[android] How to center a View inside of an Android Layout?

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relLayout1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center">
    <ProgressBar
        android:id="@+id/ProgressBar01"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:layout_height="wrap_content"></ProgressBar>
    <TextView
        android:layout_below="@id/ProgressBar01"
        android:text="@string/please_wait_authenticating"
        android:id="@+id/txtText"
        android:paddingTop="30px"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
</RelativeLayout>

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