GridView 子项长度和宽度一样

下面是gridview 控件，每行放置四个,因此用宽度除4. 下面展现出来的的界面就显的比较美观。

public class HotSearchAdapter extends BaseAdapter {
	private LayoutInflater inflater;
	private List<App> infos;
	private Context context;

	public HotSearchAdapter(Context context, List<App> infos) {
		super();
		this.infos = infos;
		this.context = context;
		this.inflater = LayoutInflater.from(context);
		initWin();
	}

	@Override
	public int getCount() {
		if (infos != null && infos.size() > 0) {
			return infos.size();
		}
		return 0;
	}

	@Override
	public Object getItem(int position) {
		if (infos != null && infos.size() > 0) {
			return infos.get(position);
		}
		return null;
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		DataHolder holder;
		if (convertView == null) {
			convertView = inflater.inflate(R.layout.hot_search_gv_item, null);
			holder = new DataHolder();
			holder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image);

			convertView.setTag(holder);
		} else {
			holder = (DataHolder) convertView.getTag();
		}

		App mApp = infos.get(position);

		int pad = (int) (2*density);
		convertView.setPadding(pad, pad, pad, pad);
		convertView.setLayoutParams(new AbsListView.LayoutParams(widthPixels/4,widthPixels/4));
		return convertView;
	}

	public final class DataHolder {
		public ImageView iv_image;
	}

	private void initWin(){
		WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
		DisplayMetrics metrics = new DisplayMetrics();
		manager.getDefaultDisplay().getMetrics(metrics);
		density = metrics.density;
		widthPixels = metrics.widthPixels;
	}

	private float density;
	private int widthPixels;
}