优化

app/src/main/java/io/legado/app/ui/book/changesource/ChangeChapterSourceDialog.kt

@@ -1,13 +1,13 @@
 package io.legado.app.ui.book.changesource
 
+import android.content.DialogInterface
 import android.os.Bundle
-import android.view.Menu
-import android.view.MenuItem
-import android.view.View
-import android.view.ViewGroup
+import android.view.*
+import android.view.KeyEvent.ACTION_UP
 import androidx.appcompat.widget.SearchView
 import androidx.appcompat.widget.Toolbar
 import androidx.core.os.bundleOf
+import androidx.core.view.isVisible
 import androidx.fragment.app.viewModels
 import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.R
@@ -35,6 +35,7 @@ import kotlinx.coroutines.launch
 
 class ChangeChapterSourceDialog() : BaseDialogFragment(R.layout.dialog_chapter_change_source),
     Toolbar.OnMenuItemClickListener,
+    DialogInterface.OnKeyListener,
     ChangeChapterSourceAdapter.CallBack,
     ChangeChapterTocAdapter.Callback {
 
@@ -78,6 +79,7 @@ class ChangeChapterSourceDialog() : BaseDialogFragment(R.layout.dialog_chapter_c
     override fun onStart() {
         super.onStart()
         setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
+        dialog?.setOnKeyListener(this)
     }
 
     override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) {
@@ -325,6 +327,18 @@ class ChangeChapterSourceDialog() : BaseDialogFragment(R.layout.dialog_chapter_c
         }
     }
 
+    override fun onKey(dialog: DialogInterface?, keyCode: Int, event: KeyEvent?): Boolean {
+        when (keyCode) {
+            KeyEvent.KEYCODE_BACK -> event?.let {
+                if (it.action == ACTION_UP && binding.clToc.isVisible) {
+                    binding.clToc.gone()
+                    return true
+                }
+            }
+        }
+        return false
+    }
+
     interface CallBack {
         val oldBook: Book?
         fun changeTo(source: BookSource, book: Book)

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

@@ -42,21 +42,31 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/tool_bar">
 
+        <FrameLayout
+            android:id="@+id/fl_hide_toc"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:background="@color/background"
+            android:elevation="4dp"
+            app:layout_constraintTop_toTopOf="parent">
+
             <androidx.constraintlayout.utils.widget.ImageFilterView
                 android:id="@+id/iv_hide_toc"
                 android:layout_width="match_parent"
                 android:layout_height="36dp"
                 android:src="@drawable/ic_arrow_down"
-            app:layout_constraintTop_toTopOf="parent"
+                android:background="?android:attr/selectableItemBackground"
                 app:tint="@color/primaryText" />
 
+        </FrameLayout>
+
         <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/recycler_view_toc"
             android:layout_width="match_parent"
             android:layout_height="0dp"
             app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
             app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintTop_toBottomOf="@+id/iv_hide_toc" />
+            app:layout_constraintTop_toBottomOf="@+id/fl_hide_toc" />
 
         <io.legado.app.ui.widget.anima.RotateLoading
             android:id="@+id/loading_toc"