how to set width of buttons in android to cover screen width?

Question

friends,

i have following three button in linear layout with width fill_parent

now how can i set width of these buttons to cover whole screen area equally?

any help would be appriciated.

<Button 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:id="@+id/btnReplyMessage" 
            android:gravity="left"
            android:text="Reply" />

     <Button 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:id="@+id/btnMarkAsUnread"
            android:gravity="left" 
            android:text="Mark as unread" />

            <ImageButton android:id="@+id/btnDeleteMessage"
                        android:src="@drawable/imgsearch"
                        android:gravity="right" android:layout_height="wrap_content"
                        android:layout_width="wrap_content"
                        android:layout_alignParentRight="true"
        />

Answer 1

You should just specify these attributes for each button:

android:layout_width="fill_parent"
android:layout_weight="1"

So it should be something like that:

<LinearLayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content">
  <Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"/>
  <Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"/>
  <Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"/>
</LinearLayout>

Answer 2

Give all buttons the following properties

android:layout_width="fill_parent"
android:layout_weight="1"

fill_parent tells them to consume as much width as possible, and weight determines how that width shall be distributed, when more than one control are competing for the same space. (Try playing around with different values of weight for each button to see how that works)