up

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

@@ -25,8 +25,20 @@ class MainActivity : BaseActivity<MainViewModel>(), BottomNavigationView.OnNavig
     }
 
     override fun onNavigationItemSelected(item: MenuItem): Boolean {
-
-
+        when (item.itemId) {
+            R.id.menu_bookshelf -> {
+                view_pager_main.currentItem = 0
+            }
+            R.id.menu_find_book -> {
+                view_pager_main.currentItem = 1
+            }
+            R.id.menu_book_source -> {
+                view_pager_main.currentItem = 3
+            }
+            R.id.menu_my_config -> {
+                view_pager_main.currentItem = 4
+            }
+        }
         return false
     }
 

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

@@ -4,19 +4,19 @@
       tools:showIn="bottom_navigation_view">
 
     <item
-            android:id="@+id/nav_backup"
+            android:id="@+id/menu_bookshelf"
             android:icon="@drawable/ic_menu_camera"
             android:title="书架"/>
     <item
-            android:id="@+id/nav_restore"
+            android:id="@+id/menu_find_book"
             android:icon="@drawable/ic_menu_gallery"
             android:title="发现"/>
     <item
-            android:id="@+id/nav_import_old"
+            android:id="@+id/menu_book_source"
             android:icon="@drawable/ic_menu_slideshow"
             android:title="书源"/>
     <item
-            android:id="@+id/nav_import_github"
+            android:id="@+id/menu_my_config"
             android:icon="@drawable/ic_menu_manage"
             android:title="我的"/>