Validates resource references inside Android XML files

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I just created an app without any activity inside and when I add the layout and java class, I started to edit the AndroidManifest.xml to make the intent-filter and add the label and activity stuff. But then it shows me this:

Here's my AndroidManifest.xml :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.arvisapps.practiceapp">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:label="@string/label">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

</application>

Here's the MainActivity.java :

    package com.arvisapps.practiceapp;


public class MainActivity {
}

And my activity_main.xml(I don't think it's needed but anyway):

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</RelativeLayout>

Your MainActivity needs to extend Activity

public class MainActivity extends Activity { }

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go to File and select Invalidate Caches / Restart

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In order to validate a class as activity Your MainActivity.java class must extend to the Activity

public class MainActivity extends Activity{
}

Validates resource references in Android XML files appear at the , Errors are reported as follows 08-31 14:57:45.007 31250-31250/com.klb.frame E/ AndroidRuntime: FATAL EXCEPTION: main Process:� Note: An ID is a simple resource that is referenced using the value provided in the name attribute (not the name of the XML file). As such, you can combine ID resources with other simple resources in the one XML file, under one <resources> element. Also, remember that an ID resources does not reference an actual resource item; it is simply a

Instead of .MainaActivity add packagename.MainActivity

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