Without your code it is impossible to answer your question. Assuming your need, this may be help you...
[This will help you only for 3 images]
<relativelayout>
android:id="@+id/relativeLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<imageview>
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:src="@drawable/img1"/>
<imageview>
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:centerinHorizontal="true"
android:centerinVertical="true"
android:src="@drawable/img2"/>
<imageview>
android:id="@+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:src="@drawable/img3"/>
</imageview></imageview></imageview></relativelayout>