Simple dialog using a custom layout displayed full screen over the content, with no title or border etc..

Dialog - Custom layout

private Dialog getCustomDialog(String productSpecs) {
	final Dialog dialog = new Dialog(this, R.style.Dialog);
	dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
	dialog.getWindow().setBackgroundDrawable(new ColorDrawable(0));
	dialog.setCancelable(true);		
	dialog.setContentView(R.layout.some_layout);
	// dialog.findViewById stuff here...
	return dialog;
}

<style name="Dialog">
  <item name="android:windowFrame">@null</item>
  <item name="android:windowIsFloating">true</item>
  <item name="android:windowContentOverlay">@null</item>
  <item name="android:windowIsTranslucent">true</item>
  <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
  <item name="android:windowBackground">@color/color_dialog_window_background</item>
  <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
  <item name="android:colorBackgroundCacheHint">@null</item>        
  <item name="android:backgroundDimEnabled">false</item>
</style>