I've got two images. I want to do so: when user opens an app with a Light theme - the first image is being used as a background for layouts. When user opens the app with a Dark theme - the second image is being used as a background for layouts.

To solve this problem with text colors, we can just use styles.xml and colors-day/night.xml and one line of code: <item name="android:textColor">@color/textColor</item>

I've tried to the same with images and two styles files: <item name="android:background">@drawable/day</item>

But this feature applies background to each element on a screen, not only to the main layouts.

I know, that I can do it programatically by changing a background with if statements and layout.setBackgroundResource(R.drawable.day/night);

But maybe it can be done with XML as in the case of the text color?

CodePudding user response：

To solve this problem with text colors, we can just use styles.xml and colors-day/night.xml and one line of code: @color/textColor

You need to do the same thing, but instead of res/values/colors.xml, it should be done on the drawable res/drawable/day

So, you'll have a drawable & drawable-night folders in the res directory each of which should have a unique version of the day image with the same name.

They should look like in Android Studio (Android preview):

And normally use the the attribute name="android:background">@drawable/day</item>