up

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

@@ -60,6 +60,9 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
     override val viewModel: ReadBookViewModel
         get() = getViewModel(ReadBookViewModel::class.java)
 
+    override val isInitFinish: Boolean
+        get() = viewModel.isInitFinish
+
     private val requestCodeChapterList = 568
     private val requestCodeEditSource = 111
     private val requestCodeReplace = 31242

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

@@ -19,6 +19,8 @@ import kotlinx.coroutines.withContext
 
 class ReadBookViewModel(application: Application) : BaseViewModel(application) {
 
+    var isInitFinish = false
+
     fun initData(intent: Intent) {
         execute {
             ReadBook.inBookshelf = intent.getBooleanExtra("inBookshelf", true)
@@ -37,6 +39,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     private fun initBook(book: Book) {
         if (ReadBook.book?.bookUrl != book.bookUrl) {
             ReadBook.resetData(book)
+            isInitFinish = true
             val count = App.db.bookChapterDao().getChapterCount(book.bookUrl)
             if (count == 0) {
                 if (book.tocUrl.isEmpty()) {
@@ -55,6 +58,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
                 ReadBook.saveRead()
             }
         } else {
+            isInitFinish = true
             ReadBook.titleDate.postValue(book.name)
             if (ReadBook.chapterSize == 0) {
                 if (book.tocUrl.isEmpty()) {

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

@@ -191,15 +191,15 @@ class PageView(context: Context, attrs: AttributeSet) :
     }
 
     override fun getCurrentChapter(): TextChapter? {
-        return ReadBook.textChapter(0)
+        return if (callBack?.isInitFinish == true) ReadBook.textChapter(0) else null
     }
 
     override fun getNextChapter(): TextChapter? {
-        return ReadBook.textChapter(1)
+        return if (callBack?.isInitFinish == true) ReadBook.textChapter(1) else null
     }
 
     override fun getPreviousChapter(): TextChapter? {
-        return ReadBook.textChapter(-1)
+        return if (callBack?.isInitFinish == true) ReadBook.textChapter(-1) else null
     }
 
     override fun hasNextChapter(): Boolean {
@@ -244,5 +244,6 @@ class PageView(context: Context, attrs: AttributeSet) :
          */
         fun clickCenter()
 
+        val isInitFinish: Boolean
     }
 }