Unknown attribute android:fullBackupContent

Question

I am trying to implement the backup functionality for my app, but I am running into the following problem:

• android studio tells me to set the android:fullBackupContent attribute
• when I set this it tells me that the attribute is not recognized

Here is how I have done above in the manifest xml file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.balla.popoint">
    <application
        android:allowBackup="true"
        android:fullBackupContent="@res/xml/backup_rules.xml"
        android:icon="@mipmap/app_icon"
        android:label="@string/app_name"
        android:theme="@style/PoPointTheme"
        tools:ignore="GoogleAppIndexingWarning">

This is how the backup_rules.xml file looks like:

<full-backup-content>
    <include domain="sharedpref" path="."/>
    <include domain="root" path="./somefilename"/>
</full-backup-content>`

The warning that I get is this:

Unknown attribute android:fullBackupContent
Inspection info: This inspection highlights unknown XML attributes in Android resource files and AndroidManifest.xml

Why is this warning displayed? What am I doing wrong?

Answer 1

Change android:fullBackupContent="@res/xml/backup_rules.xml" to android:fullBackupContent="@xml/backup_rules" Also make sure the syntax of your file agrees with the following:

<full-backup-content>
    <include domain=["file" | "database" | "sharedpref" | "external" | "root"]
    path="string"
    requiredFlags=["clientSideEncryption" | "deviceToDeviceTransfer"] />
    <exclude domain=["file" | "database" | "sharedpref" | "external" | "root"]
    path="string" />
</full-backup-content>

source

Answer 2

 android:fullBackupContent="@xml/backup_descriptor

Delete this line from your manifest file