up

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

@@ -7,6 +7,7 @@ import android.view.MenuItem
 import android.view.animation.Animation
 import android.view.animation.AnimationUtils
 import androidx.core.view.isVisible
+import androidx.lifecycle.Observer
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
@@ -39,6 +40,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
         setSupportActionBar(toolbar)
         initAnimation()
         initView()
+        viewModel.chapterMaxIndex.observe(this, Observer { })
         viewModel.initData(intent)
         savedInstanceState?.let {
             changeSourceDialog = supportFragmentManager.findFragmentByTag(ChangeSourceDialog.tag) as? ChangeSourceDialog

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

@@ -6,6 +6,7 @@ import androidx.lifecycle.MediatorLiveData
 import io.legado.app.App
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.entities.Book
+import io.legado.app.data.entities.BookChapter
 import io.legado.app.data.entities.BookSource
 import io.legado.app.help.BookHelp
 import io.legado.app.model.WebBook
@@ -47,8 +48,15 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     }
 
 
-    fun download(book: Book, index: Int) {
+    fun getContent(book: Book, index: Int) {
         App.db.bookChapterDao().getChapter(book.bookUrl, index)?.let { chapter ->
+            BookHelp.getContent(book, chapter)?.let {
+
+            } ?: download(book, chapter)
+        }
+    }
+
+    private fun download(book: Book, chapter: BookChapter) {
         webBook?.getContent(book, chapter)
             ?.onSuccess(IO) { content ->
                 content?.let {
@@ -57,4 +65,3 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
             }
     }
 }
-}