1---

寬度比較好辦，可以通過
int width =  (int) this.getWindowManager().getDefaultDisplay().getWidth()/5;
得到。然後
gridview.setColumnWidth(Width);

2---

高度

這個可用，有效

public class MyAdapter extends BaseAdapter {

        GridView mGv;   
    public static int ROW_NUMBER = 5;

        public MyAdapter (GridView gv, Context mContext, ArrayList<String> list) {
        this.context = mContext;
        this.mGv = gv;
        lstDate = list;
    }

       @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        convertView = LayoutInflater.from(context).inflate(R.layout.item, null);

        AbsListView.LayoutParams param = new AbsListView.LayoutParams(
                android.view.ViewGroup.LayoutParams.FILL_PARENT,
                mGv.getHeight()/ROW_NUMBER);
        convertView.setLayoutParams(param);

        return convertView;
    }
 

另外，如果ROW_NUMBER是不定的

ROW_NUMBER = (gridAdapterList.size()+2)/3;

if (ROW_NUMBER != 0){
AbsListView.LayoutParams param = new AbsListView.LayoutParams(android.view.ViewGroup.LayoutParams.FILL_PARENT,gv_project.getHeight()/ROW_NUMBER);
convertView.setLayoutParams(param);
}

還有一種

        }

http://stackoverflow.com/questions/5690144/how-can-i-force-a-gridview-to-use-the-whole-screen-regardless-of-display-size

http://www.bcoder.com/java/setup-the-numcolumns-and-column-width-and-row-height-of-gridview-at-runtime