**The RelativeLayout is one of viewpager's view.
No item or some items the button is visible but,when the Listview's item fills the screen.the button is invisible.**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rl_favorite"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/bg_color" >
<com.wwtest.widget.pullToRefresh.PullToRefreshListView
android:id="@+id/listview_favorite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:descendantFocusability="blocksDescendants"
android:divider="@drawable/solid_line"
android:dividerHeight="1dip"
android:scrollbars="none" >
</com.wwtest.widget.pullToRefresh.PullToRefreshListView>
<TextView
android:id="@+id/tv_faHint"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@+id/listview_favorite"
android:textColor="@color/black"
android:textSize="20sp"
android:visibility="gone" />
<Button
android:id="@+id/btn_add"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:layout_below="@+id/listview_favorite"
android:background="@drawable/btn_favorite_selector"
android:gravity="center"
android:text="add"
android:textColor="@color/black"
android:textSize="20sp"
android:visibility="visible" />
</RelativeLayout>