Force Android widget to span full screen width

I'm having a hard time getting this to work. The Android documentation, while seemingly straightforward, doesn't get me where I need to be.

What I want to do is my widget should be the width of the phone regardless of form factor

I need it to be 4 x 1 (or 4 x 2 is fine) ... but it needs to fill the width.

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
  android:minWidth="250dp"
  android:minHeight="100dp"
  android:previewImage="@drawable/main_app_icon"
  android:initialLayout="@layout/initial_widget_layout"
  android:updatePriodMillis="0"/>

      

        
        
        
      

    

I understand that minHeight is wrong. Can you also offer some guidance on this?

Thank.

EDIT: While I understand that there are a number of threads talking about widgets, I can't find one that explains how to get the widget to fill the full width of the screen.