diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 865feb29f..0a1261a13 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -54,7 +54,7 @@
         <activity android:name=".ui.bookinfo.BookInfoEditActivity" />
         <activity android:name=".ui.sourcedebug.SourceDebugActivity" />
         <activity android:name=".ui.booksource.BookSourceActivity" />
-        <activity android:name=".ui.read.ReadActivity" />
+        <activity android:name=".ui.readbook.ReadBookActivity" />
         <activity android:name=".ui.chapterlist.ChapterListActivity" />
 
         <service android:name=".service.CheckSourceService" />
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 56d0657ba..92e5c15c3 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
@@ -21,7 +21,7 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
     override val viewModel: BookInfoViewModel
         get() = getViewModel(BookInfoViewModel::class.java)
 
-    var changeSourceDialog: ChangeSourceDialog? = null
+    private var changeSourceDialog: ChangeSourceDialog? = null
 
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         setSupportActionBar(toolbar)
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfFragment.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfFragment.kt
index 8ed1d310b..92a405b4c 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfFragment.kt
@@ -26,7 +26,7 @@ import io.legado.app.lib.theme.ATH
 import io.legado.app.lib.theme.accentColor
 import io.legado.app.ui.bookinfo.BookInfoActivity
 import io.legado.app.ui.bookshelf.BookshelfActivity
-import io.legado.app.ui.read.ReadActivity
+import io.legado.app.ui.readbook.ReadBookActivity
 import io.legado.app.ui.search.SearchActivity
 import io.legado.app.utils.*
 import kotlinx.android.synthetic.main.dialog_edittext.view.*
@@ -106,7 +106,7 @@ class BookshelfFragment : VMBaseFragment<BookshelfViewModel>(R.layout.fragment_b
     }
 
     override fun open(book: Book) {
-        context?.startActivity<ReadActivity>(Pair("bookUrl", book.bookUrl))
+        context?.startActivity<ReadBookActivity>(Pair("bookUrl", book.bookUrl))
     }
 
     override fun openBookInfo(book: Book) {
diff --git a/app/src/main/java/io/legado/app/ui/read/ReadActivity.kt b/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
similarity index 80%
rename from app/src/main/java/io/legado/app/ui/read/ReadActivity.kt
rename to app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
index ed29d2692..96857f8cf 100644
--- a/app/src/main/java/io/legado/app/ui/read/ReadActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
@@ -1,4 +1,4 @@
-package io.legado.app.ui.read
+package io.legado.app.ui.readbook
 
 import android.os.Bundle
 import android.view.KeyEvent
@@ -10,6 +10,8 @@ import androidx.core.view.isVisible
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
+import io.legado.app.data.entities.Book
+import io.legado.app.ui.changesource.ChangeSourceDialog
 import io.legado.app.ui.chapterlist.ChapterListActivity
 import io.legado.app.ui.replacerule.ReplaceRuleActivity
 import io.legado.app.utils.*
@@ -18,10 +20,11 @@ import kotlinx.android.synthetic.main.view_title_bar.*
 import org.jetbrains.anko.sdk27.listeners.onClick
 import org.jetbrains.anko.startActivity
 
-class ReadActivity : VMBaseActivity<ReadViewModel>(R.layout.activity_read) {
-    override val viewModel: ReadViewModel
-        get() = getViewModel(ReadViewModel::class.java)
+class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_read), ChangeSourceDialog.CallBack {
+    override val viewModel: ReadBookViewModel
+        get() = getViewModel(ReadBookViewModel::class.java)
 
+    private var changeSourceDialog: ChangeSourceDialog? = null
     private var menuBarShow: Boolean = false
     private lateinit var menuTopIn: Animation
     private lateinit var menuTopOut: Animation
@@ -33,6 +36,10 @@ class ReadActivity : VMBaseActivity<ReadViewModel>(R.layout.activity_read) {
         initAnimation()
         initView()
         viewModel.initData(intent)
+        savedInstanceState?.let {
+            changeSourceDialog = supportFragmentManager.findFragmentByTag(ChangeSourceDialog.tag) as? ChangeSourceDialog
+            changeSourceDialog?.callBack = this
+        }
     }
 
     private fun initAnimation() {
@@ -129,7 +136,7 @@ class ReadActivity : VMBaseActivity<ReadViewModel>(R.layout.activity_read) {
             }
 
             override fun toast(id: Int) {
-                this@ReadActivity.toast(id)
+                this@ReadBookActivity.toast(id)
             }
 
             override fun dismiss() {
@@ -146,7 +153,15 @@ class ReadActivity : VMBaseActivity<ReadViewModel>(R.layout.activity_read) {
 
     override fun onCompatOptionsItemSelected(item: MenuItem): Boolean {
         when (item.itemId) {
-
+            R.id.menu_change_source -> {
+                if (changeSourceDialog == null) {
+                    viewModel.book?.let {
+                        changeSourceDialog = ChangeSourceDialog.newInstance(it.name, it.author)
+                        changeSourceDialog?.callBack = this
+                    }
+                }
+                changeSourceDialog?.show(supportFragmentManager, ChangeSourceDialog.tag)
+            }
         }
         return super.onCompatOptionsItemSelected(item)
     }
@@ -185,4 +200,8 @@ class ReadActivity : VMBaseActivity<ReadViewModel>(R.layout.activity_read) {
             }
         }
     }
+
+    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/read/ReadViewModel.kt b/app/src/main/java/io/legado/app/ui/readbook/ReadBookViewModel.kt
similarity index 92%
rename from app/src/main/java/io/legado/app/ui/read/ReadViewModel.kt
rename to app/src/main/java/io/legado/app/ui/readbook/ReadBookViewModel.kt
index 3d0cc0b59..d793c0cb0 100644
--- a/app/src/main/java/io/legado/app/ui/read/ReadViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/readbook/ReadBookViewModel.kt
@@ -1,4 +1,4 @@
-package io.legado.app.ui.read
+package io.legado.app.ui.readbook
 
 import android.app.Application
 import android.content.Intent
@@ -9,7 +9,7 @@ import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookSource
 import io.legado.app.model.WebBook
 
-class ReadViewModel(application: Application) : BaseViewModel(application) {
+class ReadBookViewModel(application: Application) : BaseViewModel(application) {
 
     var book: Book? = null
     var bookSource: BookSource? = null
diff --git a/app/src/main/java/io/legado/app/ui/read/ReadBottomMenu.kt b/app/src/main/java/io/legado/app/ui/readbook/ReadBottomMenu.kt
similarity index 99%
rename from app/src/main/java/io/legado/app/ui/read/ReadBottomMenu.kt
rename to app/src/main/java/io/legado/app/ui/readbook/ReadBottomMenu.kt
index 196d86e9d..ba13a07aa 100644
--- a/app/src/main/java/io/legado/app/ui/read/ReadBottomMenu.kt
+++ b/app/src/main/java/io/legado/app/ui/readbook/ReadBottomMenu.kt
@@ -1,4 +1,4 @@
-package io.legado.app.ui.read
+package io.legado.app.ui.readbook
 
 import android.content.Context
 import android.util.AttributeSet
diff --git a/app/src/main/res/layout/activity_read.xml b/app/src/main/res/layout/activity_read.xml
index a7396af3d..e59480522 100644
--- a/app/src/main/res/layout/activity_read.xml
+++ b/app/src/main/res/layout/activity_read.xml
@@ -46,7 +46,7 @@
 
         </io.legado.app.ui.widget.TitleBar>
 
-        <io.legado.app.ui.read.ReadBottomMenu
+        <io.legado.app.ui.readbook.ReadBottomMenu
             android:id="@+id/bottom_menu"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
diff --git a/app/src/main/res/menu/read_book.xml b/app/src/main/res/menu/read_book.xml
index b141dc68d..f6b5a1bb4 100644
--- a/app/src/main/res/menu/read_book.xml
+++ b/app/src/main/res/menu/read_book.xml
@@ -5,64 +5,64 @@
 
     <group android:id="@+id/menuOnLine">
         <item
-            android:id="@+id/action_change_source"
+            android:id="@+id/menu_change_source"
             android:icon="@drawable/ic_exchange"
             android:title="@string/change_origin"
             app:showAsAction="always" />
 
         <item
-            android:id="@+id/action_refresh"
+            android:id="@+id/menu_refresh"
             android:icon="@drawable/ic_refresh_black_24dp"
             android:title="@string/refresh"
             app:showAsAction="ifRoom" />
 
         <item
-            android:id="@+id/action_download"
+            android:id="@+id/menu_download"
             android:icon="@drawable/ic_download_line"
             android:title="@string/download_offline"
             app:showAsAction="ifRoom" />
 
         <item
-            android:id="@+id/disable_book_source"
+            android:id="@+id/menu_disable_book_source"
             android:icon="@drawable/ic_cancel"
             android:title="@string/disable_book_source"
             app:showAsAction="never" />
 
     </group>
 
-    <group android:id="@+id/menu_text">
+    <group android:id="@+id/menu_group_text">
         <item
-            android:id="@+id/action_set_regex"
+            android:id="@+id/menu_set_regex"
             android:icon="@drawable/ic_exchange"
             android:title="@string/txt_chapter_regex"
             app:showAsAction="always" />
     </group>
 
-    <group android:id="@+id/menuLocal">
+    <group android:id="@+id/menu_group_local">
 
         <item
-            android:id="@+id/action_set_charset"
+            android:id="@+id/menu_set_charset"
             android:icon="@drawable/ic_translate"
             android:title="@string/set_charset"
             app:showAsAction="ifRoom" />
 
     </group>
 
-    <group android:id="@+id/menuShow">
+    <group android:id="@+id/menu_group_show">
         <item
-            android:id="@+id/add_bookmark"
+            android:id="@+id/menu_add_bookmark"
             android:icon="@drawable/ic_bookmark"
             android:title="@string/bookmark_add"
             app:showAsAction="ifRoom" />
 
         <item
-            android:id="@+id/action_copy_text"
+            android:id="@+id/menu_copy_text"
             android:icon="@drawable/ic_copy"
             android:title="@string/copy_text"
             app:showAsAction="ifRoom" />
 
         <item
-            android:id="@+id/enable_replace"
+            android:id="@+id/menu_enable_replace"
             android:icon="@drawable/ic_find_replace"
             android:title="@string/replace_rule_title"
             android:checkable="true"
@@ -70,21 +70,21 @@
             app:showAsAction="never" />
 
         <item
-            android:id="@+id/update_chapter_list"
+            android:id="@+id/menu_update_chapter_list"
             android:icon="@drawable/ic_update"
             android:title="@string/update_chapter"
             app:showAsAction="never" />
 
         <item
-            android:id="@+id/action_book_info"
+            android:id="@+id/menu_book_info"
             android:icon="@drawable/ic_toc"
             android:title="@string/book_info"
             app:showAsAction="never" />
     </group>
 
-    <group android:id="@+id/menu_login">
+    <group android:id="@+id/menu_group_login">
         <item
-            android:id="@+id/action_login"
+            android:id="@+id/menu_login"
             android:icon="@drawable/ic_toc"
             android:title="@string/login"
             app:showAsAction="never" />
diff --git a/app/src/main/res/menu/source_edit.xml b/app/src/main/res/menu/source_edit.xml
index f9831f9a4..f1ee15173 100644
--- a/app/src/main/res/menu/source_edit.xml
+++ b/app/src/main/res/menu/source_edit.xml
@@ -15,7 +15,7 @@
         app:showAsAction="ifRoom" />
 
     <item
-        android:id="@+id/action_login"
+        android:id="@+id/menu_login"
         android:title="@string/login"
         app:showAsAction="never" />