diff --git a/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt b/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt
index ce7ba7b11..31af4fda5 100644
--- a/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt
@@ -50,7 +50,6 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
         initOnClick()
         savedInstanceState?.let {
             changeSourceDialog = supportFragmentManager.findFragmentByTag(ChangeSourceDialog.tag) as? ChangeSourceDialog
-            changeSourceDialog?.callBack = this
         }
     }
 
@@ -178,8 +177,7 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
             if (changeSourceDialog == null) {
                 viewModel.bookData.value?.let {
                     changeSourceDialog = ChangeSourceDialog
-                        .newInstance(it.name, it.author, it.origin)
-                    changeSourceDialog?.callBack = this
+                        .newInstance(it.name, it.author)
                 }
             }
             changeSourceDialog?.show(supportFragmentManager, ChangeSourceDialog.tag)
@@ -216,6 +214,10 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
         }
     }
 
+    override fun curOrigin(): String? {
+        return viewModel.bookData.value?.origin
+    }
+
     override fun oldBook(): Book? {
         return viewModel.bookData.value
     }
diff --git a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt
index 0509ba52e..15e830033 100644
--- a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt
@@ -24,12 +24,11 @@ class ChangeSourceDialog : DialogFragment(),
     companion object {
         const val tag = "changeSourceDialog"
 
-        fun newInstance(name: String, author: String, origin: String): ChangeSourceDialog {
+        fun newInstance(name: String, author: String): ChangeSourceDialog {
             val changeSourceDialog = ChangeSourceDialog()
             val bundle = Bundle()
             bundle.putString("name", name)
             bundle.putString("author", author)
-            bundle.putString("origin", origin)
             changeSourceDialog.arguments = bundle
             return changeSourceDialog
         }
@@ -37,7 +36,6 @@ class ChangeSourceDialog : DialogFragment(),
 
     private lateinit var viewModel: ChangeSourceViewModel
     private lateinit var changeSourceAdapter: ChangeSourceAdapter
-    var callBack: CallBack? = null
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         viewModel = getViewModel(ChangeSourceViewModel::class.java)
@@ -53,9 +51,6 @@ class ChangeSourceDialog : DialogFragment(),
             bundle.getString("author")?.let {
                 viewModel.author = it
             }
-            bundle.getString("origin")?.let {
-                viewModel.curOrigin = it
-            }
         }
         tool_bar.inflateMenu(R.menu.search_view)
         showTitle()
@@ -109,9 +104,10 @@ class ChangeSourceDialog : DialogFragment(),
     }
 
     override fun changeTo(searchBook: SearchBook) {
-        callBack?.let {
+        val activity = activity
+        if (activity is CallBack) {
             val book = searchBook.toBook()
-            it.oldBook()?.let { oldBook ->
+            activity.oldBook()?.let { oldBook ->
                 book.durChapterIndex = oldBook.durChapterIndex
                 book.durChapterPos = oldBook.durChapterPos
                 book.durChapterTitle = oldBook.durChapterTitle
@@ -122,13 +118,17 @@ class ChangeSourceDialog : DialogFragment(),
                     book.coverUrl = oldBook.getDisplayCover()
                 }
             }
-            it.changeTo(book)
+            activity.changeTo(book)
         }
         dismiss()
     }
 
     override fun curOrigin(): String {
-        return viewModel.curOrigin
+        val activity = activity
+        if (activity is CallBack) {
+            return activity.curOrigin() ?: ""
+        }
+        return ""
     }
 
     override fun adapter(): ChangeSourceAdapter {
@@ -136,6 +136,7 @@ class ChangeSourceDialog : DialogFragment(),
     }
 
     interface CallBack {
+        fun curOrigin(): String?
         fun oldBook(): Book?
         fun changeTo(book: Book)
     }
diff --git a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
index acfba1ce3..fc096de5f 100644
--- a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
@@ -16,7 +16,6 @@ import org.jetbrains.anko.debug
 
 class ChangeSourceViewModel(application: Application) : BaseViewModel(application) {
     var callBack: CallBack? = null
-    var curOrigin = ""
     var name: String = ""
     var author: String = ""
     var screenKey: String = ""
diff --git a/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
index 6bd81c895..d7507a57c 100644
--- a/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
@@ -65,7 +65,6 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
         savedInstanceState?.let {
             changeSourceDialog =
                 supportFragmentManager.findFragmentByTag(ChangeSourceDialog.tag) as? ChangeSourceDialog
-            changeSourceDialog?.callBack = this
         }
         setScreenBrightness(getPrefInt("brightness", 100))
     }
@@ -182,8 +181,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
                 if (changeSourceDialog == null) {
                     viewModel.bookData.value?.let {
                         changeSourceDialog = ChangeSourceDialog
-                            .newInstance(it.name, it.author, it.origin)
-                        changeSourceDialog?.callBack = this
+                            .newInstance(it.name, it.author)
                     }
                 }
                 changeSourceDialog?.show(supportFragmentManager, ChangeSourceDialog.tag)
@@ -305,6 +303,10 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
         return viewModel.chapterSize
     }
 
+    override fun curOrigin(): String? {
+        return viewModel.bookData.value?.origin
+    }
+
     override fun oldBook(): Book? {
         return viewModel.bookData.value
     }