Up Button Does not Work

Android Programming (3rd Edition) 13. The Toolbar
1

I have added the following code to the manifest and the Up button appears on the tool bar but does not work. Also I have no idea on how to troubleshoot this problem so any hints will help. Thanks in advance!

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.criminalintent">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.CriminalIntent">
        <activity android:name=".CrimeListAcitivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".CrimePagerActivity"
            android:parentActivityName=".CrimeListAcitivity" />

    </application>

</manifest>
2

I see no answers to your question so I may propose that solution as I do not know your support level

<activity
            android:name=".CrimePagerActivity"
            android:parentActivityName=".CrimeListAcitivity"

            <meta-data   
            android:name="android.support.PARENT_ACTIVITY" 
            android:value=".CrimeListAcitivity" />
</activity>

Source : Add an up action  |  Android Developers

Try it or if you found something else while waiting for an answer let us know.