默认分组无书籍时自动隐藏

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

@@ -18,16 +18,9 @@ interface BookDao {
     @Query("SELECT * FROM books WHERE origin = '${BookType.local}'")
     fun observeLocal(): LiveData<List<Book>>
 
-    @Query(
-        """
-        select * from books where ((SELECT sum(groupId) FROM book_groups where groupId > 0) & `group`) = 0 and type != ${BookType.audio} and origin != '${BookType.local}'
-    """
-    )
+    @Query("select * from books where ((SELECT sum(groupId) FROM book_groups where groupId > 0) & `group`) = 0 and type != ${BookType.audio} and origin != '${BookType.local}'")
     fun observeNoGroup(): LiveData<List<Book>>
 
-    @Query("select count(bookUrl) from books where (SELECT sum(groupId) FROM book_groups where groupId > 0) & `group` = 0")
-    fun observeNoGroupSize(): LiveData<Int>
-
     @Query("SELECT bookUrl FROM books WHERE origin = '${BookType.local}'")
     fun observeLocalUri(): LiveData<List<String>>
 

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

@@ -2,6 +2,7 @@ package io.legado.app.data.dao
 
 import androidx.lifecycle.LiveData
 import androidx.room.*
+import io.legado.app.constant.BookType
 import io.legado.app.data.entities.BookGroup
 
 @Dao
@@ -16,7 +17,16 @@ interface BookGroupDao {
     @Query("SELECT * FROM book_groups ORDER BY `order`")
     fun liveDataAll(): LiveData<List<BookGroup>>
 
-    @Query("SELECT * FROM book_groups where groupId >= 0 or (groupId < 0 and show > 0) ORDER BY `order`")
+    @Query(
+        """
+        SELECT * FROM book_groups where groupId >= 0 
+        or (groupId = -4 and show > 0 and (select count(bookUrl) from books where ((SELECT sum(groupId) FROM book_groups where groupId > 0) & `group`) = 0 and type != ${BookType.audio} and origin != '${BookType.local}') > 0)
+        or (groupId = -3 and show > 0 and (select count(bookUrl) from books where type = ${BookType.audio}) > 0)
+        or (groupId = -2 and show > 0 and (select count(bookUrl) from books where origin = '${BookType.local}') > 0)
+        or (groupId = -1 and show > 0)
+        ORDER BY `order`
+    """
+    )
     fun liveDataShow(): LiveData<List<BookGroup>>
 
     @Query("SELECT * FROM book_groups where groupId >= 0 ORDER BY `order`")

app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfFragment.kt

@@ -105,11 +105,12 @@ class BookshelfFragment : VMBaseFragment<BookshelfViewModel>(R.layout.fragment_b
 
     private fun initBookGroupData() {
         bookGroupLiveData?.removeObservers(viewLifecycleOwner)
-        bookGroupLiveData = App.db.bookGroupDao().liveDataShow()
-        bookGroupLiveData?.observe(viewLifecycleOwner, {
-            viewModel.checkGroup(it)
-            upGroup(it)
-        })
+        bookGroupLiveData = App.db.bookGroupDao().liveDataShow().apply {
+            observe(viewLifecycleOwner) {
+                viewModel.checkGroup(it)
+                upGroup(it)
+            }
+        }
     }
 
     override fun onQueryTextSubmit(query: String?): Boolean {
@@ -126,10 +127,12 @@ class BookshelfFragment : VMBaseFragment<BookshelfViewModel>(R.layout.fragment_b
         if (data.isEmpty()) {
             App.db.bookGroupDao().enableGroup(AppConst.bookGroupAllId)
         } else {
-            bookGroups.clear()
-            bookGroups.addAll(data)
-            adapter.notifyDataSetChanged()
-            selectLastTab()
+            if (data != bookGroups) {
+                bookGroups.clear()
+                bookGroups.addAll(data)
+                adapter.notifyDataSetChanged()
+                selectLastTab()
+            }
         }
     }
 

app/src/main/java/io/legado/app/ui/main/bookshelf/books/BooksFragment.kt

@@ -107,19 +107,20 @@ class BooksFragment : BaseFragment(R.layout.fragment_books),
             AppConst.bookGroupAudioId -> App.db.bookDao().observeAudio()
             AppConst.bookGroupNoneId -> App.db.bookDao().observeNoGroup()
             else -> App.db.bookDao().observeByGroup(groupId)
-        }
-        bookshelfLiveData?.observe(this, { list ->
-            tv_empty_msg.isGone = list.isNotEmpty()
-            val books = when (getPrefInt(PreferKey.bookshelfSort)) {
-                1 -> list.sortedByDescending { it.latestChapterTime }
-                2 -> list.sortedBy { it.name }
-                3 -> list.sortedBy { it.order }
-                else -> list.sortedByDescending { it.durChapterTime }
+        }.apply {
+            observe(viewLifecycleOwner) { list ->
+                tv_empty_msg.isGone = list.isNotEmpty()
+                val books = when (getPrefInt(PreferKey.bookshelfSort)) {
+                    1 -> list.sortedByDescending { it.latestChapterTime }
+                    2 -> list.sortedBy { it.name }
+                    3 -> list.sortedBy { it.order }
+                    else -> list.sortedByDescending { it.durChapterTime }
+                }
+                val diffResult = DiffUtil
+                    .calculateDiff(BooksDiffCallBack(booksAdapter.getItems(), books))
+                booksAdapter.setItems(books, diffResult)
             }
-            val diffResult = DiffUtil
-                .calculateDiff(BooksDiffCallBack(booksAdapter.getItems(), books))
-            booksAdapter.setItems(books, diffResult)
-        })
+        }
     }
 
     fun getBooks(): List<Book> {