圆角和圆形ImageView

※效果

※代码

/** * 转换图片成圆形 *  * @param bitmap *            传入Bitmap对象 * @return */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drawCirclecanvas.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/1189452canvas.drawBitmap(bitmap, src, dst, paint); // 以Mode.SRC_IN模式合并bitmap和已经draw了的Circlereturn output;}/** * 圆角图片 * @param bitmap * @return */public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {      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 = 12;          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;     }  /*** * 设置图片倒影 * @param originalBitmap * @return */private Bitmap createReflectedImage(Bitmap originalBitmap) {          // 图片与倒影间隔距离          final int reflectionGap = 4;                    // 图片的宽度          int width = originalBitmap.getWidth();          // 图片的高度          int height = originalBitmap.getHeight();                    Matrix matrix = new Matrix();          // 图片缩放，x轴变为原来的1倍，y轴为-1倍,实现图片的反转          matrix.preScale(1, -1);          // 创建反转后的图片Bitmap对象，图片高是原图的一半。          Bitmap reflectionBitmap = Bitmap.createBitmap(originalBitmap, 0,                  height / 2, width, height / 2, matrix, false);          // 创建标准的Bitmap对象，宽和原图一致，高是原图的1.5倍。          Bitmap withReflectionBitmap = Bitmap.createBitmap(width, (height                  + height / 2 + reflectionGap), Config.ARGB_8888);            // 构造函数传入Bitmap对象，为了在图片上画图          Canvas canvas = new Canvas(withReflectionBitmap);          // 画原始图片          canvas.drawBitmap(originalBitmap, 0, 0, null);            // 画间隔矩形          Paint defaultPaint = new Paint();          canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);            // 画倒影图片          canvas.drawBitmap(reflectionBitmap, 0, height + reflectionGap, null);            // 实现倒影效果          Paint paint = new Paint();          LinearGradient shader = new LinearGradient(0, originalBitmap.getHeight(),                   0, withReflectionBitmap.getHeight(), 0x70ffffff, 0x00ffffff,                  TileMode.MIRROR);          paint.setShader(shader);          paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));            // 覆盖效果          canvas.drawRect(0, height, width, withReflectionBitmap.getHeight(), paint);            return withReflectionBitmap;      }  

※Demo下载

http://download.csdn.net/detail/u010785585/7690145