GirdLayout佈局實現九宮格

利用GirdLayout佈局顯示3*3佈局的9張圖片，每張圖片寬度爲屏幕的1／3：

 <GridLayout
            android:id="@+id/content"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:columnCount="3"
            android:rowCount="3"
            android:layout_gravity="center_horizontal"
            android:gravity = "center_horizontal"
            android:useDefaultMargins="true">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic1">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic2">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic3">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic4">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic5">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic6">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic7">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic8">

            </ImageView>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:adjustViewBounds="true"
                android:src="@drawable/ic9">

            </ImageView>


        </GridLayout>