图片形状圆角_移动开发_编程开发_程序员俱乐部

一定要先转换成PNG格式的否则会不透明


 1     /**
 2      * 方形转换图片成圆形
 3      * 
 4      * @param bitmap
 5      *            传入Bitmap对象
 6      * @return
 7      */
 8     public Bitmap toRoundBitmap(Bitmap bitmap) {
 9         int width = bitmap.getWidth();
10         int height = bitmap.getHeight();
11         float roundPx;
12         float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;
13         if (width <= height) {
14             roundPx = width / 2;
15             left = 0;
16             top = 0;
17             right = width;
18             bottom = width;
19             height = width;
20             dst_left = 0;
21             dst_top = 0;
22             dst_right = width;
23             dst_bottom = width;
24         } else {
25             roundPx = height / 2;
26             float clip = (width - height) / 2;
27             left = clip;
28             right = width - clip;
29             top = 0;
30             bottom = height;
31             width = height;
32             dst_left = 0;
33             dst_top = 0;
34             dst_right = height;
35             dst_bottom = height;
36         }
37 
38         Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);
39         Canvas canvas = new Canvas(output);
40 
41         final int color = 0xff424242;
42         final Paint paint = new Paint();
43         final Rect src = new Rect((int) left, (int) top, (int) right,
44                 (int) bottom);
45         final Rect dst = new Rect((int) dst_left, (int) dst_top,
46                 (int) dst_right, (int) dst_bottom);
47         final RectF rectF = new RectF(dst);
48 
49         paint.setAntiAlias(true);// 设置画笔无锯齿
50 
51         canvas.drawARGB(0, 0, 0, 0); // 填充整个Canvas
52         paint.setColor(color);
53 
54         // 以下有两种方法画圆,drawRounRect和drawCircle
55         // canvas.drawRoundRect(rectF, roundPx, roundPx, paint);//
56         // 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。
57         canvas.drawCircle(roundPx, roundPx, roundPx, paint);
58 
59         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
60         canvas.drawBitmap(bitmap, src, dst, paint); // 以Mode.SRC_IN模式合并bitmap和已经draw了的Circle
61 
62         return output;
63     }

 1 // 矩形将图片的四角圆化
 2     public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
 3         Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
 4                 bitmap.getHeight(), Config.ARGB_8888);
 5         // 得到画布
 6         Canvas canvas = new Canvas(output);
 7         // 将画布的四角圆化
 8         final int color = Color.RED;
 9         final Paint paint = new Paint();
10         // 得到与图像相同大小的区域 由构造的四个值决定区域的位置以及大小
11         final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
12         final RectF rectF = new RectF(rect);
13         // 值越大角度越明显
14         final float roundPx = 30;
15         paint.setAntiAlias(true);
16         canvas.drawARGB(0, 0, 0, 0);
17         paint.setColor(color);
18         // drawRoundRect的第2,3个参数一样则画的是正圆的一角，如果数值不同则是椭圆的一角
19         canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
20         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
21         canvas.drawBitmap(bitmap, rect, rect, paint);
22         return output;
23     }