Android databinding build error: constant expression required

Question

I am writing Android application using DataBinding by referencing https://developer.android.com/topic/libraries/data-binding/index.html.

But while building my project, It is showing an error in generated class as

> '/databinding/DataBinderMapper.java:10: error: constant expression
> required.'

This error is happening in switch statement inside generated class DataBinderMapper.java (This file is an auto generated file for databinding)

Any one knows the reason for this java switch case error happening in Auto generated buld file?

Edits: I found the reason for this issue is, layout reference created in R.java file is not final for this case. For example, in my case layout reference in R.java is

public static int activity_main=0x7f04001c;

Actually it should be

public static final int activity_main=0x7f04001b;

But I don't know the reason for this happened and how to change it to final.

Did you try a clean build?

George Mount
– George Mount

2017-09-13 22:41:04 +00:00
Commented Sep 13, 2017 at 22:41 — George Mount
– George Mount, Commented Sep 13, 2017 at 22:41
Yeh, But same error

Zubair
– Zubair

2017-09-14 04:33:17 +00:00
Commented Sep 14, 2017 at 4:33 — Zubair
– Zubair, Commented Sep 14, 2017 at 4:33

Marcos Vasconcelos · Accepted Answer · 2017-09-13 13:29:19Z

1

Probably your model that you are binding against has final modifiers in its variables.

answered Sep 13, 2017 at 13:29

Marcos Vasconcelos

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Comments

Ranjith KP · Accepted Answer · 2017-09-14 08:51:19Z

1

This error happens when your project has dependency with library or external plugin apart from application. The reason for this issue is, the ids generated might clash when you have dependency with multiple library/ plugins.

edited Sep 14, 2017 at 8:51

answered Sep 14, 2017 at 7:43

Ranjith KP

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1 Comment

Zubair Over a year ago

In my case, there were two plugins applied for my project. Removing this corrected the issue. But in my project, I must apply this plugin to work with other dependencies. Do you have any idea to correct this issue without removing these plugins?

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