TextView setGravity() doesn't work in java

I'm stuck on a problem and I don't know, what causes it. I have a very simple Layout like this: ``` <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/my_text_view" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_gravity="NOTE_THIS" android:textColor="#FFFFFF" android:textSize="22dp" android:text="TestText"/> </LinearLayout> ``` which is included inside another layout. If I change the gravity inside the xml I see same Result in Layout-Editor and on my phone. If I wanna apply the Gravity programatically like with `myTextView.setGravity(Gravity.CENTER)` it doesn't Change anything. And I cannot set LayoutGravity in Java on a TextView I'll tried for debug purposes to include them three times each with another gravity which does work even. So I assume everything is alright with my Layout and there has to be a Bug or something else I miss. Can someone give me a hint what I also can try, or what causes this problem?