feat: 优化代码

app/src/main/java/io/legado/app/service/BaseReadAloudService.kt

@@ -111,7 +111,9 @@ abstract class BaseReadAloudService : BaseService(),
                 if (getPrefBoolean(PreferKey.readAloudByPage)) {
                     for (index in pageIndex..textChapter.lastIndex()) {
                         textChapter.page(index)?.text?.split("\n")?.let {
-                            contentList.addAll(it)
+                            if (it.isNotEmpty()) {
+                                contentList.addAll(it)
+                            }
                         }
                     }
                 } else {

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -609,9 +609,6 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
      * 朗读按钮
      */
     override fun onClickReadAloud() {
-        if (!BaseReadAloudService.isRun) {
-            SystemUtils.ignoreBatteryOptimization(this)
-        }
         when {
             !BaseReadAloudService.isRun -> ReadBook.readAloud()
             BaseReadAloudService.pause -> ReadAloud.resume(this)

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

@@ -12,10 +12,7 @@ data class TextChapter(
     val chaptersSize: Int
 ) {
     fun page(index: Int): TextPage? {
-        if (index >= 0 && index < pages.size) {
+        return pages.getOrNull(index)
-            return pages[index]
-        }
-        return null
     }
 
     fun lastPage(): TextPage? {
@@ -25,20 +22,6 @@ data class TextChapter(
         return null
     }
 
-    fun scrollPage(): TextPage? {
-        if (pages.isNotEmpty()) {
-            val stringBuilder = StringBuilder()
-            pages.forEach {
-                stringBuilder.append(it.text)
-            }
-            return TextPage(
-                index = 0, text = stringBuilder.toString(), title = title,
-                pageSize = pages.size, chapterSize = chaptersSize, chapterIndex = position
-            )
-        }
-        return null
-    }
-
     fun lastIndex(): Int {
         return pages.size - 1
     }
@@ -70,28 +53,6 @@ data class TextChapter(
         return stringBuilder.toString()
     }
 
-    fun getStartLine(pageIndex: Int): Int {
-        if (pageLines.size > pageIndex) {
-            var lines = 0
-            for (index: Int in 0 until pageIndex) {
-                lines += pageLines[index] + 1
-            }
-            return lines
-        }
-        return 0
-    }
-
-    fun getPageIndex(line: Int): Int {
-        var lines = 0
-        for (pageIndex in pageLines.indices) {
-            lines += pageLines[pageIndex] + 1
-            if (line < lines) {
-                return pageIndex
-            }
-        }
-        return 0
-    }
-
     fun getContent(): String {
         val stringBuilder = StringBuilder()
         pages.forEach {