巧妙地添加GridView的 网格线

ListView 中设置分隔线的加如下参数即可:
android:divider="@color/gray"
android:dividerHeight="1dp"

GridView网格布局，默认情况下是没有网格线的

查找网上资料，找到了一种为GridView添加网格线的小技巧

实际上，该网格线是通过设置GridView各子项的间隔，并分别设置GridView背景色与子项背景色实现的。

实现方法

1. 设置GridView背景色，设置水平间方向间隔属性值android:horizontalSpacing和竖直方向间隔属性值android:verticalSpacing
2. 设置GridView子项背景色

示例代码：
1.main.xml
 <GridView
        android:id="@+id/gv_words"
        android:visibility="gone"
        android:background="@color/gray"
        android:columnWidth="60dp" 
        android:numColumns="5"
        android:listSelector="@null" 
        android:verticalSpacing="1.0px" 
        android:horizontalSpacing="1.0px"
        android:soundEffectsEnabled="true"
        android:smoothScrollbar="true"  
        android:stretchMode="columnWidth" 
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@+id/llayout2"
        android:layout_below="@+id/llayout1"/>

2.GrivViewItem布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/white" >
    <RelativeLayout
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_margin="5dp">

<TextView
            android:id="@+id/gv_bushou_TextView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/ItemImage"
            android:layout_margin="1dp"
            android:layout_alignParentTop="true"
            android:layout_alignParentLeft="true"
            android:layout_above="@+id/gv_bushou_TextView2"
            android:layout_toLeftOf="@+id/gv_bushou_TextView2"
            android:textSize="25dp"
            android:textColor="@color/blue"
            android:text="难" >
        </TextView>
   
        <TextView
            android:id="@+id/gv_bushou_TextView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/ItemImage"
            android:layout_alignParentBottom="true"
            android:layout_alignParentRight="true"
            android:textColor="@color/gray"
            android:textSize="10dp"
            android:text="1笔" >
        </TextView>
    </RelativeLayout>
</LinearLayout>

3.运行截图

2、定义Selector来实现

http://stackoverflow.com/questions/7132030/android-gridview-draw-dividers