dialog_loading_layout.xml

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

    <LinearLayout
        android:layout_width="80dip"
        android:layout_height="80dip"
        android:layout_centerInParent="true"
        android:background="@drawable/loading_progress_bg"
        android:gravity="center"
        android:orientation="vertical">

        <ProgressBar
            android:layout_width="45dp"
            android:layout_height="45dp"
            android:indeterminateDrawable="@drawable/progressbar"
            android:layout_gravity="center"
            />

        <TextView
            android:id="@+id/loading_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:textSize="12sp"
            android:text="@string/loading"
            android:textColor="#9a9b98"/>
    </LinearLayout>

</RelativeLayout>