In Xamarin Forms Android run, what is this "error APT1000: Found tag id where item is expected"?

Question

I am getting this error in a Xamarin.Forms' Android project when run.

Emulator pixel_3a_xl_q_10_0_-_api_29 is running.
1>E:\XPA\my_solution\my_project\my_project.Android\obj\Debug\100\lp\68\jl\res\values\values.xml(4): error APT1000: Found tag id where item is expected

The contents of that file are:

<?xml version="1.0" encoding="utf-8"?>
<resources>
<id name="view_tree_saved_state_registry_owner"/>
</resources>

I don't find this file in another project that was also targeting Android 10.

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

You can try to enable aapt2 on your Android project, then Clean and rebuild your project. Just as follows:

Update

I found there are two application tags in your AndroidManifest.xml file, try to remove one.
When I changed your code into the following code, it could run properly on my device.
The whole AndroidManifest.xml is :

    <?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.esmsmartsolutions.ToDoPlus" android:installLocation="auto">  
	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29" />  
<application android:label="ToDoPlus" android:theme="@style/MainTheme"></application>  
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  
	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />  
	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  
	<uses-permission android:name="android.permission.READ_CONTACTS" />  
	<uses-permission android:name="android.permission.CALL_PHONE" />  
	<uses-permission android:name="android.permission.INTERNET" />  
	<!--<application android:label="ToDoPlus">  
		<activity android:name="microsoft.identity.client.BrowserTabActivity">  
			<intent-filter>  
				<action android:name="android.intent.action.VIEW" />  
				<category android:name="android.intent.category.DEFAULT" />  
				<category android:name="android.intent.category.BROWSABLE" />  
				<data android:scheme="msauth" android:host="com.esmsmartsolutions.ToDoPlus" />  
			</intent-filter>  
		</activity>  
	</application>-->  
</manifest>  

The result is:

Note:I noticed you haven't include some classes into your app( Models and Services).

Best Regards,

Jessie Zhang

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