Android circular indeterminate spinner progress bar

drawable/circular_spinner.xml, this xml defines the circular rotation animation on a spinner icon. Change the doDegrees and duration to control the speed of the spinning.

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/spinner"
    android:interpolator="@android:anim/linear_interpolator"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:repeatCount="infinite"
    android:toDegrees="3600"
    android:duration="1000"/>

activity_main.xml, this is a layout xml file with an indeterminate ProgressBar in the center. It uses the above drawable/circular_spinner.xml as the value of android:indeterminateDrawable

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_centerInParent="true"
        android:indeterminateDrawable="@drawable/circular_spinner" >
    </ProgressBar>

</RelativeLayout>

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