R is the android auto-created resource class. Use the custom color variable in the java file example.Use the custom color variable in an XML file such as the layout XML file example.The custom color variations can be used in both XML and java files. How To Use Custom Color Variable Defined In Colors.xml.

Click it, there will popup Choose Color dialog which can let you modify color more easily.

For each color variable, there is a color block at the line beginning.

#f1a86c is just the color RGB value that the color variable represents. The name attribute value ( for example “ colorRed” ) will be used as a variable name referred to in other XML files or java source codes. Double click it, input below color definition XML data in it.

Then colors.xml file will be created in the left panel under the app/res/values folder.In the New Resource File dialog window, input keyword colors in the File name input box, select main in the Source set drop-down list, input values in the Directory name input text box, then click the OK button.Click New -> Values resource file menu item to popup the New Resource File dialog window. Go to android studio Project View -> Android Subview.If you use a defined color variable, you just need to change the color definition file in one place. If you want to change the color value, you should change so many files. Easier to maintain: Suppose you use one color value in a lot of places such as java source code, XML files, etc.Such as backgroundColorRed, from this variable name we can see that this variable is not only represented the red color but also represent a background color. Easier to remember: You can assign a more meaningful name to a color value.Define and use the color variable instead of color value such as “#112233” in java code or XML file has below advantages.

Color theme android studio