Android - Good GUI Design Tool to mock up iPhone & Android applications

I am about to embark on developing a mobile application for both the iPhone and the Android based phone. I have most of my gui mock ups written down on a white board and some in my head. I need to put them down on paper so I can relay my designs to others in my team. I was wondering what the best on-line gui mockup tool I could use?

I have a lot of experience with Visio and I truly like it. I want a tool that would be web based so I could collaborate with others on the team.

Does anyone have a suggestion for an easy gui mockup tool that I could use?

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Android - How to align views at bottom of screen?

Here's my layout code;

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:text="@string/welcome" 
        android:id="@+id/TextView" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content">
    </TextView>

    <LinearLayout android:id="@+id/LinearLayout" 
        android:orientation="horizontal"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:gravity="bottom">

            <EditText android:id="@+id/EditText" 
                android:layout_width="fill_parent" 
                android:layout_height="wrap_content">
            </EditText>

            <Button android:text="@string/label_submit_button" 
                android:id="@+id/Button" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content">
            </Button>

    </LinearLayout>
</LinearLayout>

What this looks like is on the left and what I want it to look like is on the right.



The obvious answer is to set the TextView to fill_parent on height but this causes no room to be left for the button or entry field. Essentially the issue is that I want the submit button and the text entry to be a fixed height at the bottom and the text view to fill the rest of the space, similarly in the horizontal Linear layout I want the submit button to wrap its content and for the text entry to fill the rest of the space.
If the first item in a Linear Layout is told to fill_parent it does exactly that, leaving no room for other items, how do I get an item which is first in a linear layout to fill all space apart from the minimum required by the rest of the items in the layout?

EDIT:
Relative Layouts were indeed the answer - Thank you!

    <?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="fill_parent">

    <TextView 
        android:text="@string/welcome" 
        android:id="@+id/TextView"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true">
    </TextView>

    <RelativeLayout 
        android:id="@+id/InnerRelativeLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true" >

        <Button 
            android:text="@string/label_submit_button" 
            android:id="@+id/Button"
            android:layout_alignParentRight="true" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
        </Button>

        <EditText 
            android:id="@+id/EditText" 
            android:layout_width="fill_parent"
            android:layout_toLeftOf="@id/Button"
            android:layout_height="wrap_content">
        </EditText>

    </RelativeLayout>
</RelativeLayout>

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Android - Display current value of Preference in Preference summary

When the user is editing preferences in an Android app, I'd like them to be able to see the currently set value of the preference in the Preference summary.

Example: if I have a Preference setting for "Discard old messages" that specifies the number of days after which messages need to be cleaned up. In the PreferenceActivity I'd like the user to see:

"Discard old messages" <- title

"Clean up messages after x days" <- summary where x is the current Preference value

Extra credit: make this reusable, so I can easily apply it to all my preferences regardless of their type (so that it work with EditTextPreference, ListPreference etc. with minimal amount of coding).

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