How to wrap Image buttons in a horizontal linear layout?

Is there any way to wrap Image buttons in Horizontal Linear Layout? Or is there any other way to do the following thing?

I have six image buttons. Suppose these buttons are appearing in a mid resolution device like this:

Image button 1 | Image button 2 | Image button 3 | (1st row)

Image button 4 | Image button 5 | Image button 6 | (2nd row)

I want these buttons to appear in a tablet or any high resolution device like this:

Image button 1 | Image button 2 | Image button 3 | Image button 4 | (1st row)

Image button 5 | Image button 6 |      (2nd row)

Or like this:

Image button 1 | Image button 2 | Image button 3 | Image button 4 | Image button 5 | 
Image button 6 |

According to device screens.

Here is my main XML file:

<?xml version="1.0" encoding="utf-8"?>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@layout/back2">


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@layout/back2">
<TextView
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:background="@layout/button5"
        android:gravity="center"
        android:orientation="vertical"
        android:text="@string/hello"
        android:textColor="#D5D5D5"
        android:textSize="20sp" />
<com.google.ads.AdView android:id="@+id/adView"
                         android:layout_width="wrap_content"
                         android:layout_he