Fix allowBackup deprecated (Android 12+) using dataExtractionRules

See <https://stackoverflow.com/a/71226351>.

Author: yawnoc

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Updated stroke input data to [Conway Stroke Data v1.7.0]
   (adds phrases 較為, 爆煲)
 - Upgraded Android Gradle Plugin to 7.1.3
+- Fixed `allowBackup` deprecated in Android 12+ using `dataExtractionRules`
 
 
 ## [v0.9.10] (32) 奇難雜症 (2022-03-26)

app/src/main/AndroidManifest.xml

@@ -11,6 +11,8 @@
 >
   <application
     android:allowBackup="false"
+    android:fullBackupContent="false"
+    android:dataExtractionRules="@xml/data_extraction_rules"
     android:icon="@mipmap/icon_launcher"
     android:label="@string/app_name"
     android:roundIcon="@mipmap/icon_launcher_round"

app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Exclude everything.
+-->
+<data-extraction-rules>
+  <cloud-backup>
+    <exclude domain="root" />
+    <exclude domain="file" />
+    <exclude domain="database" />
+    <exclude domain="sharedpref" />
+    <exclude domain="external" />
+  </cloud-backup>
+  <device-transfer>
+    <exclude domain="root" />
+    <exclude domain="file" />
+    <exclude domain="database" />
+    <exclude domain="sharedpref" />
+    <exclude domain="external" />
+  </device-transfer>
+</data-extraction-rules>