压缩图片到指定的宽度

 /**
     * 压缩图片到指定宽度
     * 的大小
     * @param bmp
     * @param getWidthImae
     * @return
     */
    public static Bitmap sizeCompress(Bitmap bmp,float getWidthImae) {

        Bitmap scaledBitmap = null;
        if(bmp!=null){
            // 尺寸压缩倍数,值越大，图片尺寸越小
            int w = bmp.getWidth();
            int h = bmp.getHeight();
            float ratio = w/getWidthImae;
            // 压缩Bitmap到对应尺寸
            Bitmap result = Bitmap.createBitmap((int)(w/ratio), (int)(h/ratio), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(result);
            Rect rect = new Rect(0, 0, (int)(w/ratio), (int)(h/ratio));
            canvas.drawBitmap(bmp, null, rect, null);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            // 把压缩后的数据存放到baos中
            result.compress(Bitmap.CompressFormat.JPEG, 100, baos);
            ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
            scaledBitmap = BitmapFactory.decodeStream(isBm);
        }
        return scaledBitmap;
    }