优化

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

@@ -49,7 +49,7 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
         adapter = ArrangeBookAdapter(this, this)
         recycler_view.adapter = adapter
         cb_selected_all.onClick {
-            adapter.selectAll(cb_selected_all.isChecked)
+            adapter.selectAll(!adapter.isSelectAll())
         }
     }
 
@@ -70,11 +70,7 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
     }
 
     override fun upSelectCount() {
-        if (adapter.selectedBooks.size == 0) {
-            cb_selected_all.isChecked = false
-        } else {
-            cb_selected_all.isChecked = adapter.selectedBooks.size >= adapter.getItems().size
-        }
+        cb_selected_all.isChecked = adapter.isSelectAll()
         //重置全选的文字
         if (cb_selected_all.isChecked) {
             cb_selected_all.setText(R.string.cancel)

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

@@ -15,17 +15,25 @@ class ArrangeBookAdapter(context: Context, val callBack: CallBack) :
 
     val selectedBooks: HashSet<String> = hashSetOf()
 
+    fun isSelectAll(): Boolean {
+        return if (selectedBooks.isEmpty()) {
+            false
+        } else {
+            selectedBooks.size >= itemCount
+        }
+    }
+
     fun selectAll(selectAll: Boolean) {
         if (selectAll) {
-            selectedBooks.clear()
-            notifyDataSetChanged()
-            callBack.upSelectCount()
-        } else {
             getItems().forEach {
                 selectedBooks.add(it.bookUrl)
             }
             notifyDataSetChanged()
             callBack.upSelectCount()
+        } else {
+            selectedBooks.clear()
+            notifyDataSetChanged()
+            callBack.upSelectCount()
         }
     }