I did notice some classes are highlighted in blue in my project structure. What is the reason?
It is because Version Control(like Git) have been enable in your project. Go to File -> Settings -> Editor . Under Version Control select File Status Colors . It contains list of different colors and what they mean.
Color instances are a representation introduced in Android O to store colors in different color spaces , with more precision than both color ints and color longs.
To expand on tyczj's answer, if version control is being used on the project then file names may be highlighted in different colours in the file explorer, editor tabs and active changes tab:
So in your example you have two modified files that already exist in version control.
As Zoe points out, this reflects the default colour scheme in Android Studio and IntelliJ. These colours may be modified via Settings -> Editor -> Color scheme -> VCS
Because you are using version control and you have uncommitted changes for those files
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