update:2021.03.19

fix:重新提交
add:

res/xml/backupscheme.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<full-backup-content xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <include domain="database" path="launcher.db" />
+    <include domain="sharedpref" path="com.android.uiuios.prefs.xml" />
+    <include domain="file" path="downgrade_schema.json" />
+
+</full-backup-content>