Add dataExtractionRules to suppress allowBackup deprecation warning and ensure compatibility with Android 12+ backup policies

[XDdevv]

🎯 Goal

This PR resolves the deprecation warning for android:allowBackup attribute that appears when targeting Android 12+ (API 31+). The warning indicates that android:allowBackup is deprecated and may be removed in future Android versions, requiring the use of android:dataExtractionRules for proper backup policy configuration.

Warning resolved:

The attribute android:allowBackup is deprecated from Android 12 and higher and may be removed in future versions. Consider adding the attribute android:dataExtractionRules specifying an @xml resource which configures cloud backups and device transfers on Android 12 and higher

🛠 Implementation details

• Added res/xml/no_backup.xml file defining data extraction rules that disable all backup operations
• Updated AndroidManifest.xml to include android:dataExtractionRules="@xml/no_backup" attribute
• Maintained existing backup policy (disabled) while ensuring compatibility with Android 12+ requirements
• Preserved all existing manifest attributes for backward compatibility

The implementation uses explicit exclusion rules for all backup domains:

• cloud-backup: Prevents data backup to Google Drive
• device-transfer: Prevents data transfer during device migration
• Excludes all domains: root, file, database, sharedpref, external

✍️ Explain examples

File Structure:

app/src/main/res/xml/no_backup.xml (NEW)
app/src/main/AndroidManifest.xml (MODIFIED)

AndroidManifest.xml changes:

<application
    android:name=".PokedexApp"
    android:allowBackup="false"
    android:fullBackupContent="false" <!-- Added this line -->
    android:dataExtractionRules="@xml/no_backup"  <!-- Added this line -->
    android:enableOnBackInvokedCallback="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/Theme.PokedexCompose"
    tools:ignore="AllowBackup">

res/xml/no_backup.xml (new file):

<?xml version="1.0" encoding="utf-8"?>
<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>

This change:

• ✅ Eliminates the deprecation warning
• ✅ Maintains current backup behavior (disabled)
• ✅ Ensures future Android version compatibility
• ✅ Follows Android 12+ best practices for backup configuration

[skydoves]

Looks good to me :)