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
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