Android EditText onClick Listener defined in Layout fails with obscure Exception

I want to define an onClick Listener for an EditText in the Layout-XML of may activity, but it always fails with an obscure Exception. This is the relevant part of my layout file:

<ImageView
     android:layout_gravity="center_horizontal|top"
     android:layout_rowSpan="3"
     android:src="@drawable/ic_action_event"
     android:onClick="onCreationClicked"
     />

<EditText
     android:id="@+id/creation_edit"
     android:focusable="false"
     android:clickable="true"
     android:layout_gravity="fill_horizontal"
     android:hint="@string/enter_creation"
     android:onClick="onCreationClicked"
     style="@style/PickerEditText"
     />

When I click on the ImageView the associated method is executed and a DialogFragment is started. When I click on the EditText I get the following Exception:

    java.lang.IllegalStateException: Could not find a method onCreationClicked(View) in the activity class android.support.v7.internal.widget.TintContextWrapper for onClick handler on view class android.support.v7.widget.AppCompatEditText with id 'creation_edit'
            at android.view.View$1.onClick(View.java:3994)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.NoSuchMethodException: onCreationClicked [class android.view.View]
            at java.lang.Class.getMethod(Class.java:664)
            at java.lang.Class.getMethod(Class.java:643)
            at android.view.View$1.onClick(View.java:3987)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

I am currently testing on a Samsung S4 (Android 5.0.1) API 21 and AppCompat Library in Version v7 22.1.0

Any ideas?