如何设置android中的按钮宽度来覆盖屏幕宽度？

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

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)

Answer 2

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 3

you can use following code:

  <Button
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"/>

You must to do 0dp in width on every button.