gistfile1.txt

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="blah" >
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".HomeScreen"
            android:label="@string/app_name" >

        </activity>
        <activity
            android:name=".QuestHome"
            android:label="@string/title_activity_quest_home"
            android:parentActivityName=".HomeScreen">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="blah.HomeScreen" />
        </activity>
        <activity
            android:name=".blah.CreateAQuest"
            android:label="@string/title_activity_create_aquest"
             >
        </activity>
    </application>

</manifest>

gistfile2.java

public class QuestHome extends ActionBarActivity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_quest_home);
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null)
        {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_quest_home, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings)
        {
            return true;
        }
        switch (item.getItemId())
        {
            // Respond to the action bar's Up/Home button
            case android.R.id.home:
                Intent upIntent = NavUtils.getParentActivityIntent(this);
                if (NavUtils.shouldUpRecreateTask(this, upIntent))
                {
                    // This activity is NOT part of this app's task, so create a new task
                    // when navigating up, with a synthesized back stack.
                    TaskStackBuilder.create(this)
                            // Add all of this activity's parents to the back stack
                            .addNextIntentWithParentStack(upIntent)
                                    // Navigate up to the closest parent
                            .startActivities();
                }
                else
                {
                    // This activity is part of this app's task, so simply
                    // navigate up to the logical parent activity.
                    NavUtils.navigateUpTo(this, upIntent);
                }
                return true;
        }

        return super.onOptionsItemSelected(item);
    }
}