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  • 圆角头像的实现

    图片处理类:


    public class ImageHelper {
        /**
         * 转换图片成圆形
         * @param bitmap 传入Bitmap对象
         * @return
         */
        public static 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;
                        top = 0;
                        bottom = width;
                        left = 0;
                        right = 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 int color = 0xff424242;
                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 );
                
                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, src, dst, paint);
                return output;
        }
       
    }
    


    在Activity中调用:


        /* 将头像转为圆形 */
         Resources res = getResources();
         Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.head);
         head.setImageBitmap(ImageHelper.toRoundBitmap(bmp));



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  • 原文地址:https://www.cnblogs.com/bbsno1/p/3268578.html
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