Android Bitmap 改变大小

/**
     * Returns a Bitmap representing the thumbnail of the specified Bitmap.
     * The size of the thumbnail is defined by the dimension
     * android.R.dimen.launcher_application_icon_size.
     *
     * This method is not thread-safe and should be invoked on the UI thread only.
     *
     * @param bitmap The bitmap to get a thumbnail of.
     * @param context The application's context.
     *
     * @return A thumbnail for the specified bitmap or the bitmap itself if the
     *         thumbnail could not be created.
     */
    public static Bitmap createBitmapThumbnail(Bitmap bitmap, Context context)
    {
         if(FusionField.iconWidth == -1&&(FusionField.screenWidth == 800 && FusionField.screenHeight == 480)){
                FusionField.iconWidth = 80;
                FusionField.iconHeight = 98;

        }
        else if (FusionField.iconWidth == -1)
        {
                FusionField.iconWidth = 60;
                FusionField.iconHeight = 82;
        }

        final int bitmapWidth = bitmap.getWidth();
        final int bitmapHeight = bitmap.getHeight();

        Log.e("dean xiang", "" + bitmapWidth + ":" + bitmapHeight);
        if (FusionField.iconWidth > 0 && FusionField.iconHeight > 0)
        {

            final Bitmap.Config c = Bitmap.Config.ARGB_8888;
            final Bitmap thumb = Bitmap
                    .createBitmap(FusionField.iconWidth, FusionField.iconHeight, c);
            final Canvas canvas = sCanvas;
            final Paint paint = sPaint;

            canvas.setBitmap(thumb);
            paint.setDither(false);
            paint.setFilterBitmap(true);
            //          int offsetX = Math.abs(sIconWidth - bitmapWidth) / 2;
            //          int offsetY = Math.abs(sIconHeight - bitmapHeight) / 2;
            //
            //          sBounds.set(offsetX, offsetY, bitmapWidth + offsetX,
            //                  bitmapHeight + offsetY);
            //          sOldBounds.set(0, 0, bitmapWidth, bitmapHeight);
            //          canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint);

            sBounds.set(0, 0, FusionField.iconWidth, FusionField.iconHeight);
            sOldBounds.set(0, 0, bitmapWidth, bitmapHeight);
            canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint);
            return thumb;
        }

        return bitmap;
    }