feat: 优化代码

app/src/main/java/io/legado/app/ui/download/DownloadViewModel.kt

@@ -3,8 +3,11 @@ package io.legado.app.ui.download
 import android.app.Application
 import android.net.Uri
 import androidx.documentfile.provider.DocumentFile
+import io.legado.app.App
+import io.legado.app.R
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.entities.Book
+import io.legado.app.help.BookHelp
 import io.legado.app.utils.FileUtils
 import io.legado.app.utils.isContentPath
 import java.io.File
@@ -41,4 +44,16 @@ class DownloadViewModel(application: Application) : BaseViewModel(application) {
 
     }
 
+    private fun getAllContents(book: Book): String {
+        val stringBuilder = StringBuilder()
+        stringBuilder.append(book.name)
+            .append("\n")
+            .append(context.getString(R.string.author_show, book.author))
+        App.db.bookChapterDao().getChapterList(book.bookUrl).forEach { chapter ->
+            BookHelp.getContent(book, chapter)?.let {
+                stringBuilder.append("\n").append(it)
+            }
+        }
+        return stringBuilder.toString()
+    }
 }