优化

app/src/main/java/io/legado/app/ui/book/arrange/ArrangeBookActivity.kt

@@ -66,6 +66,13 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
                 }
             }.show().applyTint()
         }
+        btn_to_group.onClick {
+            if (adapter.selectedBooks.isEmpty()) {
+                toast(R.string.non_select)
+                return@onClick
+            }
+
+        }
     }
 
     private fun initData() {

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

@@ -46,7 +46,7 @@
             tools:ignore="RelativeOverlap" />
 
         <io.legado.app.lib.theme.view.ATEAccentStrokeTextView
-            android:id="@+id/btn_add_group"
+            android:id="@+id/btn_to_group"
             android:layout_width="wrap_content"
             android:layout_height="35dp"
             android:layout_alignParentRight="true"
@@ -63,7 +63,7 @@
             android:layout_marginLeft="10dp"
             android:layout_marginRight="10dp"
             android:gravity="center"
-            android:layout_toLeftOf="@id/btn_add_group"
+            android:layout_toLeftOf="@id/btn_to_group"
             android:text="@string/delete" />
     </RelativeLayout>
 </LinearLayout>