=========
styles.xml
=========
<style name="TransparentProgressDialog" parent="@android:Theme.Holo.Light.Dialog">
        <item name="android:windowFrame">@null</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowTitleStyle">@null</item>
        <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
        <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
        <item name="android:backgroundDimEnabled">true</item>
        <item name="android:background">@android:color/transparent</item>
</style>

==========================
custom_progress_layout.xml
==========================
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:alpha="0.5"
    android:gravity="center"
    android:orientation="vertical" >

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:indeterminateDrawable="@drawable/custom_progress_drawable" />

</LinearLayout>

============================
custom_progress_drawable.xml
============================
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="360" >

    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="8"
        android:useLevel="false" >
        <size
            android:height="10dip"
            android:width="10dip" />

        <gradient
            android:centerColor="#4c737373"
            android:centerY="0.50"
            android:endColor="#ffffd300"
            android:startColor="#4c737373"
            android:type="sweep"
            android:useLevel="false" />
    </shape>

</rotate>


=================
TestActivity.java
=================

Dialog dialog = new Dialog(context, R.style.TransparentProgressDialog);
dialog.setCancelable(false);
dialog.setCanceledOnTouchOutside(false);
dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.custom_progress_layout);
dialog.show();
/*
...
...
*/
dialog.dismiss();