Android: How to obtain the resource ID of the current theme?

Question

In Android, you can get the current theme of an activity as a Resource.Theme object from getTheme(). Also, you can set the theme to a different one via that other theme's resource id, as in setTheme(R.style.Theme_MyTheme).

But how do I find out whether it's worth it -- whether the current theme is already the one that I would want to set? I am looking for something like getTheme().getResourceId(), in order to write something like:

protected void onResume() {     int newThemeId = loadNewTheme();     if (newThemeId != getTheme().getResourceId()) { // !!!! How to do this?         setTheme(newThemeId);         // and rebuild the gui, which is expensive     } } 

Any ideas?

Answer 1

I found a way to solve the requirement without getting the resource id.

I'm adding an item to each of my themes with the name of the string:

<item name="themeName">dark</item> 

And in the code I check the name like so:

TypedValue outValue = new TypedValue(); getTheme().resolveAttribute(R.attr.themeName, outValue, true); if ("dark".equals(outValue.string)) {    ... }