Why android xml file name must contains only lowercase letters and digits ([a-z0-9_.])?

Question

I am usually name my file in camelCase (like tabActive). But it is not allowed in Android.

Is there any reason why android xml file name must contains only lowercase letters and digits ([a-z0-9_.])?

Error:Gradle: Execution failed for task ':app:mergeDebugResources'.

/home/trungdq/.../res/drawable/tab-active.xml: Error: Invalid file name: must contain only lowercase letters and digits ([a-z0-9_.])

Answer 1

It's simple: out of xml filenames the Java constants get generated. The later have very strict rules about how they may be built