关于listview中图片切圆,网络请求数据,并Gson解析后得到list

public Bitmap toRoundBitmap(Bitmap bitmap) {
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		float roundPx;
		float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;
		if (width <= height) {
			roundPx = width / 2;

			left = 0;
			top = 0;
			right = width;
			bottom = width;

			height = width;

			dst_left = 0;
			dst_top = 0;
			dst_right = width;
			dst_bottom = width;
		} else {
			roundPx = height / 2;

			float clip = (width - height) / 2;

			left = clip;
			right = width - clip;
			top = 0;
			bottom = height;
			width = height;

			dst_left = 0;
			dst_top = 0;
			dst_right = height;
			dst_bottom = height;
		}

		Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);
		Canvas canvas = new Canvas(output);

		final Paint paint = new Paint();
		final Rect src = new Rect((int) left, (int) top, (int) right,
				(int) bottom);
		final Rect dst = new Rect((int) dst_left, (int) dst_top,
				(int) dst_right, (int) dst_bottom);
		final RectF rectF = new RectF(dst);

		paint.setAntiAlias(true);// 设置画笔无锯齿

		canvas.drawARGB(0, 0, 0, 0); // 填充整个Canvas

		// 以下有两种方法画圆,drawRounRect和drawCircle
		canvas.drawRoundRect(rectF, roundPx, roundPx, paint);// 画圆角矩形，第一个参数为图形显示区域，第二个参数和第三个参数分别是水平圆角半径和垂直圆角半径。
		// canvas.drawCircle(roundPx, roundPx, roundPx, paint);

		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));// 设置两张图片相交时的模式,参考http://trylovecatch.iteye.com/blog/1189452
		canvas.drawBitmap(bitmap, src, dst, paint); // 以Mode.SRC_IN模式合并bitmap和已经draw了的Circle

		return output;
	}

new Thread() {
			public void run() {
				HttpClient client = new DefaultHttpClient();
				HttpGet get = new HttpGet(url);
				try {
					HttpResponse res = client.execute(get);
					if (res.getStatusLine().getStatusCode() == 200) {
						String str = EntityUtils.toString(res.getEntity());
						Gson g = new Gson();
						Shop_list show_list = g.fromJson(str, Shop_list.class);

						list = show_list.getData().getContent();
						for (int i = 0; i < list.size(); i++) {
						String url = "http://www.07snow.com/public/goods_image/"
								+ list.get(i).getGoods_imgs();
						URL u = new URL(url);
						InputStream is = u.openStream();
						Bitmap b1 = BitmapFactory.decodeStream(is);
						Bitmap b2 = toRoundBitmap(b1);
						
							list.get(i).setBit(b2);
						}
						list1.addAll(list);
						handler.sendMessage(handler.obtainMessage(1));
					}
				} catch (ClientProtocolException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			};
		}.start();