优化

app/src/main/java/io/legado/app/base/BaseViewModel.kt

@@ -27,6 +27,15 @@ open class BaseViewModel(application: Application) : AndroidViewModel(applicatio
         return Coroutine.async(scope, context, start, executeContext, block)
     }
 
+    fun <T> executeLazy(
+        scope: CoroutineScope = viewModelScope,
+        context: CoroutineContext = Dispatchers.IO,
+        executeContext: CoroutineContext = Dispatchers.Main,
+        block: suspend CoroutineScope.() -> T
+    ): Coroutine<T> {
+        return Coroutine.async(scope, context, CoroutineStart.LAZY, executeContext, block)
+    }
+
     fun <R> submit(
         scope: CoroutineScope = viewModelScope,
         context: CoroutineContext = Dispatchers.IO,

app/src/main/java/io/legado/app/help/book/ContentProcessor.kt

@@ -188,6 +188,7 @@ class ContentProcessor private constructor(
             mContent = mContent.replace('\u00A0', ' ')
         }
         val contents = arrayListOf<String>()
+        val paragraphIndent = ReadBookConfig.paragraphIndent
         mContent.split("\n").forEach { str ->
             val paragraph = str.trim {
                 it.code <= 0x20 || it == '　'
@@ -196,10 +197,14 @@ class ContentProcessor private constructor(
                 if (contents.isEmpty() && includeTitle) {
                     contents.add(paragraph)
                 } else {
-                    contents.add("${ReadBookConfig.paragraphIndent}$paragraph")
+                    contents.add("$paragraphIndent$paragraph")
                 }
             }
         }
+        if (contents.isEmpty()) {
+            contents.add("${paragraphIndent}加载正文失败")
+            contents.add("${paragraphIndent}内容处理后为空")
+        }
         return BookContent(sameTitleRemoved, contents, effectiveReplaceRules)
     }
 

app/src/main/java/io/legado/app/ui/book/import/remote/RemoteBookActivity.kt

@@ -170,7 +170,11 @@ class RemoteBookActivity : BaseImportBookActivity<RemoteBookViewModel>(),
 
     private fun upPath() {
         binding.tvGoBack.isEnabled = viewModel.dirList.isNotEmpty()
-        var path = "books" + File.separator
+        var path = if (viewModel.isDefaultWebdav) {
+            "books" + File.separator
+        } else {
+            File.separator
+        }
         viewModel.dirList.forEach {
             path = path + it.filename + File.separator
         }

app/src/main/java/io/legado/app/ui/book/import/remote/RemoteBookViewModel.kt

@@ -90,14 +90,17 @@ class RemoteBookViewModel(application: Application) : BaseViewModel(application)
     }.flowOn(Dispatchers.IO)
 
     private var remoteBookWebDav: RemoteBookWebDav? = null
+    var isDefaultWebdav = false
 
     fun initData(onSuccess: () -> Unit) {
         execute {
+            isDefaultWebdav = false
             appDb.serverDao.get(AppConfig.remoteServerId)?.getWebDavConfig()?.let {
                 val authorization = Authorization(it)
                 remoteBookWebDav = RemoteBookWebDav(it.url, authorization, AppConfig.remoteServerId)
                 return@execute
             }
+            isDefaultWebdav = true
             remoteBookWebDav = AppWebDav.defaultBookWebDav
                 ?: throw NoStackTraceException("webDav没有配置")
         }.onError {
@@ -108,7 +111,7 @@ class RemoteBookViewModel(application: Application) : BaseViewModel(application)
     }
 
     fun loadRemoteBookList(path: String?, loadCallback: (loading: Boolean) -> Unit) {
-        execute {
+        executeLazy {
             val bookWebDav = remoteBookWebDav
                 ?: throw NoStackTraceException("没有配置webDav")
             dataCallback?.clear()
@@ -122,7 +125,7 @@ class RemoteBookViewModel(application: Application) : BaseViewModel(application)
             loadCallback.invoke(true)
         }.onFinally {
             loadCallback.invoke(false)
-        }
+        }.start()
     }
 
     fun addToBookshelf(remoteBooks: HashSet<RemoteBook>, finally: () -> Unit) {

app/src/main/java/io/legado/app/ui/book/read/page/delegate/ScrollPageDelegate.kt

@@ -154,8 +154,8 @@ class ScrollPageDelegate(readView: ReadView) : PageDelegate(readView) {
      */
     private fun calcNextPageOffset(): Int {
         val visibleHeight = ChapterProvider.visibleHeight
-        val book = ReadBook.book!!
+        val book = ReadBook.book
-        if (book.isImage) {
+        if (book == null || book.isImage) {
             return -visibleHeight
         }
         val visiblePage = readView.getCurVisiblePage()
@@ -170,8 +170,8 @@ class ScrollPageDelegate(readView: ReadView) : PageDelegate(readView) {
 
     private fun calcPrevPageOffset(): Int {
         val visibleHeight = ChapterProvider.visibleHeight
-        val book = ReadBook.book!!
+        val book = ReadBook.book
-        if (book.isImage) {
+        if (book == null || book.isImage) {
             return visibleHeight
         }
         val visiblePage = readView.getCurVisiblePage()