Thank you, Mark, that is indeed good to know and a nice addition. I am indeed targeting 1.6, so I could have used this. I'm sure there were situations under the previous rules that things could not be done easily, or maybe at all.
For me, things are working correctly using the pre-1.6 rules, so I'll let sleeping dogs lie until changes are required. On Mar 13, 8:05 am, Mark Murphy <mmur...@commonsware.com> wrote: > Brion Emde wrote: > > RelativeLayout makes only a single pass through your XML to > > determine the Ids and collect the layout information. > > That is not true, as of Android 1.6. > > It didn't get much publicity, but RelativeLayout now supports forward > references. The key is you need to use the + sign on the *first > occurrence* of the ID: > > <?xml version="1.0" encoding="utf-8"?> > <RelativeLayout > xmlns:android="http://schemas.android.com/apk/res/android"; > android:layout_width="fill_parent" > android:layout_height="wrap_content" > android:padding="5px"> > <TextView android:id="@+id/label" > android:layout_width="wrap_content" > android:layout_height="wrap_content" > android:text="URL:" > android:layout_alignBaseline="@+id/entry" > android:layout_alignParentLeft="true"/> > <EditText > android:id="@id/entry" > android:layout_width="fill_parent" > android:layout_height="wrap_content" > android:layout_toRightOf="@id/label" > android:layout_alignParentTop="true"/> > <Button > android:id="@+id/ok" > android:layout_width="wrap_content" > android:layout_height="wrap_content" > android:layout_below="@id/entry" > android:layout_alignRight="@id/entry" > android:text="OK" /> > <Button > android:id="@+id/cancel" > android:layout_width="wrap_content" > android:layout_height="wrap_content" > android:layout_toLeftOf="@id/ok" > android:layout_alignTop="@id/ok" > android:text="Cancel" /> > </RelativeLayout> > > Here, the first reference to the ID of "entry" is in: > > android:layout_alignBaseline="@+id/entry" > > That means we can skip the + sign in the corresponding android:id attribute: > > <EditText > android:id="@id/entry" > > So long as you are still targeting Android 1.5, I would not rely upon > this. However, once Android 1.5 is in your rear-view mirror, you gain > more flexibility. > > -- > Mark Murphy (a Commons > Guy)http://commonsware.com|http://twitter.com/commonsguy > > Android Training in NYC: 10-11 April 2010:http://guruloft.com -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
