Unicode絵文字がたくさん並ぶと改行位置の検出がとても遅くなる問題の対策

app/src/main/java/jp/juggler/subwaytooter/ActAccountSetting.kt

@@ -1091,12 +1091,10 @@ class ActAccountSetting : AsyncActivity(), View.OnClickListener,
 							return opener.mimeType.toMediaType()
 						}
 						
-						@Throws(IOException::class)
 						override fun contentLength() : Long {
 							return size
 						}
 						
-						@Throws(IOException::class)
 						override fun writeTo(sink : BufferedSink) {
 							opener.open().use { inData ->
 								val tmp = ByteArray(4096)
@@ -1449,7 +1447,6 @@ class ActAccountSetting : AsyncActivity(), View.OnClickListener,
 		
 		val uri : Uri
 		
-		@Throws(IOException::class)
 		fun open() : InputStream
 		
 		fun deleteTempFile()
@@ -1502,7 +1499,6 @@ class ActAccountSetting : AsyncActivity(), View.OnClickListener,
 							override val uri : Uri
 								get() = uriArg
 							
-							@Throws(IOException::class)
 							override fun open() = FileInputStream(temp_file)
 							
 							override fun deleteTempFile() {
@@ -1530,7 +1526,6 @@ class ActAccountSetting : AsyncActivity(), View.OnClickListener,
 			override val uri : Uri
 				get() = uriArg
 			
-			@Throws(IOException::class)
 			override fun open() : InputStream {
 				return contentResolver.openInputStream(uri) ?: error("openInputStream returns null")
 			}

app/src/main/java/jp/juggler/subwaytooter/util/DecodeOptions.kt

@@ -2,6 +2,8 @@ package jp.juggler.subwaytooter.util
 
 import android.content.Context
 import android.text.Spannable
+import android.text.SpannableStringBuilder
+import android.text.style.ReplacementSpan
 import jp.juggler.subwaytooter.api.entity.CustomEmoji
 import jp.juggler.subwaytooter.api.entity.NicoProfileEmoji
 import jp.juggler.subwaytooter.api.entity.TootAttachmentLike
@@ -25,7 +27,7 @@ class DecodeOptions(
 	var enlargeEmoji : Float = 1f,
 	var forceHtml : Boolean = false, // force use HTML instead of Misskey Markdown
 	var mentionFullAcct : Boolean = false,
-	var mentions: ArrayList<TootMention>? = null
+	var mentions : ArrayList<TootMention>? = null
 ) {
 	
 	internal fun isMediaAttachment(url : String?) : Boolean {
@@ -38,23 +40,46 @@ class DecodeOptions(
 	}
 	
 	// OUTPUT
-	var highlightSound: HighlightWord? = null
-	var highlightSpeech: HighlightWord? = null
-	var highlightAny: HighlightWord? = null
+	var highlightSound : HighlightWord? = null
+	var highlightSpeech : HighlightWord? = null
+	var highlightAny : HighlightWord? = null
 	
 	////////////////////////
 	// decoder
 	
+	// AndroidのStaticLayoutはパラグラフ中に絵文字が沢山あると異常に遅いので、絵文字が連続して登場したら改行文字を挿入する
+	private fun SpannableStringBuilder.workaroundForEmojiLineBreak() : SpannableStringBuilder {
+		
+		val spans = getSpans(0, length, ReplacementSpan::class.java)
+		if(spans != null) {
+			val insertList = ArrayList<Int>()
+			spans.sortBy { getSpanStart(it) }
+			var repeatCount = 0
+			var preEnd : Int? = null
+			for(span in spans) {
+				val start = getSpanStart(span)
+				if(start != preEnd) {
+					repeatCount = 0
+				} else if(++ repeatCount >= 12) {
+					repeatCount = 0
+					insertList.add(start)
+				}
+				preEnd = getSpanEnd(span)
+			}
+			// 後ろから順に挿入する
+			insertList.reversed().forEach { insert(it, "\n") }
+		}
+		return this
+	}
+	
 	fun decodeHTML(html : String?) =
-		HTMLDecoder.decodeHTML(this, html)
+		HTMLDecoder.decodeHTML(this, html).workaroundForEmojiLineBreak()
 	
 	fun decodeEmoji(s : String?) : Spannable =
-		EmojiDecoder.decodeEmoji(this, s ?: "")
+		EmojiDecoder.decodeEmoji(this, s ?: "").workaroundForEmojiLineBreak()
 	
 	fun decodeEmojiNullable(s : String?) = when(s) {
 		null -> null
 		else -> EmojiDecoder.decodeEmoji(this, s)
 	}
-	
-	
 }

app/src/main/java/jp/juggler/subwaytooter/util/EmojiDecoder.kt

@@ -2,7 +2,6 @@ package jp.juggler.subwaytooter.util
 
 import android.content.Context
 import android.content.SharedPreferences
-import android.text.Spannable
 import android.text.SpannableStringBuilder
 import android.text.Spanned
 import android.util.SparseBooleanArray
@@ -348,7 +347,7 @@ object EmojiDecoder {
 	private val reNicoru = """\Anicoru\d*\z""".asciiPattern( Pattern.CASE_INSENSITIVE)
 	private val reHohoemi = """\Ahohoemi\d*\z""".asciiPattern( Pattern.CASE_INSENSITIVE)
 	
-	fun decodeEmoji(options : DecodeOptions, s : String) : Spannable {
+	fun decodeEmoji(options : DecodeOptions, s : String) : SpannableStringBuilder {
 		
 		val builder = EmojiStringBuilder(options)