feat: 优化代码

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

@@ -44,7 +44,8 @@ class BookmarkFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragment_
 
     private fun initData() {
         bookmarkLiveData?.removeObservers(viewLifecycleOwner)
-        bookmarkLiveData = LivePagedListBuilder(App.db.bookmarkDao().observeByBook(viewModel.bookUrl ?: ""), 20).build()
+        bookmarkLiveData =
+            LivePagedListBuilder(App.db.bookmarkDao().observeByBook(viewModel.bookUrl), 20).build()
         bookmarkLiveData?.observe(viewLifecycleOwner, Observer { adapter.submitList(it) })
     }
 
@@ -53,7 +54,12 @@ class BookmarkFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragment_
             initData()
         } else {
             bookmarkLiveData?.removeObservers(viewLifecycleOwner)
-            bookmarkLiveData = LivePagedListBuilder(App.db.bookmarkDao().liveDataSearch(viewModel.bookUrl ?: "", newText), 20).build()
+            bookmarkLiveData = LivePagedListBuilder(
+                App.db.bookmarkDao().liveDataSearch(
+                    viewModel.bookUrl,
+                    newText
+                ), 20
+            ).build()
             bookmarkLiveData?.observe(viewLifecycleOwner, Observer { adapter.submitList(it) })
         }
     }