activity_main.xml

<!-- 
/* Tuto Custom GridView Android
 * @author Zied Rebhi
 * http://www.tutozone.info
 */
 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
<EditText
        android:id="@+id/search"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Search something.." >

        <requestFocus />
    </EditText>
    <GridView
         
         android:gravity="center"
         android:columnWidth="100dp"
         android:stretchMode="columnWidth"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:id="@+id/grid"
         android:horizontalSpacing="1dp"
        android:numColumns="auto_fit"
        android:verticalSpacing="1dp"
         />
</LinearLayout>