diff --git a/app/src/main/java/io/legado/app/help/storage/Backup.kt b/app/src/main/java/io/legado/app/help/storage/Backup.kt
index 683cf34c1..56bae33eb 100644
--- a/app/src/main/java/io/legado/app/help/storage/Backup.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Backup.kt
@@ -42,6 +42,12 @@ object Backup {
         }
     }
 
+    private fun backupPreference(path: String) {
+        val file = FileHelp.getFile(path + File.separator + "config.xml")
+
+
+    }
+
     private fun backupBookshelf(path: String) {
         val json = GSON.toJson(App.db.bookDao().allBooks)
         val file = FileHelp.getFile(path + File.separator + "bookshelf.json")
diff --git a/app/src/main/java/io/legado/app/utils/ContextExtensions.kt b/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
index 7de826fbb..c51be0b80 100644
--- a/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
@@ -5,12 +5,8 @@ import android.content.res.ColorStateList
 import android.graphics.drawable.Drawable
 import androidx.annotation.ColorRes
 import androidx.annotation.DrawableRes
-import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
 import androidx.core.content.edit
-import androidx.fragment.app.Fragment
-import com.jeremyliao.liveeventbus.LiveEventBus
-import io.legado.app.R
 import org.jetbrains.anko.connectivityManager
 import org.jetbrains.anko.defaultSharedPreferences