CODEWITHSUNDEEP
androidxmlandroid-studiokotlin
crgarridos
crgarridos

Reputation: 9263

Using dots in xml ids

this is my first question

In Java I have never had this problem before.

I spent two days because I had an issue just on design mode on Android studio inflating a CustomView with kotlin. I had a findByView = null after the inflate. Running the app, all is right

View.inflate(context, R.layout.widget_navigation_section_button, this) 
mLabel = findViewById(R.id.navigation_section_title)
mLabel.setText("something")

That throws a NPE (for real in kotlin: kotlin.TypeCastException: null cannot be cast to non-null type android.widget.TextView at ... $mLabel$2.invoke(CustomView.kt:22))

Normally, I use a <layout>[.<where_container>].<name> pattern to name ids and string on XMls (ex: android:id="@+id/main.description_container.title")
This is translated automatically in R.id.main_description_container_title(notice dots become underscores) in code

The issue was solved when I replace these dots with underscores manually in the XML

I was looking for name conventions explaining why dots should not used in ids or string naming, but without success. I want to know what is the real issue with this name convention. This should be really avoid it ?

Should I just drop the idea and just user underscores ? Looking at it is an issue just on kotlin, maybe some gradle configuration ther ?

Thank you in advance

Upvotes: 1

Views: 2017

Answers (1)

Dmytro Rostopira
Dmytro Rostopira

Reputation: 11165

You can't use dots, because following expression R.id.main.description_container.title will try to find member main which has type Int and then try find property description_container, but Int doesn't have such property

Upvotes: 3

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