Bitmap实现圆，保存Bitmap到文件

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/**     * 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;            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, Bitmap.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);// 设置画笔无锯齿        canvas.drawARGB(0, 0, 0, 0); // 填充整个Canvas        paint.setColor(color);        // 以下有两种方法画圆,drawRounRect和drawCircle        // canvas.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(PorterDuff.Mode.SRC_IN));// 设置两张图片相交时的模式,参考http://trylovecatch.iteye.com/blog/1189452        canvas.drawBitmap(bitmap, src, dst, paint); //以Mode.SRC_IN模式合并bitmap和已经draw了的Circle        return output;    }    /**     * 保存Bitmap到文件中     * @param bitmap     * @param filePath     */    public static void saveBitmap(Bitmap bitmap, String filePath) {        File f = new File(filePath);        FileOutputStream fos = null;        try {            f.createNewFile();            fos = new FileOutputStream(f);            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);            fos.flush();        } catch (Exception e) {            e.printStackTrace();        } finally {            if (fos != null) {                try {                    fos.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }

<pre name="code" class="java">/**     * 将图片按自己的要求缩放     * @param bitmap     * @param newWidth     * @param newHeight     * @return     */    public static Bitmap resizeBitmap(Bitmap bitmap,int newWidth,int newHeight){        int width = bitmap.getWidth();        int height = bitmap.getHeight();        float scaleW  = ((float)newWidth)/width;        float scaleH = ((float)newHeight)/height;        Matrix matrix = new Matrix();        matrix.postScale(scaleW, scaleH);        return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix,true);    }

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