优化

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

@@ -30,12 +30,21 @@
 
         <io.legado.app.lib.theme.view.ATECheckBox
             android:id="@+id/cb_selected_all"
-            android:layout_width="120dp"
+            android:layout_width="wrap_content"
             android:layout_height="40dp"
             android:layout_centerVertical="true"
             android:text="@string/select_all"
             android:textColor="@color/tv_text_default" />
 
+        <TextView
+            android:id="@+id/tv_select_count"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_centerVertical="true"
+            android:text="@string/select_count"
+            android:layout_toRightOf="@+id/cb_selected_all"
+            tools:ignore="RelativeOverlap" />
+
         <io.legado.app.lib.theme.view.ATEAccentStrokeTextView
             android:id="@+id/btn_add_group"
             android:layout_width="wrap_content"

app/src/main/res/values/strings.xml

@@ -591,5 +591,6 @@
     <string name="auto_dark_mode_s">夜间模式跟随系统</string>
     <string name="go_back">上级</string>
     <string name="tone_colour">在线朗读音色</string>
+    <string name="select_count">(%d/%d)</string>
 
 </resources>