Suppose I have my own two custom defined themes in the styles.xml, one for Dark and one for Light. When a user goes into their smartphones settings and change to dark mode, how do I have my application use my own custom dark theme? Same with my Light theme.
In general, I suppose my question is more like how do I control what color my application uses when a user changes between light and dark mode. I do not want to use the default colors that come in each mode.
You can override the colors that you use in your layout and put them in values-night/colors.xml. So, in light theme values/colors.xml will be used and in the night theme, values-night/colors.xml will be used.
Let's say you have a color assigned to a button, you write following line, make sure the color name is same:
values/colors.xml
<color name="colorButton">#6d85c9</color>
values-night/colors.xml
<color name="colorButton">@color/colorWhite</color>
And then you can assign the color to the button you do normally.
Let me know if you have more questions.