Android 指定角的圆角图片处理

 import android.graphics.Bitmap;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.graphics.PorterDuffXfermode;  import android.graphics.Rect;  import android.graphics.RectF;  import android.graphics.Bitmap.Config;  import android.graphics.PorterDuff.Mode;    /**   * @author :   * @email     * @date   : 2012-11-8   * @desc   :    */  public class BitmapFillet {     public static final int ALL = 347120;      public static final int TOP = 547120;      public static final int LEFT = 647120;      public static final int RIGHT = 747120;      public static final int BOTTOM = 847120;            /**       *        * 指定图片的切边，对图片进行圆角处理       * @param type 具体参见：{@link BitmapFillet.ALL} , {@link BitmapFillet.TOP} ,        *     {@link BitmapFillet.LEFT} , {@link BitmapFillet.RIGHT} , {@link BitmapFillet.BOTTOM}       * @param bitmap 需要被切圆角的图片       * @param roundPx 要切的像素大小       * @return       *       */      public static Bitmap fillet(int type,Bitmap bitmap,int roundPx) {          try {           // 其原理就是：先建立一个与图片大小相同的透明的Bitmap画板           // 然后在画板上画出一个想要的形状的区域。           // 最后把源图片帖上。           final int width = bitmap.getWidth();           final int height = bitmap.getHeight();                         Bitmap paintingBoard = Bitmap.createBitmap(width,height, Config.ARGB_8888);              Canvas canvas = new Canvas(paintingBoard);              canvas.drawARGB(Color.TRANSPARENT, Color.TRANSPARENT, Color.TRANSPARENT, Color.TRANSPARENT);                            final Paint paint = new Paint();              paint.setAntiAlias(true);              paint.setColor(Color.BLACK);                               if( TOP == type ){               clipTop(canvas,paint,roundPx,width,height);              }else if( LEFT == type ){                clipLeft(canvas,paint,roundPx,width,height);              }else if( RIGHT == type ){               clipRight(canvas,paint,roundPx,width,height);              }else if( BOTTOM == type ){               clipBottom(canvas,paint,roundPx,width,height);              }else{               clipAll(canvas,paint,roundPx,width,height);              }                            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));               //帖子图              final Rect src = new Rect(0, 0, width, height);              final Rect dst = src;              canvas.drawBitmap(bitmap, src, dst, paint);                 return paintingBoard;          } catch (Exception exp) {                      return bitmap;          }      }            private static void clipLeft(final Canvas canvas,final Paint paint,int offset,int width,int height){          final Rect block = new Rect(offset,0,width,height);          canvas.drawRect(block, paint);          final RectF rectF = new RectF(0, 0, offset * 2 , height);          canvas.drawRoundRect(rectF, offset, offset, paint);      }            private static void clipRight(final Canvas canvas,final Paint paint,int offset,int width,int height){          final Rect block = new Rect(0, 0, width-offset, height);          canvas.drawRect(block, paint);          final RectF rectF = new RectF(width - offset * 2, 0, width , height);          canvas.drawRoundRect(rectF, offset, offset, paint);      }            private static void clipTop(final Canvas canvas,final Paint paint,int offset,int width,int height){          final Rect block = new Rect(0, offset, width, height);          canvas.drawRect(block, paint);          final RectF rectF = new RectF(0, 0, width , offset * 2);          canvas.drawRoundRect(rectF, offset, offset, paint);      }            private static void clipBottom(final Canvas canvas,final Paint paint,int offset,int width,int height){          final Rect block = new Rect(0, 0, width, height - offset);          canvas.drawRect(block, paint);          final RectF rectF = new RectF(0, height - offset * 2 , width , height);          canvas.drawRoundRect(rectF, offset, offset, paint);      }            private static void clipAll(final Canvas canvas,final Paint paint,int offset,int width,int height){       final RectF rectF = new RectF(0, 0, width , height);          canvas.drawRoundRect(rectF, offset, offset, paint);      }  }