Try this code and set click listener on the linear layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent" >
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/ll">
<Button android:id="@+id/buttonx" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_alignParentRight="true"
android:layout_alignParentTop="true" android:text="X" />
</LinearLayout>
</RelativeLayout>