up

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

@@ -27,6 +27,7 @@ class ChapterListActivity : VMBaseActivity<ChapterListViewModel>(R.layout.activi
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         setSupportActionBar(toolbar)
         viewModel.bookUrl = intent.getStringExtra("bookUrl")
+        viewModel.loadBook()
         view_pager.adapter = TabFragmentPageAdapter(supportFragmentManager)
         tab_layout.setupWithViewPager(view_pager)
     }

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

@@ -13,6 +13,7 @@ import io.legado.app.base.VMBaseFragment
 import io.legado.app.data.entities.BookChapter
 import io.legado.app.utils.getViewModelOfActivity
 import kotlinx.android.synthetic.main.fragment_chapter_list.*
+import org.jetbrains.anko.sdk27.listeners.onClick
 
 class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragment_chapter_list) {
     override val viewModel: ChapterListViewModel
@@ -24,6 +25,7 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         initRecyclerView()
+        initView()
         initData()
     }
 
@@ -38,4 +40,23 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
         liveData = LivePagedListBuilder(App.db.bookChapterDao().observeByBook(viewModel.bookUrl ?: ""), 30).build()
         liveData?.observe(viewLifecycleOwner, Observer { adapter.submitList(it) })
     }
+
+    private fun initView() {
+        viewModel.bookDate.value?.let {
+            tv_current_chapter_info.text = it.durChapterTitle
+        } ?: viewModel.bookDate.observe(viewLifecycleOwner, Observer {
+            tv_current_chapter_info.text = it.durChapterTitle
+        })
+        iv_chapter_top.onClick { recycler_view.scrollToPosition(0) }
+        iv_chapter_bottom.onClick {
+            if (adapter.itemCount > 0) {
+                recycler_view.scrollToPosition(adapter.itemCount - 1)
+            }
+        }
+        tv_current_chapter_info.onClick {
+            viewModel.bookDate.value?.let {
+                recycler_view.scrollToPosition(it.durChapterIndex)
+            }
+        }
+    }
 }

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

@@ -2,10 +2,23 @@ package io.legado.app.ui.chapterlist
 
 
 import android.app.Application
+import androidx.lifecycle.MutableLiveData
+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 bookDate = MutableLiveData<Book>()
     var bookUrl: String? = null
 
+    fun loadBook() {
+        execute {
+            bookUrl?.let {
+                App.db.bookDao().getBook(it)?.let { book ->
+                    bookDate.postValue(book)
+                }
+            }
+        }
+    }
 }

app/src/main/res/layout/fragment_chapter_list.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:descendantFocusability="blocksDescendants">
@@ -30,6 +31,7 @@
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
+            android:background="?android:attr/selectableItemBackgroundBorderless"
             android:ellipsize="middle"
             android:paddingLeft="10dp"
             android:paddingRight="10dp"
@@ -45,7 +47,9 @@
             android:background="?android:attr/selectableItemBackgroundBorderless"
             android:contentDescription="@string/go_to_top"
             android:src="@drawable/ic_arrow_drop_up"
-            app:tint="@color/tv_text_default" />
+            android:tooltipText="@string/go_to_top"
+            app:tint="@color/tv_text_default"
+            tools:ignore="UnusedAttribute" />
 
         <androidx.appcompat.widget.AppCompatImageView
             android:id="@+id/iv_chapter_bottom"
@@ -54,7 +58,9 @@
             android:background="?android:attr/selectableItemBackgroundBorderless"
             android:contentDescription="@string/go_to_bottom"
             android:src="@drawable/ic_arrow_drop_down"
-            app:tint="@color/tv_text_default" />
+            android:tooltipText="@string/go_to_bottom"
+            app:tint="@color/tv_text_default"
+            tools:ignore="UnusedAttribute" />
     </LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>