Possible to get color with string in kotlin?

Question

Ive had a look at this question but as of the time i typed this question, there aren't any answers with Kotlin code.

in my colours.xml file how would i access colours like these for example using a string?

<resources> <!-- Orange --> <color name="orangePrimary">#f6a02d</color> <color name="orange1">#e3952a</color> <color name="orange2">#da8f28</color> <color name="orange3">#d08926</color> </resources>

The Java version is apparently this

int desiredColour = getResources().getColor(getResources().getIdentifier("my_color", "color", getPackageName()));

when android studio translates the code i get this

val desiredColour: Int = getResources().getColor( getResources().getIdentifier( "my_color", "color", getPackageName() )

However packageName() and getResources() turn out red for some reason which means there is an error

So what would the Kotlin version be?

You can copy-paste Java code into a Kotlin file, and the IDE will automatically convert it to Kotlin for you. — Tenfour04
– Tenfour04, Commented Dec 25, 2020 at 3:45
When i use the code above i get the following translation which has red coloured code, meaning errors or code with a lot of different libraries to choose from, i dot know whats the right one.. val desiredColour: Int = getResources().getColor( getResources().getIdentifier( "my_color", "color", getPackageName() ) ) — Jevon
– Jevon, Commented Dec 25, 2020 at 4:29

saiful103a · Accepted Answer · 2020-12-26 05:42:56Z

There is only one possible explanation for this. getPackageName() and getResources() are not present where you are pasting the code.

For example if I paste your code in an activity, everything seems good.

val desiredColour = resources.getColor(resources.getIdentifier("my_color", "color", packageName))

with theme:

val desiredColour = resources.getColor(resources.getIdentifier("my_color", "color", packageName),theme)

But if I paste it inside fragment, I need to reference the activity of that fragment to get the package name.

val desiredColour = resources.getColor(resources.getIdentifier("my_color", "color", activity?.packageName))

with theme:

val desiredColour = resources.getColor(resources.getIdentifier("my_color", "color", activity?.packageName),activity?.theme)

And if for some reason you are pasting it elsewhere besides activity or fragment, you need to pass context or activity to call those method.

object TestSingleObject { fun getDesiredColour(context: Context) = context.resources.getColor(context.resources.getIdentifier("my_color", "color", context.packageName)) }

with theme:

object TestSingleObject { fun getDesiredColour(context: Context) = context.resources.getColor(context.resources.getIdentifier("my_color", "color", context.packageName), context.theme) }

@Jevon That is not a problem. Don't use the deprecated method. Instead, use the updated getColor method by providing the theme. Providing a theme shouldn't be difficult. Check my updated answer.
When i do the updated version i then get this error Call requires API level 23 (current min is 14): android.content.res.Resources#getColor by the way, i need a min 14.
@Jevon Yes, the overloaded getColor method with the theme was introduced much later. To use the updated method you need to update your min sdk version or make a backward compatible method to get color based on the running sdk version of the user.
Use ResourcesCompat.getColor instead (developer.android.com/reference/androidx/core/content/res/…) - there's a bunch of ThingCompat libraries to help your code run on a range of API levels

CPlus · Accepted Answer · 2023-09-23 23:49:05Z

You can set:

snackBar_View.setBackgroundColor(context.resources.getColor(com.example.app.R.color.colorPrimary))

Instead of:

snackBar_View.setBackgroundColor(context.getResources().getColor(R.color.redish))

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