双击发现折叠发现,再次双击滚动至顶端

app/src/main/java/io/legado/app/ui/main/MainActivity.kt

@@ -39,6 +39,7 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
         get() = getViewModel(MainViewModel::class.java)
     private var exitTime: Long = 0
     private var bookshelfReselected: Long = 0
+    private var exploreReselected: Long = 0
     private var pagePosition = 0
     private val fragmentMap = hashMapOf<Int, Fragment>()
 
@@ -72,7 +73,7 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
     override fun onNavigationItemSelected(item: MenuItem): Boolean {
         when (item.itemId) {
             R.id.menu_bookshelf -> view_pager_main.setCurrentItem(0, false)
-            R.id.menu_find_book -> view_pager_main.setCurrentItem(1, false)
+            R.id.menu_explore -> view_pager_main.setCurrentItem(1, false)
             R.id.menu_rss -> view_pager_main.setCurrentItem(2, false)
             R.id.menu_my_config -> view_pager_main.setCurrentItem(3, false)
         }
@@ -88,6 +89,13 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
                     (fragmentMap[0] as? BookshelfFragment)?.gotoTop()
                 }
             }
+            R.id.menu_explore -> {
+                if (System.currentTimeMillis() - exploreReselected > 300) {
+                    exploreReselected = System.currentTimeMillis()
+                } else {
+                    (fragmentMap[1] as? ExploreFragment)?.compressExplore()
+                }
+            }
         }
     }
 

app/src/main/java/io/legado/app/ui/main/explore/ExploreAdapter.kt

@@ -11,7 +11,10 @@ import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.BookSource
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.lib.theme.accentColor
-import io.legado.app.utils.*
+import io.legado.app.utils.ACache
+import io.legado.app.utils.dp
+import io.legado.app.utils.gone
+import io.legado.app.utils.visible
 import kotlinx.android.synthetic.main.item_fillet_text.view.*
 import kotlinx.android.synthetic.main.item_find_book.view.*
 import kotlinx.coroutines.CoroutineScope
@@ -97,6 +100,17 @@ class ExploreAdapter(context: Context, private val scope: CoroutineScope, val ca
         }
     }
 
+    fun compressExplore(): Boolean {
+        return if (exIndex < 0) {
+            false
+        } else {
+            val oldExIndex = exIndex
+            exIndex = -1
+            notifyItemChanged(oldExIndex)
+            true
+        }
+    }
+
     private fun showMenu(view: View, position: Int): Boolean {
         val source = getItem(position) ?: return true
         val popupMenu = PopupMenu(context, view)

app/src/main/java/io/legado/app/ui/main/explore/ExploreFragment.kt

@@ -15,6 +15,7 @@ import io.legado.app.R
 import io.legado.app.base.VMBaseFragment
 import io.legado.app.constant.AppPattern
 import io.legado.app.data.entities.BookSource
+import io.legado.app.help.AppConfig
 import io.legado.app.lib.theme.ATH
 import io.legado.app.lib.theme.primaryTextColor
 import io.legado.app.ui.book.explore.ExploreShowActivity
@@ -154,4 +155,14 @@ class ExploreFragment : VMBaseFragment<ExploreViewModel>(R.layout.fragment_find_
         viewModel.topSource(source)
     }
 
+    fun compressExplore() {
+        if (!adapter.compressExplore()) {
+            if (AppConfig.isEInkMode) {
+                rv_find.scrollToPosition(0)
+            } else {
+                rv_find.smoothScrollToPosition(0)
+            }
+        }
+    }
+
 }

app/src/main/res/menu/main_bnv.xml

@@ -8,7 +8,7 @@
         android:icon="@drawable/ic_bottom_books"
         android:title="@string/bookshelf" />
     <item
-        android:id="@+id/menu_find_book"
+        android:id="@+id/menu_explore"
         android:icon="@drawable/ic_bottom_explore"
         android:title="@string/find" />
     <item