优化

app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt

@@ -162,8 +162,12 @@ class BookSourceActivity : VMBaseActivity<BookSourceViewModel>(R.layout.activity
 
     private fun initViewEvent() {
         cb_selected_all.onClick {
+            if (adapter.getSelection().size == adapter.getActualItemCount()) {
+                adapter.revertSelection()
+            } else {
                 adapter.selectAll()
             }
+        }
         btn_revert_selection.onClick {
             adapter.revertSelection()
         }