分享一个Android图片转换类 1. Bitmap去色,转换为黑白的灰度图, 2. Bitmap图片加圆角效果
今天下午弄了半天实现了图片变黑白和圆角效果,发出来大家共享一下~
其中思路主要来自www.stackoverflow.com不多说,直接贴代码,欢迎大家交流自己的方法~
1/** *//**
2 * 处理图片的工具类.
3 *
4 */
5public class ImageTools {
6
7 /** *//**
8 * 图片去色,返回灰度图片
9 * @param bmpOriginal 传入的图片
10 * @return 去色后的图片
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 * 去色同时加圆角
31 * @param bmpOriginal 原图
32 * @param pixels 圆角弧度
33 * @return 修改后的图片
34 */
35 public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {
36 return toRoundCorner(toGrayscale(bmpOriginal), pixels);
37 }
38
39 /** *//**
40 * 把图片变成圆角
41 * @param bitmap 需要修改的图片
42 * @param pixels 圆角的弧度
43 * @return 圆角图片
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 * 使圆角功能支持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}
补充：移动开发 , Android ,
