I am followin the method described here to create an EditText input activity. But the view doesn't fill the width of the screen. How can I tell to fit the screen width?

<activity android:name="TextEntryActivity" 
          android:label="My Activity" 
          android:theme="@android:style/Theme.Dialog"/>

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:orientation="vertical"
    android:gravity="right"
    android:layout_height="wrap_content">
    <EditText
        android:text="@+id/txtValue"
        android:id="@+id/txtValue"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"></EditText>
    <Button
        android:text="Done"
        android:id="@+id/btnDone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
</LinearLayout>