diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index f988cad4e..da94ce43d 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -356,6 +356,8 @@
                 <data android:mimeType="application/json" />
                 <!-- EPUB -->
                 <data android:mimeType="application/epub+zip" />
+                <!-- pdf -->
+                <data android:mimeType="application/pdf" />
             </intent-filter>
             <!-- Works when an app doesn't know the media type, e.g. Dropbox -->
             <intent-filter>
@@ -372,14 +374,13 @@
                 <!-- This media type is necessary, otherwise it won't match on the file extension -->
                 <data android:mimeType="*/*" />
                 <!--TXT-->
-                <data android:pathPattern=".*\\.txt" />
-                <data android:pathPattern=".*\\.TXT" />
+                <data android:pathAdvancedPattern=".*\\.[tT][xX][tT]" />
                 <!--JSON-->
-                <data android:pathPattern=".*\\.json" />
-                <data android:pathPattern=".*\\.JSON" />
+                <data android:pathAdvancedPattern=".*\\.[jJ][sS][oO][nN]" />
                 <!-- EPUB -->
-                <data android:pathPattern=".*\\.epub" />
-                <data android:pathPattern=".*\\.EPUB" />
+                <data android:pathAdvancedPattern=".*\\.[eE][pP][uU][bB]" />
+                <!-- pdf -->
+                <data android:pathAdvancedPattern=".*\\.[pP][dD][fF]" />
             </intent-filter>
         </activity>
 
diff --git a/app/src/main/java/io/legado/app/model/ReadBook.kt b/app/src/main/java/io/legado/app/model/ReadBook.kt
index 540cc7756..2da67c7c8 100644
--- a/app/src/main/java/io/legado/app/model/ReadBook.kt
+++ b/app/src/main/java/io/legado/app/model/ReadBook.kt
@@ -501,7 +501,7 @@ object ReadBook : CoroutineScope by MainScope() {
     interface CallBack {
         fun upMenuView()
 
-        fun loadChapterList(book: Book, callback: (() -> Unit)? = null)
+        fun loadChapterList(book: Book)
 
         fun upContent(
             relativePosition: Int = 0,
diff --git a/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt b/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
index 877f6ae05..acfdd69ab 100644
--- a/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
@@ -154,7 +154,7 @@ object LocalBook {
         val bookUrl: String
         val updateTime: Long
         //这个变量不要修改,否则会导致读取不到缓存
-        val fileName = (if (uri.isContentScheme()) {
+        val fileName = if (uri.isContentScheme()) {
             bookUrl = uri.toString()
             val doc = DocumentFile.fromSingleUri(appCtx, uri)!!
             updateTime = doc.lastModified()
@@ -164,7 +164,7 @@ object LocalBook {
             val file = File(bookUrl)
             updateTime = file.lastModified()
             file.name
-        })
+        }
         var book = appDb.bookDao.getBook(bookUrl)
         if (book == null) {
             val nameAuthor = analyzeNameAuthor(fileName)
diff --git a/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt b/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt
index cf3b96bd6..bd3e04b41 100644
--- a/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt
@@ -1,6 +1,7 @@
 package io.legado.app.ui.association
 
 import android.net.Uri
+import android.os.Build
 import android.os.Bundle
 import androidx.activity.viewModels
 import androidx.documentfile.provider.DocumentFile
@@ -104,7 +105,9 @@ class FileAssociationActivity :
             }
         }
         intent.data?.let { data ->
-            if (!data.isContentScheme()) {
+            if (data.isContentScheme()) {
+                viewModel.dispatchIndent(data)
+            } else if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.Q) {
                 PermissionsCompat.Builder(this)
                     .addPermissions(*Permissions.Group.STORAGE)
                     .rationale(R.string.tip_perm_request_storage)
@@ -112,7 +115,7 @@ class FileAssociationActivity :
                         viewModel.dispatchIndent(data)
                     }.request()
             } else {
-                viewModel.dispatchIndent(data)
+                toastOnUi("由于安卓系统限制，请使用系统文件管理重新打开。")
             }
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 6b700b8bc..11558542d 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -750,9 +750,9 @@ class ReadBookActivity : BaseReadBookActivity(),
         }
     }
 
-    override fun loadChapterList(book: Book, callback: (() -> Unit)?) {
+    override fun loadChapterList(book: Book) {
         ReadBook.upMsg(getString(R.string.toc_updateing))
-        viewModel.loadChapterList(book, callback)
+        viewModel.loadChapterList(book)
     }
 
     /**
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
index fa2e820c4..aeb31f6fc 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
@@ -134,7 +134,7 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     /**
      * 加载目录
      */
-    fun loadChapterList(book: Book, callback: (() -> Unit)? = null) {
+    fun loadChapterList(book: Book) {
         if (book.isLocal) {
             execute {
                 LocalBook.getChapterList(book).let {
@@ -156,8 +156,6 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
                         ReadBook.upMsg("LoadTocError:${it.localizedMessage}")
                     }
                 }
-            }.onFinally {
-                callback?.invoke()
             }
         } else {
             ReadBook.bookSource?.let {
@@ -177,8 +175,6 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
                         ReadBook.loadContent(resetPageOffset = true)
                     }.onError {
                         ReadBook.upMsg(context.getString(R.string.error_load_toc))
-                    }.onFinally {
-                        callback?.invoke()
                     }
             }
         }