Inflate a new fragment results in an exception

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Android

I'm in the MainActivityFragment and want to call the activity "CountdownActivity" by pressing a button. This works.
But the try and catch returns the following exception while trying to setContentView(R.layout.activity_countdown); :

android.view.InflateException: Binary XML file line #2: Error inflating class fragment

Bellow you find my code, I think this is all whats necessary.


The new Fragment get called this way:

public void Countdown(Integer time){
        Intent CountdownIntent = new Intent(getActivity(),CountdownActivity.class);
        CountdownIntent.putExtra(Intent.EXTRA_TEXT, time);
        startActivity(CountdownIntent);
    }

activity_countdown.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragment_countdown"
    android:name="com.test.app.count.CountdownActivityFragment"
    tools:layout="@layout/fragment_countdown"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

fragment_countdown.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.test.app.count.CountdownActivityFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Countdown"
        android:id="@+id/TextView_showCountdownTime"/>

</FrameLayout>

CountdownActivity.class

public class CountdownActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        try {
            setContentView(R.layout.activity_countdown);
        }
        catch (Exception e){
            Log.e(CountdownActivity.class.getName(), "Exception: " + e);
        }
    }
}

What I have tried:

I get no error when I delete the part with fragment in activity_countdown.xml and e.g. use a RelativeLayout. But it's not what I want