android - RadioGroup checkedButton property -

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i trying build radiogroup in android 1 radiobutton checked default. i'm wondering if possible through xml, rather programmatically.

the following code snippet doesn't seem work i'm getting error:

error: error: no resource found matches given name (at 'checkedbutton' value '@id/rdb_positive')

the code is:

<radiogroup     style="@style/forminputfield"     android:orientation="vertical"     android:checkedbutton="@id/rdb_positive"> <!-- error on line -->     <radiobutton         android:id="@+id/rdb_positive"         android:text="@string/answer_positive" />     <radiobutton         android:id="@+id/rdb_negative"         android:text="@string/answer_negative" /> </radiogroup>

it make sense in way, id of radiobutton defined after attribute in radiogroup set, wonder why there such attribute available.

use android:checkedbutton="@+id/rdb_positive" ,i think add + sign works


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