如何将“画布”设置为非透明图像？

Question

I have a bitmap of size 400*100. Now i want to increase the bitmap size to 400*200 with empty white space on bottom. i tried the below code, but its creating transparent space, not white space.

=== My Code ===

// oldBitMap size are 400(width) and 100(height)

Bitmap newBitmap = Bitmap.createBitmap(400, 200, oldBitMap.getConfig());

Canvas canvas = new Canvas(newBitmap);

canvas.drawColor(Color.WHITE);

canvas.drawBitmap(oldBitMap, 0, 0, null);

Help Please....

Answer 1

Try changing the first line to:

Bitmap newBitmap = Bitmap.createBitmap(400, 200, Bitmap.Config.ARGB_8888);

The only thing I can come up with is the original bitmap having a bad config.