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 93866c856..56d0657ba 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
@@ -131,4 +131,8 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
             changeSourceDialog?.show(supportFragmentManager, ChangeSourceDialog.tag)
         }
     }
+
+    override fun changeTo(book: Book) {
+        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
 }
\ No newline at end of file
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 d81562bf8..bc57ec135 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
@@ -9,6 +9,7 @@ import androidx.appcompat.widget.SearchView
 import androidx.fragment.app.DialogFragment
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.R
+import io.legado.app.data.entities.Book
 import io.legado.app.utils.getViewModel
 import kotlinx.android.synthetic.main.dialog_change_source.*
 
@@ -91,8 +92,8 @@ class ChangeSourceDialog : DialogFragment() {
     }
 
 
-    public interface CallBack {
-
+    interface CallBack {
+        fun changeTo(book: Book)
     }
 
 }
\ No newline at end of file