【功能】为墨水屏模式增加自动下划线高亮 (#5207)

* Feat: Auto add underline for highlight in E-Ink mode

* Feat: Unify search result highlight to underline in E-Ink mode

* Feat: Create a simplified workflow for building signed release APK

* Fix: Restore original signing method for release build

* Feat: Create final workflow to build and release signed APK with custom body

* Feat: Finalized custom release workflow

* Chore: Revert workflow file to original version

* Fix: Adjust underline vertical position for visual perfection

app/src/main/java/io/legado/app/ui/book/read/page/entities/TextLine.kt

@@ -160,6 +160,17 @@ data class TextLine(
                 columns[i].draw(view, canvas)
             }
         }
+
+        // 墨水屏模式下的朗读和搜索下划线
+        if (AppConfig.isEInkMode && (isReadAloud || searchResultColumnCount > 0)) {
+            val underlinePaint = PaintPool.obtain()
+            underlinePaint.set(ChapterProvider.contentPaint)
+            underlinePaint.strokeWidth = 1.dpToPx().toFloat()
+            val lineY = height - 1.dpToPx()
+            canvas.drawLine(lineStart + indentWidth, lineY, lineEnd, lineY, underlinePaint)
+            PaintPool.recycle(underlinePaint)
+        }
+        
         if (ReadBookConfig.underline && !isImage && ReadBook.book?.isImage != true) {
             drawUnderline(canvas)
         }

app/src/main/java/io/legado/app/ui/book/searchContent/SearchResult.kt

@@ -2,6 +2,7 @@ package io.legado.app.ui.book.searchContent
 
 import android.text.Spanned
 import androidx.core.text.HtmlCompat
+import io.legado.app.help.config.AppConfig
 
 data class SearchResult(
     val resultCount: Int = 0,
@@ -22,23 +23,39 @@ data class SearchResult(
             val leftString = resultText.substring(0, queryIndexInSurrounding)
             val rightString =
                 resultText.substring(queryIndexInSurrounding + query.length, resultText.length)
-            val html = buildString {
-                append(chapterTitle.colorTextForHtml(accentColor))
-                append("<br>")
-                append(leftString.colorTextForHtml(textColor))
-                append(query.colorTextForHtml(accentColor))
-                append(rightString.colorTextForHtml(textColor))
+            
+            // 检查是否为墨水屏模式
+            val html = if (AppConfig.isEInkMode) {
+                // 墨水屏模式：使用下划线
+                buildString {
+                    append("<u>${chapterTitle}</u>")
+                    append("<br>")
+                    append(leftString)
+                    append("<u>${query}</u>")
+                    append(rightString)
+                }
+            } else {
+                // 普通模式：使用颜色
+                buildString {
+                    append(chapterTitle.colorTextForHtml(accentColor))
+                    append("<br>")
+                    append(leftString.colorTextForHtml(textColor))
+                    append(query.colorTextForHtml(accentColor))
+                    append(rightString.colorTextForHtml(textColor))
+                }
             }
             HtmlCompat.fromHtml(html, HtmlCompat.FROM_HTML_MODE_LEGACY)
         } else {
-            HtmlCompat.fromHtml(
-                resultText.colorTextForHtml(textColor),
-                HtmlCompat.FROM_HTML_MODE_LEGACY
-            )
+            val html = if (AppConfig.isEInkMode) {
+                resultText
+            } else {
+                resultText.colorTextForHtml(textColor)
+            }
+            HtmlCompat.fromHtml(html, HtmlCompat.FROM_HTML_MODE_LEGACY)
         }
     }
 
     private fun String.colorTextForHtml(textColor: String) =
         "<font color=#${textColor}>$this</font>"
 
-}
+}