安卓 bitmap生成缩略图

    /**
     * 生成缩略图
     * 缩略图是将原图等比压缩，压缩后宽、高中较小的一个等于198像素  
     */
    private Bitmap getThumb(String path){final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);
        int reqWidth, reqHeight, width=options.outWidth, height=options.outHeight;
        if (width > height){reqWidth = 198;
            reqHeight = (reqWidth * height)/width;
        }else{reqHeight = 198;
            reqWidth = (width * reqHeight)/height;
        }int inSampleSize = 1;
        if (height > reqHeight || width > reqWidth) {final int halfHeight = height / 2;
            final int halfWidth = width / 2;
            while ((halfHeight / inSampleSize) > reqHeight&& (halfWidth / inSampleSize) > reqWidth) {inSampleSize *= 2;
            }}try{options.inSampleSize = inSampleSize;
            options.inJustDecodeBounds = false;
            Matrix mat = new Matrix();
            Bitmap bitmap = BitmapFactory.decodeFile(path, options);
            ExifInterface ei =  new ExifInterface(path);
            int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
            switch(orientation) {case ExifInterface.ORIENTATION_ROTATE_90:mat.postRotate(90);
                    break;
                case ExifInterface.ORIENTATION_ROTATE_180:mat.postRotate(180);
                    break;
            }
//            Log.e("test","bitmap.getWidth():"+bitmap.getWidth()+",,bitmap.getHeight():"+bitmap.getHeight());
            return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), mat, true);
        }catch (IOException e){return null;
        }}

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