title: Make buttons have the same width in layout
body: <p>I put 4 buttons in a relative layout.
  I want them to have the same width, and fix for any screen size of a phone.
  My code as below:</p>
  
  <pre><code>&lt;RelativeLayout
              android:id="@+id/relativeLayout1"
              android:layout_width="match_parent"
              android:layout_height="38dp" &gt;
  
              &lt;Button
                  android:id="@+id/button1"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentLeft="true"
                  android:layout_alignParentTop="true"
                  android:text="Button" /&gt;
  
              &lt;Button
                  android:id="@+id/button2"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentTop="true"
                  android:layout_toRightOf="@+id/button1"
                  android:text="Button" /&gt;
  
              &lt;Button
                  android:id="@+id/button3"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentTop="true"
                  android:layout_toRightOf="@+id/button2"
                  android:text="Button" /&gt;
  
              &lt;Button
                  android:id="@+id/button4"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentTop="true"
                  android:layout_toRightOf="@+id/button3"
                  android:text="Button" /&gt;
  
          &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>What should I modify?</p>