feat: 优化代码

app/src/main/java/io/legado/app/data/dao/BookDao.kt

@@ -27,6 +27,9 @@ interface BookDao {
     @Query("SELECT * FROM books WHERE (`group` & :group) > 0")
     fun observeByGroup(group: Int): LiveData<List<Book>>
 
+    @Query("select * from books where (SELECT sum(groupId) FROM book_groups) & `group` = 0")
+    fun observeNoGroup(): LiveData<List<Book>>
+
     @Query("SELECT * FROM books WHERE name like '%'||:key||'%' or author like '%'||:key||'%'")
     fun liveDataSearch(key: String): LiveData<List<Book>>
 

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

@@ -100,6 +100,7 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
                 -1 -> App.db.bookDao().observeAll()
                 -2 -> App.db.bookDao().observeLocal()
                 -3 -> App.db.bookDao().observeAudio()
+                -11 -> App.db.bookDao().observeNoGroup()
                 else -> App.db.bookDao().observeByGroup(groupId)
             }
         booksLiveData?.observe(this, Observer {
@@ -112,6 +113,11 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
         when (item.itemId) {
             R.id.menu_group_manage -> GroupManageDialog()
                 .show(supportFragmentManager, "groupManage")
+            R.id.menu_no_group -> {
+                title_bar.subtitle = getString(R.string.no_group)
+                groupId = -11
+                initBookData()
+            }
             R.id.menu_all -> {
                 title_bar.subtitle = item.title
                 groupId = -1

app/src/main/res/menu/arrange_book.xml

@@ -14,6 +14,10 @@
                 android:id="@+id/menu_group_manage"
                 android:title="@string/group_manage" />
 
+            <item
+                android:id="@+id/menu_no_group"
+                android:title="@string/no_group" />
+
             <item
                 android:id="@+id/menu_all"
                 android:title="@string/all" />