Possible to change Window background colour of a Dialog without a theme?

At the moment I extend a Dialog and use the constructor Dialog(Context context, int theme) to set the background colour via a theme. This dialog is an overlay, so it sits above everything showing on the screen. The theme is as follows:

<style
  name="Theme.example"
  parent="android:Theme">
    <item name="android:windowIsTra开发者_如何学运维nslucent">true</item>
    <item name="android:backgroundDimEnabled">false</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsFloating">false</item>
    <item name="android:windowFullscreen">false</item>
    <item name="android:windowAnimationStyle">@null</item>
    <item name="android:windowFrame">@null</item>
    <item name="android:windowBackground">@color/background_color</item>
</style>

Note that this theme sets the background colour via the android:windowBackground attribute. I need the entire screen to change colour, including the notification bar. But I also want to be able to change the background dynamically in Java after the dialog is displayed. The best way I've come up with is using getWindow().setBackgroundDrawableResource(R.drawable.background), where the Drawable is just a single pixel of the colour I want.

Is there a better way to do this? My current method works fine, but it would be nice to be able to use colours that I haven't predefined in R.drawable.

Try it with the ColorDrawable class.

You can create a new instance of the ColorDrawable class and set it as the background. Whenever you need to change the color you can just call setColor(int color) on that class.

ColorDrawable colorDrawable = new ColorDrawable();
// ColorDrawable colorDrawable =
//     new ColorDrawable(0xFF00FF00);    // With a custom default color.

colorDrawable.setColor(0xFFFF0000);