How to set custom theme attribute programmatically in Android 10

Question

It is easy to change theme attributes in styles.xml, and to define new custom theme attributes in attrs.xml.

But how to do it in java code?

After calling setTheme in Activity, how to change or define attribute programmatically?

TestActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Apply "AppTheme" to this Activity
    super.setTheme(R.style.AppTheme);

    // How to change theme attribute "colorPrimary" or "android.R.attr.colorPrimary" in here?

    // How to define new custom theme attribute "customThemeAttribute" in here?
}

Thanks.

stackbiz · Accepted Answer · 2020-06-05 10:28:42Z

3

After doing some research, there is no way to set theme attribute programmatically.

answered Jun 5, 2020 at 10:28

stackbiz

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1 Comment

SebasSBM Over a year ago

Well, I am glad you researched. This might go out of scope of OP's question, but I think it doesn't. But isn't there alternatives? I recently started to segregate/extract repeated attributes from my XML view files into <style> elements. I followed this guide . This removes duplication, that's fine... So, now I got a main MyStyle that I apply to the main layouts, and several children for other color settings. Isn't it possible to apply those <style>s to the implied objects programatically?

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