图片的圆角和颜色处理

忘了转载自哪里，从以前的文档里找出来的，原作者看到莫怪莫怪

图片本身加上圆角

Bitmap myCoolBitmap = ... ; // <-- Your bitmap you want rounded int w = myCoolBitmap.getWidth(), h = myCoolBitmap.getHeight(); Bitmap rounder = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(rounder);   Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG); xferPaint.setColor(Color.RED); canvas.drawRoundRect(new RectF(0,0,w,h), 20.0f, 20.0f, xferPaint); xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); canvas.drawBitmap(myCoolBitmap, 0,0, null); canvas.drawBitmap(rounder, 0, 0, xferPaint); 或者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;}

将彩色图转换为灰度图 

/**          * 将彩色图转换为灰度图          * @param img 位图          * <a href="\"http://www.eoeandroid.com/home.php?mod=space&uid=7300\"" target="\"_blank\"">@return</a>  返回转换好的位图          */        public Bitmap convertGreyImg(Bitmap img) {           int width = img.getWidth();      //获取位图的宽           int height = img.getHeight();    //获取位图的高                        int []pixels = new int[width * height];  //通过位图的大小创建像素点数组                        img.getPixels(pixels, 0, width, 0, 0, width, height);           int alpha = 0xFF << 24;              for(int i = 0; i < height; i++)  {             for(int j = 0; j < width; j++) {               int grey = pixels[width * i + j];                                int red = ((grey    & 0x00FF0000 ) >> 16);               int green = ((grey & 0x0000FF00) >> 8);               int blue = (grey & 0x000000FF);                                grey = (int)((float) red * 0.3 + (float)green * 0.59 + (float)blue * 0.11);               grey = alpha | (grey << 16) | (grey << 8) | grey;               pixels[width * i + j] = grey;             }           }           Bitmap result = Bitmap.createBitmap(width, height, Config.RGB_565);           result.setPixels(pixels, 0, width, 0, 0, width, height);           return result;         } 

记录一下，方便自己查阅