用代碼适配Gridview使得高度既不出現滾動條也不出現空白區

如圖，是美工給的界面圖，在實作中，中間的九宮格用gridview來實作。但在不同的dpi下，gridview要麼顯示不全需要滾動浏覽，要麼留出空白區域。

界面的布局檔案代碼：

<?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="match_parent"
    android:orientation="vertical" >

    <cn.llzg.plotwiki.ui.stub.HeaderBar
        android:id="@+id/headerbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

    </cn.llzg.plotwiki.ui.stub.HeaderBar>

    <ImageView
        android:id="@+id/neck_img"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.3"
        android:scaleType="fitXY"
        android:src="@drawable/neck_img" />

    <GridView
        android:id="@+id/gridv_business_home"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@color/gray"
        android:horizontalSpacing="1px"
        android:verticalSpacing="1px"
        android:numColumns="3"
         >
    </GridView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.13"
        android:gravity="center"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/tv_add_business"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/selector_grey"
            android:gravity="center"
            android:padding="6dp"
            android:text="@string/add_business"
            android:textSize="@dimen/large_size" />

    </LinearLayout>

</LinearLayout>
           

為了使得gridview正好顯示3行，需要在定義擴充卡的getView()方法中用代碼計算其高度，解決方法如下：

@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View view = LayoutInflater.from(BusinessActivity_3.this).inflate(
					R.layout.item_grid_business, null);
			ImageView img = (ImageView) view
					.findViewById(R.id.img_business_icon);
			TextView iv = (TextView) view
					.findViewById(R.id.tv_business_caption);
			img.setImageResource(itemPicIds[position]);
			iv.setText(itemStrs[position]);
			<span style="color:#ff6666;">int height=gridview.getHeight()/3;
			AbsListView.LayoutParams params=new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT, height);
			view.setLayoutParams(params);</span>
			return view;
		}