GridView计算适配大小展示

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 gridview展示九宫图，大小计算不好，适配不同尺寸的手机，会出现上下滚动的效果，需要在gridview的适配器中计算每个控件的大小，根据屏幕宽高计算展示

效果图：
这里写图片描述

public class MenuGridViewAdapter extends BaseAdapter {    private GridView mGridview;    private Context mContext;    private int[] imgResource={R.drawable.cai1,R.drawable.cai1,R.drawable.cai1,R.drawable.cai1,R.drawable.cai1,R.drawable.cai1,R.drawable.cai1,R.drawable.cai1,R.drawable.cai1};    public MenuGridViewAdapter(GridView mGridview,Context mContext) {        super();        this.mContext = mContext;        this.mGridview=mGridview;    }    @Override    public int getCount() {        return imgResource.length;    }    @Override    public Object getItem(int position) {        return imgResource[position];    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView == null) {            convertView = LayoutInflater.from(mContext).inflate(R.layout.menu_grid_view, parent, false);        }        convertView.setLayoutParams(getLayoutParams(convertView));        ImageView img=BaseViewHolder.get(convertView, R.id.grid_img);        img.setImageResource(imgResource[position]);        return convertView;    }    /**      * 设置控件的宽高      *      * @创建日期 2016-5-14      *      * @参数   convertView      * @返回值 LayoutParams      *     */    private LayoutParams getLayoutParams(View convertView) {        WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);        //宽度：获取gridview的宽度减去左右的间距，因为3列，每列左右1个间距，然后再除以3，可计算出一个的宽度；高度类似        int width = (mGridview.getWidth()-6)/3;        int height = (mGridview.getHeight()-6)/ 3;        LayoutParams layoutParams = convertView.getLayoutParams();        layoutParams.width = width;        layoutParams.height = height;        return layoutParams;    }}

布局：

 <GridView        android:id="@+id/menu_gridview"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:horizontalSpacing="2dp"        android:verticalSpacing="2dp"         android:listSelector="@null"        android:numColumns="3"        android:scrollbars="none"        android:stretchMode="columnWidth"        android:gravity="center"          />

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