<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center">
    <ProgressBar
        android:id="@+id/ab_pb"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_marginLeft="12dp"
        android:layout_marginRight="12dp"
        android:layout_gravity="center"
        android:indeterminate="true" />
</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center">
    <ProgressBar
        android:id="@+id/ab_pb"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_marginLeft="12dp"
        android:layout_marginRight="12dp"
        android:layout_gravity="center"
        android:indeterminate="true"
        android:theme="@style/Theme.Header" />
</FrameLayout>

Fix action bar loading indicator on Android L.
Fix action bar loading indicator on Android L.
