android GridView设置边框教程！

<!--?xml version=1.0 encoding=utf-8?-->
<relativelayout android:layout_height="wrap_content" android:layout_width="fill_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android">
<linearlayout android:gravity="center_vertical" android:id="@+id/recommend_item_content_linear" android:layout_height="wrap_content" android:layout_width="fill_parent" android:orientation="horizontal" android:paddingbottom="5dp" android:paddingtop="6dp">
<imageview android:contentdescription="@null" android:id="@+id/recommend_item_icon" android:layout_height="50dp" android:layout_marginleft="2dp" android:layout_width="50dp" android:src="@drawable/icon">
<linearlayout android:gravity="center_vertical" android:layout_height="wrap_content" android:layout_marginleft="3dp" android:layout_width="wrap_content" android:orientation="vertical">
<textview android:id="@+id/recommend_item_appname" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="测试文字" android:textcolor="@color/black" android:textsize="@dimen/text_size">
<linearlayout android:layout_height="wrap_content" android:layout_width="wrap_content" android:orientation="horizontal">
<textview android:id="@+id/recommend_item_intro" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="体验" android:textcolor="@color/dimgray" android:textsize="@dimen/small_small_text_size">
<textview android:id="@+id/recommend_item_money" android:layout_height="wrap_content" android:layout_marginleft="2dp" android:layout_width="wrap_content" android:text="+4万5" android:textcolor="@color/yellow_red" android:textsize="@dimen/little_title_size">
</textview></textview></linearlayout>
</textview></linearlayout>
</imageview></linearlayout>
<view android:background="@drawable/custom_tab_indicator_divider" android:contentdescription="@null" android:id="@+id/recommend_item_bottomline" android:layout_below="@+id/recommend_item_content_linear" android:layout_height="1px" android:layout_width="fill_parent">
<view android:background="@drawable/custom_tab_indicator_divider" android:contentdescription="@null" android:id="@+id/recommend_item_rightline" android:layout_alignbottom="@+id/recommend_item_bottomline" android:layout_alignparentright="true" android:layout_height="fill_parent" android:layout_width="1px">
</view></view></relativelayout>