Can one not use @+id with ArrayAdapter layout XML file?

by blindfold » Sun, 28 Dec 2008 17:03:56 GMT

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 Not using @+id through

ArrayAdapter<String> MyList = new ArrayAdapter<String>(this,

works fine, but using @+id through

ArrayAdapter<String> MyList = new ArrayAdapter<String>(this,;

does not, where my mylist.xml reads

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="" ;

It all compiles just fine, but at runtime I get

ERROR/AndroidRuntime(1356): android.content.res.Resources
$NotFoundException: Resource ID #0x7f06001a type #0x12 is not valid

Am I missing some conceptual issue with the use of ArrayAdapter or the
way @+id gets expanded? Of course I can just use R.layout.mylist, but
it feels a bit inconsistent as I use the referencing in my source
code with many other items (albeit through findViewById()).



Can one not use @+id with ArrayAdapter layout XML file?

by Mark Murphy » Sun, 28 Dec 2008 21:07:53 GMT


R.layout points to layout resources. Layout resources are used whenever
Android wants to inflate a tree of Views, such as setContentView(),
manual inflation via getLayoutInflater(), etc. points to individual widgets (Views) within an inflated layout. values have no meaning outside the context of a specific layout --
in other words, means nothing on its own, but
myInflatedView.findViewById( might, if myInflatedView was
inflated from a layout resource that had something with

In the documentation for the ArrayAdapter constructor you're using, the
second parameter is described as:

"The resource ID for a layout file containing a TextView to use when
instantiating views."

Hence, it is expecting something in the R.layout space ("resource ID for
a layout file").

Mark Murphy (a Commons Guy) 
_The Busy Coder's Guide to Android Development_ Version 1.9 Available!


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Can one not use @+id with ArrayAdapter layout XML file?

by blindfold » Mon, 29 Dec 2008 08:42:50 GMT

 Thanks a lot for your clarification, Mark! Very lucid.



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