优化

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

@@ -14,6 +14,7 @@ import io.legado.app.data.entities.BookGroup
 import io.legado.app.lib.theme.ATH
 import io.legado.app.utils.getViewModel
 import kotlinx.android.synthetic.main.activity_arrange_book.*
+import org.jetbrains.anko.sdk27.listeners.onClick
 
 
 class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activity_arrange_book),
@@ -47,6 +48,9 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
         recycler_view.layoutManager = LinearLayoutManager(this)
         adapter = ArrangeBookAdapter(this, this)
         recycler_view.adapter = adapter
+        cb_selected_all.onClick {
+            adapter.selectAll(cb_selected_all.isChecked)
+        }
     }
 
     private fun initData() {

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

@@ -13,7 +13,21 @@ import org.jetbrains.anko.sdk27.listeners.onClick
 class ArrangeBookAdapter(context: Context, val callBack: CallBack) :
     SimpleRecyclerAdapter<Book>(context, R.layout.item_arrange_book) {
 
-    val selectedBooks: ArrayList<String> = arrayListOf()
+    val selectedBooks: HashSet<String> = hashSetOf()
+
+    fun selectAll(selectAll: Boolean) {
+        if (selectAll) {
+            selectedBooks.clear()
+            notifyDataSetChanged()
+            callBack.upSelectCount()
+        } else {
+            getItems().forEach {
+                selectedBooks.add(it.bookUrl)
+            }
+            notifyDataSetChanged()
+            callBack.upSelectCount()
+        }
+    }
 
     override fun convert(holder: ItemViewHolder, item: Book, payloads: MutableList<Any>) {
         with(holder.itemView) {