diff --git a/app/src/main/java/io/legado/app/utils/StringExtensions.kt b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
index 7443c0244..3c2703311 100644
--- a/app/src/main/java/io/legado/app/utils/StringExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
@@ -55,6 +55,9 @@ fun String.splitNotBlank(regex: Regex, limit: Int = 0): Array<String> = run {
     this.split(regex, limit).map { it.trim() }.filterNot { it.isBlank() }.toTypedArray()
 }
 
+/**
+ * 将字符串拆分为单个字符,包含emoji
+ */
 fun String.toStringArray(): Array<String> {
     var codePointIndex = 0
     return Array(codePointCount(0, length)) {
@@ -66,14 +69,3 @@ fun String.toStringArray(): Array<String> {
     }
 }
 
-fun Char?.isHAN(): Boolean {
-    this ?: return false
-    val ub: Character.UnicodeBlock = Character.UnicodeBlock.of(this) ?: return false
-    return ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
-            || ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
-            || ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
-            || ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C
-            || ub === Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D
-            || ub === Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
-            || ub === Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT
-}