up

app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt

@@ -256,6 +256,14 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
         }
     }
 
+    override fun moveToNextChapter() {
+        viewModel.moveToNextChapter()
+    }
+
+    override fun moveToPrevChapter() {
+        viewModel.moveToPrevChapter()
+    }
+
     private fun onClickReadAloud() {
         if (!ReadAloudService.isRun) {
             readAloudStatus = Status.STOP

app/src/main/java/io/legado/app/ui/readbook/ReadBookViewModel.kt

@@ -197,6 +197,24 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
+    fun moveToNextChapter() {
+        durChapterIndex++
+        prevTextChapter = curTextChapter
+        curTextChapter = nextTextChapter
+        bookData.value?.let {
+            loadContent(it, durChapterIndex.plus(1))
+        }
+    }
+
+    fun moveToPrevChapter() {
+        durChapterIndex--
+        nextTextChapter = curTextChapter
+        curTextChapter = prevTextChapter
+        bookData.value?.let {
+            loadContent(it, durChapterIndex.minus(1))
+        }
+    }
+
     override fun onCleared() {
         super.onCleared()
         ReadAloudService.stop(context)

app/src/main/java/io/legado/app/ui/widget/page/DataSource.kt

@@ -20,6 +20,10 @@ interface DataSource {
 
     fun hasPrevChapter(): Boolean
 
+    fun moveToNextChapter()
+
+    fun moveToPrevChapter()
+
     interface CallBack {
         fun onLoadFinish(bookChapter: BookChapter, content: String)
     }

app/src/main/java/io/legado/app/ui/widget/page/PageView.kt

@@ -70,6 +70,14 @@ class PageView(context: Context, attrs: AttributeSet) : FrameLayout(context, att
                 }
                 return false
             }
+
+            override fun moveToNextChapter() {
+                callback?.moveToNextChapter()
+            }
+
+            override fun moveToPrevChapter() {
+                callback?.moveToPrevChapter()
+            }
         }))
     }
 
@@ -201,5 +209,7 @@ class PageView(context: Context, attrs: AttributeSet) : FrameLayout(context, att
         fun durChapterPos(pageSize: Int): Int
         fun textChapter(chapterOnDur: Int = 0): TextChapter?
         fun loadChapter(index: Int)
+        fun moveToNextChapter()
+        fun moveToPrevChapter()
     }
 }

app/src/main/java/io/legado/app/ui/widget/page/TextChapter.kt

@@ -20,6 +20,14 @@ data class TextChapter(
         return null
     }
 
+    fun lastIndex(): Int {
+        return pages.size - 1
+    }
+
+    fun isLastIndex(index: Int): Boolean {
+        return index == pages.size - 1
+    }
+
     fun pageSize(): Int {
         return pages.size
     }

app/src/main/java/io/legado/app/ui/widget/page/TextPageFactory.kt

@@ -39,7 +39,12 @@ class TextPageFactory private constructor(dataSource: DataSource) :
 
     override fun moveToNext(): Boolean {
         return if (hasNext()) {
-            index = index.plus(1)
+            index = if (dataSource.getCurrentChapter()?.isLastIndex(index) == true) {
+                dataSource.moveToNextChapter()
+                0
+            } else {
+                index.plus(1)
+            }
             true
         } else
             false
@@ -47,7 +52,12 @@ class TextPageFactory private constructor(dataSource: DataSource) :
 
     override fun moveToPrevious(): Boolean {
         return if (hasPrev()) {
-            index = index.minus(1)
+            index = if (index > 0) {
+                index.minus(1)
+            } else {
+                dataSource.moveToPrevChapter()
+                dataSource.getPreviousChapter()?.lastIndex() ?: 0
+            }
             true
         } else
             false
@@ -59,14 +69,25 @@ class TextPageFactory private constructor(dataSource: DataSource) :
     }
 
     override fun nextPage(): TextPage? {
+        dataSource.getCurrentChapter()?.let {
+            if (index < it.pageSize() - 1) {
                 return dataSource.getCurrentChapter()?.page(index + 1)
                     ?: TextPage(index + 1, "index：${index + 1}", "index：${index + 1}")
             }
+        }
+        return dataSource.getNextChapter()?.page(0)
+            ?: TextPage(index + 1, "index：${index + 1}", "index：${index + 1}")
+    }
 
     override fun previousPage(): TextPage? {
+        if (index > 0) {
             return dataSource.getCurrentChapter()?.page(index - 1)
                 ?: TextPage(index - 1, "index：${index - 1}", "index：${index - 1}")
         }
 
+        return dataSource.getPreviousChapter()?.lastPage()
+            ?: TextPage(index - 1, "index：${index - 1}", "index：${index - 1}")
+    }
+
 
 }