feat: 下载界面添加分组

app/src/main/java/io/legado/app/data/entities/Book.kt

@@ -56,10 +56,14 @@ data class Book(
         return origin == BookType.local
     }
 
-    fun isTxt(): Boolean {
+    fun isLocalTxt(): Boolean {
         return isLocalBook() && originName.endsWith(".txt", true)
     }
 
+    fun isOnLineTxt(): Boolean {
+        return !isLocalBook() && type == 0
+    }
+
     override fun equals(other: Any?): Boolean {
         if (other is Book) {
             return other.bookUrl == bookUrl

app/src/main/java/io/legado/app/model/localBook/LocalBook.kt

@@ -47,7 +47,7 @@ object LocalBook {
 
     fun deleteBook(book: Book, deleteOriginal: Boolean) {
         kotlin.runCatching {
-            if (book.isTxt()) {
+            if (book.isLocalTxt()) {
                 val bookFile = FileUtils.getFile(AnalyzeTxtFile.cacheFolder, book.originName)
                 bookFile.delete()
             }

app/src/main/java/io/legado/app/ui/book/download/DownloadActivity.kt

@@ -125,7 +125,7 @@ class DownloadActivity : VMBaseActivity<DownloadViewModel>(R.layout.activity_dow
         }
         booksLiveData?.observe(this, Observer { list ->
             val booksDownload = list.filter {
-                !it.isLocalBook() && it.isTxt()
+                it.isOnLineTxt()
             }
             val books = when (getPrefInt(PreferKey.bookshelfSort)) {
                 1 -> booksDownload.sortedByDescending { it.latestChapterTime }

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -198,7 +198,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
                     when (item.groupId) {
                         R.id.menu_group_on_line -> item.isVisible = onLine
                         R.id.menu_group_local -> item.isVisible = !onLine
-                        R.id.menu_group_text -> item.isVisible = book.isTxt()
+                        R.id.menu_group_text -> item.isVisible = book.isLocalTxt()
                         R.id.menu_group_login ->
                             item.isVisible = !ReadBook.webBook?.bookSource?.loginUrl.isNullOrEmpty()
                         else -> if (item.itemId == R.id.menu_enable_replace) {