Bitmap图片加圆角效果
/** * 处理图片的工具类. * */public class ImageTools {/***//** * 图片去色,返回灰度图片 * @param bmpOriginal 传入的图片 * @return 去色后的图片*/public static Bitmap toGrayscale(Bitmap bmpOriginal) {int width, height; height = bmpOriginal.getHeight(); width = bmpOriginal.getWidth(); Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); Canvas c = new Canvas(bmpGrayscale); Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(0); ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm); paint.setColorFilter(f); c.drawBitmap(bmpOriginal, 0, 0, paint);return bmpGrayscale; }/***//** * 去色同时加圆角 * @param bmpOriginal 原图 * @param pixels 圆角弧度 * @return 修改后的图片*/public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {return toRoundCorner(toGrayscale(bmpOriginal), pixels); }/***//** * 把图片变成圆角 * @param bitmap 需要修改的图片 * @param pixels 圆角的弧度 * @return 圆角图片*/public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap .getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());final RectF rectF = new RectF(rect);final float roundPx = pixels; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint);return output; }/***//** * 使圆角功能支持BitampDrawable * @param bitmapDrawable * @param pixels * @return*/public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable, int pixels) { Bitmap bitmap = bitmapDrawable.getBitmap(); bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));return bitmapDrawable; } } 本文转自java豆子博客园博客，原文链接：http://www.cnblogs.com/error404/archive/2011/11/07/2239370.html，如需转载请自行联系原作者
