今天下午弄了半天實現了圖片變黑白和圓角效果,發出來大家共享一下~
其中思路主要來自www.stackoverflow.com
不多說,直接貼代碼,歡迎大家交流自己的方法~
1
/** *//**
2
* 處理圖片的工具類.
3 *
4
*/
5public class ImageTools 
{
6
7
/** *//**
8 * 圖片去色,返回灰度圖片
9 * @param bmpOriginal 傳入的圖片
10 * @return 去色后的圖片
11
*/
12 public static Bitmap toGrayscale(Bitmap bmpOriginal) {
13 int width, height;
14 height = bmpOriginal.getHeight();
15 width = bmpOriginal.getWidth();
16
17 Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
18 Canvas c = new Canvas(bmpGrayscale);
19 Paint paint = new Paint();
20 ColorMatrix cm = new ColorMatrix();
21 cm.setSaturation(0);
22 ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
23 paint.setColorFilter(f);
24 c.drawBitmap(bmpOriginal, 0, 0, paint);
25 return bmpGrayscale;
26 }
27
28
29 /** *//**
30 * 去色同時加圓角
31 * @param bmpOriginal 原圖
32 * @param pixels 圓角弧度
33 * @return 修改后的圖片
34 */
35 public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {
36 return toRoundCorner(toGrayscale(bmpOriginal), pixels);
37 }
38
39 /** *//**
40 * 把圖片變成圓角
41 * @param bitmap 需要修改的圖片
42 * @param pixels 圓角的弧度
43 * @return 圓角圖片
44 */
45 public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
46
47 Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
48 .getHeight(), Config.ARGB_8888);
49 Canvas canvas = new Canvas(output);
50
51 final int color = 0xff424242;
52 final Paint paint = new Paint();
53 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
54 final RectF rectF = new RectF(rect);
55 final float roundPx = pixels;
56
57 paint.setAntiAlias(true);
58 canvas.drawARGB(0, 0, 0, 0);
59 paint.setColor(color);
60 canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
61
62 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
63 canvas.drawBitmap(bitmap, rect, rect, paint);
64
65 return output;
66 }
67
68
69 /** *//**
70 * 使圓角功能支持BitampDrawable
71 * @param bitmapDrawable
72 * @param pixels
73 * @return
74 */
75 public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable, int pixels) {
76 Bitmap bitmap = bitmapDrawable.getBitmap();
77 bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));
78 return bitmapDrawable;
79 }
80}
posted on 2011-03-23 15:07
ApolloDeng 閱讀(6568)
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