Question

The following is the code for login button:

    <button type="submit" data-theme="a" id="loginButton">Login</button> 

Now, i have to increase the Login button size and display at the center of the Page. Please share if any ideas.

Answer 1

If you are using ecplise, then you can use the Layout weight under the Property section of the button
Or a quicker way would be to set

   <button 
    type="submit" 
    data-theme="a" 
    android:layout_width="40dp"  //set size depending on your requirements
     android:layout_width="wrap_content"
    android:layout_centerInParent="true"   
    id="loginButton">

       Login

  </button> 

EDIT: Sorry, I thought you desired to increase the size of button. For centering it , use
RelativeLayout

    <RelativeLayout android:id="@+id/RelativeLayout01" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent"
      xmlns:android="http://schemas.android.com/apk/res/android">

      <button 
        type="submit" 
        data-theme="a" 
        android:layout_width="40dp"  //set size depending on your requirements
        android:layout_width="wrap_content"
        android:layout_centerInParent="true"   
       id="loginButton">

       Login

    </button> 

 </RelativeLayout>

The attribute android:layout_centerInParent="true" will center it with respect to the screen