Android图片处理

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将Bitmap图片转换为圆形，正方形，base64,并将base64转换为Bitmap，压缩图片

public class BitmapAndBase64 {
    /**
     * 图片设置为圆形
     * @param bitmap
     * @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;
    }

    /**
     * 图片设置为正方形
     * @param bitmap
     * @return
     */
    public static Bitmap ImageCrop(Bitmap bitmap) {
        int w = bitmap.getWidth(); // 得到图片的宽，高
        int h = bitmap.getHeight();

        int wh = w > h ? h : w;// 裁切后所取的正方形区域边长

        int retX = w > h ? (w - h) / 2 : 0;//基于原图，取正方形左上角x坐标
        int retY = w > h ? 0 : (h - w) / 2;

        //下面这句是关键
        return Bitmap.createBitmap(bitmap, retX, retY, wh, wh, null, false);
    }

    /**
     * bitmap转换为Base64
     * @param bitmap
     * @return
     */
    public static String bitmapToBase64(Bitmap bitmap) {

        String result = null;
        ByteArrayOutputStream baos = null;
        try {
            if (bitmap != null) {
                baos = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);

                baos.flush();
                baos.close();

                byte[] bitmapBytes = baos.toByteArray();
                result = Base64.encodeToString(bitmapBytes, Base64.DEFAULT);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (baos != null) {
                    baos.flush();
                    baos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }
    /**
     * base64转为bitmap
     *
     * @param base64Data
     * @return
     */
    public static Bitmap base64ToBitmap(String base64Data) {
        Bitmap bitmap = null;
        try {
            byte[]bitmapArray;
            bitmapArray=Base64.decode(base64Data, Base64.DEFAULT);
            bitmap=BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length);
        } catch (Exception e) {
            e.printStackTrace();
        }
//        try {
//            byte[] bitmapArray;
//            bitmapArray = base64Data.getBytes("UTF-8");
//            YuvImage yuvimage = new YuvImage(bitmapArray, ImageFormat.NV21, 20,
//                    20, null); // 20、20分别是图的宽度与高度
//            ByteArrayOutputStream baos = new ByteArrayOutputStream();
//            // 80--JPG图片的质量[0-100],100最高
//            yuvimage.compressToJpeg(new Rect(0, 0, 20, 20), 80, baos);
//            byte[] jdata = baos.toByteArray();
//            bitmap = BitmapFactory.decodeByteArray(jdata, 0, jdata.length);
//            baos.close();
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
        return bitmap;
    }

    //图片压缩
    public static Bitmap compressImage(Bitmap image) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
        int options = 90;
        while (baos.toByteArray().length / 1024 > 100) { // 循环判断如果压缩后图片是否大于100kb,大于继续压缩
            baos.reset(); // 重置baos即清空baos
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中
            options -= 10;// 每次都减少10
        }
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片
        return bitmap;
    }
}