up

app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt

@@ -30,7 +30,7 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
         viewModel.loadBook(intent)
         initView()
         savedInstanceState?.let {
-            changeSourceDialog = supportFragmentManager.findFragmentByTag("changeSourceDialog") as? ChangeSourceDialog
+            changeSourceDialog = supportFragmentManager.findFragmentByTag(ChangeSourceDialog.tag) as? ChangeSourceDialog
             changeSourceDialog?.callBack = this
         }
     }
@@ -128,7 +128,7 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
                     changeSourceDialog?.callBack = this
                 }
             }
-            changeSourceDialog?.show(supportFragmentManager, "changeSource")
+            changeSourceDialog?.show(supportFragmentManager, ChangeSourceDialog.tag)
         }
     }
 }

app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt

@@ -16,6 +16,8 @@ import kotlinx.android.synthetic.main.dialog_change_source.*
 class ChangeSourceDialog : DialogFragment() {
 
     companion object {
+        const val tag = "changeSourceDialog"
+
         fun newInstance(name: String, author: String): ChangeSourceDialog {
             val changeSourceDialog = ChangeSourceDialog()
             val bundle = Bundle()