关于listview中图片切圆,网络请求数据,并Gson解析后得到list
切圆的方法:
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; }
在数据请求的线程中进行操作:
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();
在handler主线程中调用