Android indeterminate ProgressBar is not animating

Question

The strange situation I have

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"/>

    <ProgressBar
        android:id="@+id/my_progressBar"
        style="@style/Widget.AppCompat.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:indeterminate="true"/>
</LinearLayout>

And the result is

The ProgressBar is not animating. I'm doing something wrong?

Answer 1

For future searches. It was pretty easy and pretty hard to find the mistake.

Just make sure, that your animations are ENABLED in phone developer options.