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findViewById, R.id member cannot be resolved [message #1245059]

Thu, 13 February 2014 03:31

Eclipse User

Hi,
First post here - hope this is the appropriate forum for the following question:

I'm using the Java ADT and trying to add a button to a working example project.
The following line produces a "cannot be resolved" error because "toggleButton" is missing from R.id.

Button toggleButton = (Button) findViewById(R.id.toggleButton);
(This seems to be declaring a new variable using a reference to itself.)

The editor offers to "create field 'toggleButton' in type id", but then warns that I'm modifying a "derived file", "R.Java".

How does one declare a variable this way?

Thanks/Cheers.

FOLLOW UP (for future newbie):
The problem went-away after defining the button in the \res\layout\main.xml (see text below).
Apparently R.java is derived from the XML resource, not from variable declarations in the "source" directory.
" <Button
android:id="@+id/toggleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Toggle Silent Mode"
/>
"

[Updated on: Sun, 16 February 2014 13:50] by Moderator

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