优化

app/src/main/java/io/legado/app/ui/chapterlist/ChapterListActivity.kt

@@ -28,11 +28,9 @@ class ChapterListActivity : VMBaseActivity<ChapterListViewModel>(R.layout.activi
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         tab_layout.isTabIndicatorFullWidth = false
         tab_layout.setSelectedTabIndicatorColor(accentColor)
-        viewModel.bookUrl = intent.getStringExtra("bookUrl")
-        viewModel.loadBook {
-            view_pager.adapter = TabFragmentPageAdapter(supportFragmentManager)
-            tab_layout.setupWithViewPager(view_pager)
-        }
+        viewModel.bookUrl = intent.getStringExtra("bookUrl") ?: ""
+        view_pager.adapter = TabFragmentPageAdapter(supportFragmentManager)
+        tab_layout.setupWithViewPager(view_pager)
     }
 
     override fun onCompatCreateOptionsMenu(menu: Menu): Boolean {

app/src/main/java/io/legado/app/ui/chapterlist/ChapterListFragment.kt

@@ -4,6 +4,7 @@ import android.app.Activity.RESULT_OK
 import android.content.Intent
 import android.os.Bundle
 import android.view.View
+import androidx.lifecycle.LiveData
 import androidx.lifecycle.Observer
 import io.legado.app.App
 import io.legado.app.R
@@ -15,6 +16,8 @@ import io.legado.app.ui.widget.recycler.UpLinearLayoutManager
 import io.legado.app.utils.getVerticalDivider
 import io.legado.app.utils.getViewModelOfActivity
 import kotlinx.android.synthetic.main.fragment_chapter_list.*
+import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.launch
 import org.jetbrains.anko.sdk27.listeners.onClick
 
 class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragment_chapter_list),
@@ -24,15 +27,18 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
         get() = getViewModelOfActivity(ChapterListViewModel::class.java)
 
     lateinit var adapter: ChapterListAdapter
+    private var book: Book? = null
     private var durChapterIndex = 0
     private lateinit var mLayoutManager: UpLinearLayoutManager
+    private var tocLiveData: LiveData<List<BookChapter>>? = null
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         viewModel.chapterCallBack = this
         initRecyclerView()
         initView()
-        initData()
+        initBook()
+        initDoc()
     }
 
     private fun initRecyclerView() {
@@ -43,20 +49,26 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
         recycler_view.adapter = adapter
     }
 
-    private fun initData() {
-        viewModel.bookUrl?.let { bookUrl ->
-            App.db.bookChapterDao().observeByBook(bookUrl).observe(viewLifecycleOwner, Observer {
-                adapter.setItems(it)
-                if (it.isEmpty()) return@Observer
-                viewModel.book?.let { book ->
-                    durChapterIndex = book.durChapterIndex
-                    tv_current_chapter_info.text = it[durChapterIndex()].title
-                    mLayoutManager.scrollToPositionWithOffset(durChapterIndex, 0)
-                }
-            })
+    private fun initBook() {
+        launch(IO) {
+            book = App.db.bookDao().getBook(viewModel.bookUrl)
         }
     }
 
+    private fun initDoc() {
+        tocLiveData?.removeObservers(this@ChapterListFragment)
+        tocLiveData = App.db.bookChapterDao().observeByBook(viewModel.bookUrl)
+        tocLiveData?.observe(viewLifecycleOwner, Observer {
+            adapter.setItems(it)
+            if (it.isEmpty()) return@Observer
+            book?.let { book ->
+                durChapterIndex = book.durChapterIndex
+                tv_current_chapter_info.text = it[durChapterIndex()].title
+                mLayoutManager.scrollToPositionWithOffset(durChapterIndex, 0)
+            }
+        })
+    }
+
     private fun initView() {
         ll_chapter_base_info.setBackgroundColor(backgroundColor)
         iv_chapter_top.onClick { mLayoutManager.scrollToPositionWithOffset(0, 0) }
@@ -66,7 +78,7 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
             }
         }
         tv_current_chapter_info.onClick {
-            viewModel.book?.let {
+            book?.let {
                 mLayoutManager.scrollToPositionWithOffset(it.durChapterIndex, 0)
             }
         }
@@ -74,9 +86,11 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
 
     override fun startChapterListSearch(newText: String?) {
         if (newText.isNullOrBlank()) {
-            initData()
+            initDoc()
         } else {
-            App.db.bookChapterDao().liveDataSearch(viewModel.bookUrl ?: "", newText).observe(viewLifecycleOwner, Observer {
+            tocLiveData?.removeObservers(this)
+            tocLiveData = App.db.bookChapterDao().liveDataSearch(viewModel.bookUrl, newText)
+            tocLiveData?.observe(viewLifecycleOwner, Observer {
                 adapter.setItems(it)
                 mLayoutManager.scrollToPositionWithOffset(0, 0)
             })
@@ -93,6 +107,6 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
     }
 
     override fun book(): Book? {
-        return viewModel.book
+        return book
     }
 }

app/src/main/java/io/legado/app/ui/chapterlist/ChapterListViewModel.kt

@@ -2,26 +2,13 @@ package io.legado.app.ui.chapterlist
 
 
 import android.app.Application
-import io.legado.app.App
 import io.legado.app.base.BaseViewModel
-import io.legado.app.data.entities.Book
 
 class ChapterListViewModel(application: Application) : BaseViewModel(application) {
-    var bookUrl: String? = null
-    var book: Book? = null
+    var bookUrl: String = ""
     var chapterCallBack: ChapterListCallBack? = null
     var bookMarkCallBack: BookmarkCallBack? = null
 
-    fun loadBook(success: () -> Unit) {
-        execute {
-            bookUrl?.let {
-                book = App.db.bookDao().getBook(it)
-            }
-        }.onSuccess {
-            success()
-        }
-    }
-
     fun startChapterListSearch(newText: String?) {
         chapterCallBack?.startChapterListSearch(newText)
     }