How to avoid duplicate value for resource 'attr/*' in CustomView

Question

If I import:

CustomViewA (imported from Maven)

<declare-styleable name="CustomViewA">
        <attr name="min" format="float"/>
        <attr name="max" format="float"/>
</declare-styleable>

CustomViewB (imported from Maven)

<declare-styleable name="CustomViewB">
        <attr name="min" format="float"/>
        <attr name="max" format="float"/>
</declare-styleable>

This will fail saying that min and max are duplicated. I thought Android would distinguish by the declare-styleable name, but guess not. Saying that, what's the best way to name a custom View attr to avoid any possible duplicate value clash in the future?

The only solution I got so far is:

<attr name="minForMyCustomViewHopingNoOneUsesThisName" format="float"/>

Which sucks.

Until namespaces are introduced this is our only option. – Eugen Pechanec Feb 21 '20 at 11:36 — Eugen Pechanec, Feb 21 '20 at 11:36
https://stackoverflow.com/a/4464966/4390987 – ॐ Rakesh Kumar Feb 21 '20 at 11:41 — ॐ Rakesh Kumar, Feb 21 '20 at 11:41

score 3 · Answer 1 · answered Feb 21 '20 at 11:44

3

you can do this

<attr name="min" format="float" />
<attr name="max" format="float" />

<declare-styleable name="CustomViewA">
    <attr name="min" />
    <attr name="max" />
</declare-styleable>

<declare-styleable name="CustomViewB">
   <attr name="min" />
   <attr name="max" />
</declare-styleable>

answered Feb 21 '20 at 11:44

Priyanka

2,671
9
33

Will this work if I'm the `CustomViewA` owner but not from `CustomViewB`? Assuming that the `CustomViewB` developer uses the `attr` outside of the `declare-styleable` and/or inside? – GuilhE Feb 21 '20 at 12:05
can't understand. what are you saying? – Priyanka Feb 21 '20 at 12:07
Let's say that in my custom lib I use your approach. Then I import another Lib that uses the same approach. Will it collide? – GuilhE Feb 21 '20 at 13:30
Sorry for the delay. No, it will not collide. It will be working fine if both libs have the same `attr elements` – Priyanka Feb 24 '20 at 04:10
yes, it will work fine with a different format and the same name in a different module – Priyanka Feb 24 '20 at 11:12
Unfortunately this will not work if CustomViewA (maven import) uses your approach but CustomViewB (maven import) does not. Just tested. – GuilhE Feb 26 '20 at 12:33

score 0 · Answer 2 · answered Feb 21 '20 at 11:41

0

To make it unique is the ultimate answer. I prepare to use

<attr name="custom_view_a_min" format="float"/>
<attr name="custom_view_b_min" format="float"/>

answered Feb 21 '20 at 11:41

Roman

1,799
1
16
17

How to avoid duplicate value for resource 'attr/*' in CustomView

2 Answers2