addUnicodeRangeToSet(filterSet, 0X23F3);
        addUnicodeRangeToSet(filterSet, 0X25AA, 0X25AB);
        addUnicodeRangeToSet(filterSet, 0X25FB, 0X25FE);
        //TODO： 26XX 太杂全部过滤
        addUnicodeRangeToSet(filterSet, 0X2600, 0X26FE);
        addUnicodeRangeToSet(filterSet, 0X2934, 0X2935);
        addUnicodeRangeToSet(filterSet, 0X2B05, 0X2B07);
        addUnicodeRangeToSet(filterSet, 0X2B1B, 0X2B1C);
        addUnicodeRangeToSet(filterSet, 0X2B50);
        addUnicodeRangeToSet(filterSet, 0X2B55);
        addUnicodeRangeToSet(filterSet, 0X3030);
        addUnicodeRangeToSet(filterSet, 0X303D);
        addUnicodeRangeToSet(filterSet, 0X3297);
        addUnicodeRangeToSet(filterSet, 0X3299);
    }

    public EmojiFilter() {
        super();
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
                               int dend) {
        // check black-list set
        for (int i = 0; i < source.length(); i++) {
            LogUtil.e(Integer.toHexString(source.charAt(i)));
        }
        LogUtil.e(source.toString() + " length： " + source.toString().length() +
                " ；bytes length： " + source.toString().getBytes().length);
//        Iterator<String> iterator = filterSet.iterator();
//        while (iterator.hasNext()) {
//            String filter = iterator.next();
//            if (filter.equals(source.toString())) {
//                LogUtil.e(filter + " length： " + filter.length() +
//                        " ；bytes length： " + filter.getBytes().length);
//                for (int i= 0; i < source.length(); i++){
//                    LogUtil.e(Integer.toHexString(source.charAt(i)));
//                }
//                return "";
//            }
//        }
        if (filterSet.contains(source.toString())) {
            return "";
        }
        return source;
    }

}

Emoji相关链接

  1. android 输入框EditText禁止输入Emoji表情符
  2. Android中过滤Emoji表情 完整版
  3. 彻底搞懂字符编码(unicode,mbcs,utf-8,utf-16,utf-32,big endian,little endian...)
  4. Full Emoji List
  5. emoji-test.txt

吐槽

小日本真能折腾，没事搞什么Emoji，没事过滤Emoji干嘛

本作品采用知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议进行许可。转载请保留作者及原文链接

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